2013年3月12日星期二

Cisco Network Troubleshooting for Beginners



As a Network Engineer, your primary goal is to make sure that your network equipment is operating properly at all times. But we all know that any equipment can break down. The reasons for this could be software inconsistencies, hardware malfunctions, maybe even environmental hazards.

Under such unpredictable conditions, your responsibility is to identify and isolate the cause of the malfunction and correct it as soon as you can. That’s why it is extremely helpful to know some specific techniques that have been proven to be crucial and essential in the networking world.

In today’s article I’ll present the most important commands that you will definitely find helpful and even mandatory throughout your networking career and specifically during network troubleshooting situations. The commands I am talking about, and which are truly invaluable, are:
  • Ping
  • Traceroute
  • Telnet
  • Show interfaces
  • Show ip interface
  • Show ip route
  • Show running-config
  • Show startup-config

The Ping Utility
The PING command operates on the Network layer and uses the services of the ICMP protocol. It is the first command that you should use at the beginning of your troubleshooting process.

With PING you can test whether a remote host is alive by transmitting echo request messages and receive echo replies from the specific host. Keep in mind that even if a host is alive, it does not mean that it is functioning properly that is why PING is used at the beginning of your investigation and is the best command to start with.

PING command has quite a lot of options from which you can greatly benefit. For example, you can choose to PING with different network protocols. Moreover, you are able to set the exact number of PING requests to be transmitted. You can also choose the length of data carried within the echo request packet (provided in bytes) and also specify whether fragmentation of this packet is allowed or not during transmission. The last two options in cooperation can be used to identify the lowest MTU value existing in the communication path.

On Cisco devices the simpler way to use the PING utility is to issue the command PING along with the IP address of the remote device:


For more advanced features, simply issue the PING command and follow the prompts from that point on:

The Traceroute Command
The TRACEROUTE command traces the end-to-end path a packet takes though an internetwork. Similarly with PING, it uses the ICMP protocol with TTL timeouts to perform its operation..

This command is very useful in identifying potential link bottlenecks throughout the transmission path. Here is a sample output of the TRACEROUTE command:

The Telnet Command
Use the telnet command to verify TCP stack and application layer software between source and destination stations. Of course, to be able to telnet on a Cisco device, the latter needs to be already configured to accept telnet connections. To use TELNET just issue the telnet command along with the IP address or hostname of the remote station:

The Show Interfaces Command
The show interfaces command presents all the available interfaces that can be configured on your Cisco device. You can explicitly use this command to show only details on a single interface by issuing the interfaces name after the show interfaces command. This command is very useful because it can reveal layer 1 and layer 2 problems. Moreover, this command provides details regarding the hardware address (MAC), IP address, encapsulation method and statistics concerning erroneous conditions on the specific interface. Examine the output of the show interface fastethernet 0:

The first line of the show interface command is the most important one. The first parameter refers to the physical layer, thereforein this case FastEthernet 0 is up and operating. The second part of the line refers to the Data Link Layer; therefore here line protocol is up means that we have layer 2 connectivity as well. There are four possible outputs that you may come across:
  • FastEthernet0 is up, line protocol is up: Both the Physical and Data Link layers on the interface are functioning correctly.
  • FastEthernet0 is down, line protocol is down: This output indicates a physical interface problem. For example, the cable on this interface or on the remote interface is disconnected.
  • FastEthernet0 is up, line protocol is down: In this case, Physical layer is operational. The line protocol being down indicates a clocking or framing problem. Probable reasons for this are encapsulation and clock rate mismatches.
  • Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command.

The Show IP Interface Command
The show ip interface command will provide details regarding layer 3 configuration on the interfaces. Using this command you can see the IP address and mask configured on a given interface, whether an access list is applied on the interface as well as basic
IP information.


The Show IP Route Command
Use the show ip route command to find detailed information regarding the routes configured on the router. Keep in mind that the router can only route packets to the networks listed in its routing table. It is possible that a router cannot reach a network you manually configured therefore, that specific route is removed from its table and that is why you should use the show running configuration command in conjunction with show ip route to spot possible inconsistencies.


Show Running-Config and Show Startup-Config Commands
Issue the show running configuration command to find out the whole configuration your Cisco devices use while operating. By looking at the details of your devices, configuration can help you identify the cause to your problem. Use the show startup configuration command to see the configuration commands that will be loaded to your device the next time it reboots and compare it with your running configuration in order to identify possible unconformities.


In the End … Follow Your Instincts
Isolating a network malfunction is not an easy task. In many cases you need to swim into really deep waters in order to identify the error. Meaning, that you will probably need to get into the bits and bytes in order to locate the error.

A lot of network monitor tools are available to help you during these difficult tasks. And although there’s a lot you can do, remember to never lose your courage; have patience and follow your gut.

Sometimes the problem that you’re searching for will be right in front of you and will slip out of your hands, just when you think you have it. So be persistent, be patient and remember: you will win the battle!

Be prepared; in order to fight well, you should be armed well. So get to know your device very well, know how it operates, and know how to use the basic troubleshooting commands – that you just learned – so that you can identify the problem, or at least estimate where the problem might be. Good luck!

More Networking Info and Tips:

2012年10月11日星期四

What Router-switch.com Prepared for Its 10th Anniversary?


If you wanna know more about the activities hold at router-switch.com, you can visit the related topics: Big Discount for the Popular Cisco Items


How the Router-switch.com Became the World’s Leading Cisco Supplier?
During the past ten years, from 2002 to 2012, router-switch.com has grown up into a global leading Cisco supplier. Indeed, it has experienced several vital moment. Here let’s share some router-switch.com’s big events:
2002, Router-switch.com was founded.
2003, Router-switch.com has experienced a rapid development.
2004, CCIE technical support team was built.
2005, The sales volume maintains 70% growth per year.
2006, Staff in company increased to 20.
2007, Router-switch.com established its marketing department. It attained its reputation in providing timely information of Cisco for clients and Cisco users.
2008, Router-switch.com adopted necessary advanced management tools to improve its service for clients.
2009, Router-switch.com upgraded warehouses in Hongkong and Mainland China. Its inventory is worth over $5 million.
2010, The sales of Router-switch.com have zoomed to $ 30 million.
2011, Router-switch.com released the new version to update service. It supplies free CCIE support. Social network platforms were opened to communicate with customers and clients well.
2012, New Office of router-switch.com landed in US to offer professional local service.

Nowadays, router-switch.com is becoming the world’s largest Cisco reseller online.  It believes that router-switch.com will bemore professional, more reliable and stronger with your support.
Note:A letter from CEO of router-switch.com to thank its customers and sharetheir progress.


More about Router-switch.com:
Router-switch.com, also called YejianTechnologies Co., Ltd, is the worldwide leader in delivering new, used, refurbished Cisco hardware, including Cisco routers, Cisco switches, firewall security, Cisco IP Phones VoIP, wireless AP, Cisco modules & cards, memory, and optical cables, SFP, GBIC, XENPK , etc. It carries over $5 million in inventory of Ciscohardware and Cisco equipment that can meet SOHO, small, midsized and large businesses of all sizes. Also Router-Switch.com owns more than 8,000 customers worldwide, not only because of its original Cisco products with reliable quality and competitive price, but also due to professionalservice, huge inventory, flexible payment and shipment. More information about router-switch.com can be found at http://www.router-switch.com/. For ongoing Cisco info, please go to
Blog.router-switch.com---News, tutorials, tips, info & thoughts on Developments in the Cisco, Cisco network, IT, Software & Network Hardware Industry
.


2012年7月31日星期二

Hardware Firewalls& Software Firewalls


Firewalls can be Either Cisco Hardware or Software.The ideal firewall configuration will consist of both. In addition to limiting access to your computer and network, a firewall is also useful for allowing remote access to a private network through secure authentication certificates and logins.

While many people do not completely understand the importance and necessity of a firewall, or consider it to be a product for businesses only, if your network or computer has access to the outside world via the Internet then you need have a firewall to protect your network, individual computer and data therein.

Hardware firewalls can be purchased as a stand-alone product but more recently hardware firewalls are typically found in broadband routers, and should be considered an important part of your system and network set-up, especially for anyone on a broadband connection. Hardware firewalls can be effective with little or no configuration, and they can protect every machine on a local network. Most hardware firewalls will have a minimum of four network ports to connect other computers, but for larger networks, business networking firewall solutions are available.

A hardware firewall uses packet filtering to examine the header of a packet to determine its source and destination. This information is compared to a set of predefined or user-created rules that determine whether the packet is to be forwarded or dropped.

As with any electronic equipment, a computer user with general computer knowledge can plug in a cisco firewall, adjust a few settings and have it work. To ensure that your firewall is configured for optimal security and protect however, consumers will no doubt need to learn the specific features of their hardware firewall, how to enable them, and how to test the firewall to ensure its doing a good job of protecting your network.

Not all firewalls are created equal, and to this end it is important to read the manual and documentation that comes with your product. Additionally the manufacturer's Web site will usually provide a knowledge base or FAQ to help you get started. If the terminology is a bit too tech-oriented, you can also use the Web opedia search to help you get a better understanding of some of the tech and computer terms you will encounter while setting up your hardware firewall.

To test your hardware firewall security, you can purchase third-party test software or search the Internet for a free online-based firewall testing service. Firewall testing is an important part of maintenance to ensure your system is always configured for optimal protection.

Software Firewalls
For individual home users, the most popular firewall choice is a software firewall. Software firewalls are installed on your computer (like any software) and you can customize it; allowing you some control over its function and protection features. A software firewall will protect your computer from outside attempts to control or gain access your computer, and, depending on your choice of software firewall, it could also provide protection against the most common Trojan programs or e-mail worms. Many software firewalls have user defined controls for setting up safe file and printer sharing and to block unsafe applications from running on your system. Additionally, software firewalls may also incorporate privacy controls, web filtering and more. The downside to software firewalls is that they will only protect the computer they are installed on, not a network, so each computer will need to have a software firewall installed on it.

Like hardware firewalls there is a vast number of software firewalls to choose from. To get started you may wish to read reviews of software firewalls and search out the product Web site to glean some information first. Because your software firewall will always be running on your computer, you should make note of the system resources it will require to run and any incompatibilities with your operating system. A good software firewall will run in the background on your system and use only a small amount of system resources. It is important to monitor a software firewall once installed and to download any updates available from the developer.

The differences between a software and hardware firewall are vast, and the best protection for your computer and network is to use both, as each offers different but much-needed security features and benefits. Updating your firewall and your operating system is essential to maintaining optimal protection, as is testing your firewall to ensure it is connected and working correctly.
read more:cisco securitycisco asa, cisco asa 5510

2012年7月11日星期三

What Cisco Switches Benefit Your Network?


Cisco delivers a comprehensive portfolio of switching solutions for Borderless Networks, data centers, and smaller businesses. These solutions are optimized for a wide range of industries, including service providers, financial services, and the public sector. There are all kinds of Cisco switches meet the needs of networks of all sizes, such as Cisco blade switches for Dell, HP, IBM, FSC, LAN switches-Access, LAN switches-Compact, LAN switches-Core, LAN switches-Small Business, Service Provider Switches–Aggregation/-Ethernet Access, etc.

What Cisco Switches Benefit Your Network?
Turn Your Network into a Strategic Asset
Cisco switching solutions are the cornerstone of the Borderless Network Architecture. Extensible platforms andintelligentservices combine to deliver extraordinary business value to networked organizations of all sizes and across all industries.

Find out how switching solutions and Borderless Networks can provide you with a significant return on your investment. Read the Forrester TEI Assessment and use the associated calculator to determine your potential savings.

Deliver a Positive User Experience
Today's users are mobile and visual. They are internal workers and external partners and customers. Regardless oflocation, application, or information stream, Cisco switching solutions deliver a consistent high-quality network experience to connected users. This increases end user productivity, satisfaction ratings, and business system interaction and returns.
Superior Access and Service Levels

In Cisco’s networked business world, rapid, reliable access to any resource anywhere, and at any time, is mandatory. Cisco switching solutions deliver maximum uptime, high throughput, rapid deployment, enhanced access, and automated operations. Cisco's expert design guidance and support services help you meet your advertised network performance.

Reduce Energy Costs and Resource Consumption
Cisco switching solutions offer a wide range of green IT options for sustainable benefits. These include:
  • Power-saving designs
  • StackPower technology
  • Optimized video and virtualization services
  • Extended service life

Cisco EnergyWise switching software extends energy management to both IT and business facilities (HVAC, lighting). Cisco EnergyWise can reduce your energy costs by up to 30 percent, while lowering greenhouse gas emissions and carbon footprint.

Accommodate Business and IT Shifts
Business processes and goals are always under pressure to improve. Cisco switching solutions allow you to act quickly on new business requirements.Scalable performance, integrated services, and flexible configurations offer continued secure, reliable, and simplified communications in times of change.

Implement Security and Compliance
Secure access is critical in a world where threats are ubiquitous. Cisco switching solutions are designed to lock down information, authorize user movements, and mitigate threats in many forms. VLANs, TrustSec, MACsec, firewall, intrusion prevention, and Control Plane Policing are just a few of the essential security capabilities in Cisco switches.

Deliver Superior Investment Protection
Cisco switching solutions as designed to serve your organization now and in the future. Scalable, service-rich Catalystand Nexus switches adapt to new IT and business requirements. Incremental upgrades can be performed using technologies as switch supervisors, service modules, StackWise, software-based services, and interface components that can be reused or easily replaced.

Featured Cisco Switches are widely used by different enterprises, organizations, campuses, business, and offices of all sizes
Campus LAN – Core/Distribution Switches
Scale network performance and reliability with industry- leading network services, integrated service modules, and validated design guides.

Cisco Catalyst 6500 Series Switches
  • Flagship Catalyst switching services platform for core-distribution deployments
  • Virtual Switching System bolsters availability and scales to 4-terabit capacity
  • Up to 160 gigabits per slot; 100 Gigabit Ethernet ready
  • Simplifies creation of separate logical networks with Easy Virtual Network (EVN)
  • Integrated services modules enhance security, manageability, and wireless control

Cisco Nexus 7000 Series Switches
  • Highest switching capacity; up to 550 Gigabits per slot, 15 terabits per chassis
  • Highest density 10 Gigabit Ethernet port aggregation; up to 512 ports per chassis
  • Advanced high availability; hitless In-Service Software Upgrade (ISSU)
  • Optimized for secure virtualized environments; TrustSec, Virtual Device Contexts
  • Ideal for collapsed data center-campus core deployments

Cisco Catalyst 4500E Series Switches
  • Modular switch offering 1.6-terabit capacity with Virtual Switching System
  • Competitive feature set and performance for midsize distribution networks
  • Flexible, comprehensive design adapts to changing system and service demands
  • High availability bolstered by In-Service Software Upgrade and Control Plane Policing
  • Ideal for collapsed distribution-access and small to medium distribution deployments

Cisco Catalyst 4500-X Series Switches
  • Fixed aggregation switch for space-constrained environments, in a 1 RU form factor
  • 1.6 terabits per second capacity with Virtual Switching System (hardware-ready)
  • Best-in-class scalability of up to 32-times better routes than competitor products
  • Simplifies creation of separate logical networks with Easy Virtual Network (EVN)
  • Integrated services: medianet, Cisco Trustsec, Flexible NetFlow, and Wireshark

Cisco Catalyst 3750-X Series Switches
  • Stackable fixed-configuration switches for smaller, restrictive deployments
  • Advanced Layer 3 and Layer 2 switching and security services
  • Support for Gigabit and 10 Gigabit Ethernet aggregation
  • StackWise Plus and StackPower deliver high availability and operational efficiency
  • Comprehensive support for high-value Borderless Networks services

Campus LAN – Access Switches
Adapt your network to meet evolving business requirements and optimize new application deployments with Cisco access switches.

Cisco Catalyst 4500E Series Switches
  • Modular switch offering 1.6-terabit capacity with Virtual Switching System
  • Competitive feature set and performance for midsize distribution networks
  • Flexible, comprehensive design adapts to changing system and service demands
  • High availability bolstered by In-Service Software Upgrade and Control Plane Policing
  • Ideal for collapsed distribution-access and small to medium distribution deployments

Cisco Catalyst 3750-X Series Switches
  • Stackable fixed-configuration switches for smaller, restrictive deployments
  • Advanced Layer 3 and Layer 2 switching and security services
  • Support for Gigabit and 10 Gigabit Ethernet aggregation
  • StackWise Plus and StackPower deliver high availability and operational efficiency
  • Comprehensive support for high-value Borderless Networks services

Cisco Catalyst 3560-X Series Switches
  • Fixed-configuration switches for campus and branch deployments
  • High-availability and advanced security features assure consistent service
  • Service and network modules help enable incremental link and service upgrades
  • Full Power Over Ethernet Plus and comprehensive Borderless Networks services

Cisco Catalyst 2960 Series Switches
  • Stackable (with Cisco FlexStack) fixed-configuration Layer 2 switches
  • Cost-effective solution for mid-sized organizations and branch offices
  • Full Power Over Ethernet Plus and baseline Borderless Networks services
  • Zero-touch deployment and operations via Catalyst Smart Operations

Campus LAN – Compact Switches
Securely and easily deploy services anywhere. These fanless, sleek, compact switches are ideal for spaces with limited wiring and cabling infrastructure, such as kiosks, conference rooms, and call centers.

Cisco Catalyst 3560 and 3560-C Series Compact Switches
  • Sleek quiet switches deliver comprehensive access services outside the wiring closet
  • Support for Power Over Ethernet Plus, Cisco EnergyWise, and advanced QoS
  • Unique PoE pass-through capability eliminates the need for power outlets
  • Cisco TrustSec and MACsec support plus Payment Card Industry security compliance
  • Zero-touch remote deployment and operations enabled by Catalyst Smart Operations

Cisco Catalyst 2960 and 2960-C Series Compact Switches
  • Sleek quiet switches deliver baseline access services outside the wiring closet
  • Support for Power Over Ethernet Plus, Cisco EnergyWise, and advanced QoS
  • Unique PoE pass-through capability eliminates the need for power outlets
  • Cisco TrustSec support plus Payment Card industry security compliance
  • Zero-touch remote deployment and operations enabled by Catalyst Smart Operations

MORE NOTES: Cisco switches info: Overview, Products & Solutions, Technology you can visit: http://www.cisco.com/en/US/products/hw/switches/index.html

More tips and How-to’s related to Cisco Catalyst switches you can visit:
http://www.cisco.com/en/US/products/ps11527/Products_Sub_Category_Home.html
Cisco Switches: Compare Products and Solutions
http://www.cisco.com/en/US/products/hw/switches/products_category_buyers_guide.html
related articles:WS-C2960S-48TS-L , WS-C2960S-24TS-L, WS-C2960S-48FPS-L, WS-C2960S-48LPS-L, WS-C2960S-24PS-L

2012年3月15日星期四

Cisco Equipment, Reliable & Cost-Effective

Cisco always comes into your mind when cisco networking equipment is needed in your home, SOHO or enterprises of different sizes. But it is found that Cisco hardware is a little expensive for some businesses. So you could find your solution in used Cisco equipment. If you just make sure your supplier is a genuine one, you can get Cisco equipment of the same quality at half the price or even less. For example, router-switch.com is a leading Cisco supplier who has earned a name for itself because of its genuine Cisco hardware and better customer service.

Talking about it, we think of many comments on router-switch.com and its Cisco network hardware from clients:
“We are regulars, having been cooperated with router-switch.com for several years; appreciate it in its good Cisco’s quality, a wide range of Cisco network hardware, especially Cisco routers, Cisco switches, firewall security…, looking forward to for further deep collaboration.”

“Cisco routers? Network switches? Firewall? Yeah, right Cisco store to meet almost all your switching, routing and security needs.Over last 4 years, we've got various Cisco products from router-switch.com for different kinds of offices and enterprises. ”

“Original Cisco hardware, the best possible price, and your excellent customer service let us can’t refuse it. Hope to get your more discounts for Cisco hot items as soon as possible.”

Router-switch.com, the World's Leading Cisco Supplier, was founded in 2002, providesmore than 8000 customers around the world with new and refurbished and used Cisco networking equipment, including Cisco routers, Cisco switches, Cisco firewalls, IP Phone, GBICs, GLCs, WIC NM network modules, memory & flash, cables, and other network kits.Their technicians ensure that the equipment is clean and in good working condition.

They have put in place a robust equipment replacement policy. As the executive puts it, “We will happily send replacement units with expedited service prior to receiving failed units back. It is our intention to service your company’s needs with as little downtime as possible.” The company is willing to use any shipping means for quick delivery. DHL, FedEx, Ups, EMS, PayPal, etc. more convenient way of payment you can choose.

If the clients are yet suspicious regarding the quality of equipment, their concerns are allayed by a standard 90 Day full replacement warranty on all used cisco hardware. Customers can also opt for extended warranty periods that need to be negotiated at the time of purchase. Any extended warranty needs to be indicated on the final invoice.

About Router-switch.com
Router-switch.comhas carved a name for itself for selling best quality new, used Cisco equipment including Cisco routers, Cisco switches, Cisco firewalls, IP Phone, GBICs, GLCs, WIC NM network modules, memory & flash, cables, etc. More intro of router-switch.com you can visit:
http://www.router-switch.com/about_us.html

Contact Information
Email: cisco@router-switch.com (Sales Inquiries)
webmaster@router-switch.com (Technical Inquiries)

Tel: +852-3174-6166 (Hong Kong)
Fax: +852-3050-1066 (Hong Kong)

Address: 7/F, Sino Centre, 582-592 Nathan Road, Mongkok Kowloon HongKong
Country: Hong Kong

2012年2月10日星期五

Cisco Firewalls Security, Essential for Business’s Safety


Owing to weak defense for net virus, firewall security plays a vital role in internet safety, so a reliable network asa 5520 aip 20 k9 helps your company or home net keep unauthorized visitors from accessing valuable business resources.

Instead of providing only point products that set a base level of security, Cisco embeds network firewall security throughout the network and integrates security services in all its products. As a result, network firewall security becomes a transparent, scalable, and manageable aspect of the business infrastructure.

As a leading designer and manufacturer of networking solutions, Cisco is always providing reliable integrated network firewall solutions with high performance to help secure various network environments.

Email and web Security, network Security, cisco asa5505 bun k9  secure access Control, secure mobility, security management, all these have been considered in designing a best solution to protecting your business’ net safety.

Cisco firewall security includes popular Cisco ASA 5500 series, Cisco PIX firewall security, Cisco IPS 4200 Series Sensor, etc.

More about Cisco ASA 5500 Series
Cisco ASA 5500 Series adaptive security appliances are purpose-built solutions that combine best-of-breed security and VPN services with the innovative Cisco Adaptive Identification and Mitigation (AIM) architecture.

Designed as a core component of the Cisco Self-Defending Network, the Cisco ASA 5500 Series provides proactive threat defense that stops attacks before they spread through the network, controls network activity and application traffic, and delivers flexible VPN connectivity. The result is a powerful multifunction network security appliance family that provides the security breadth and depth for protecting home office, branch office, small and medium-sized business, and enterprise networks while reducing the overall deployment and operations costs and complexities associated with providing this new level of security.

More info of Cisco asa5510 aip10sp k8 and other Cisco firewalls security you can see routerswitch.com or cisco.com to check. Price and purchasing details are also offered at Cisco firewall security at router-switch.com. 

More Notes:
Network Firewall: Keep Intruders Out
A reliable network firewall helps your company keep unauthorized visitors from accessing valuable business resources.

Instead of providing only point products that set a base level of security, Cisco embeds network firewall security throughout the network and integrates security services in all its products. As a result, network firewall security becomes a transparent, scalable, and manageable aspect of the business infrastructure.

Network Firewall: An Integrated Approach
Cisco offers several integrated network firewall solutions to help secure various network environments:
  • ASA 5500 Series: Controls network access at the WAN edge or within the LAN
  • Cisco IOS Firewall: Helps control application traffic
  • Firewall Services Module (FWSM) for Catalyst 6500 Series Switches and 7600 Series Routers: Allows a port to act as a firewall and protect traffic within the LAN or at the network perimeter
  • Embedded Firewall Services in the ASR 1000 Series Routers: Adds firewall functions at the network perimeter to protect network services
  • Web Application Firewall: Helps XML-based application traffic securely reach its destination

You can deploy these firewalls separately or combine them for a layered, defense-in-depth approach. Each network firewall is designed in accordance with the best practices and guidance developed for real-world solutions in the Cisco asa 5500 SAFE Architecture.

2012年1月16日星期一

How to Reset Password on a Cisco Router

How do I reset the password on my Cisco 1841 Router?
I bought a Cisco 1700 router from an auction, but there is a password. How can I reset the router to original factory specifications?

Sky sagem wireless router reset password I just got this sky wireless router second hand and it has a password set on it. i tried to press the reset button at the back but it does not do anything, it still comes as a password is set.

How to reset password on dlink wireless router I have a dlink wireless router model number DIR 825. It works well but I am trying to access internet on my ipod and the password i have set is incorrect, this also happened when i tried to access internet on my laptop. When i first set up my ps3 i don’t recall having to put a password in but this was when i first got the router. How do i reset the router password or find out what the password is AND if i reset the password or reset my router will my ps3 have to be reconnected or will it stay

How to reset password on a router I recently acquired a linksys CISCO1841-T1-V2 router (used) and need to know how to reset the password so that I can use it. Also, is there any way to modify a router to be useful as a cellwifi blocker, or as a signal booster?
...
----From Yahoo Answers

To reset password on a Cisco, D-link, Linksys, Netgear router is a very common problem among people who want a secure network environment for surfing on the internet. If you are confused with the complicated procedure to reset or change the password on a router, or if you are trying to configure a Cisco router, but a password is blocking you from enable mode, don't worry, just do the steps as follows, password reset on a router is no longer upset to everyone.

First, be informed that what you need
.Cisco Router
.Computer
.Internet Connection
.Blue Serial Cable

Guide for You to Reset Password on a Cisco Router
1. Download a program called Putty from the first resource site below. PuTTy is a terminal emulator application which can act as a client for the SSH, Telnet, rlogin, and raw TCP computing protocols (PuTTy on Wikipedia).httpen.wikipedia.orgwikiPuTTY

2. Connect one end of the blue serial cable to the cisco 1900 series router and the other to your computer. Open up the Putty program on your computer and select the radio button next to serial on the right-hand side of the start window. Click on the Open button in the bottom right-hand corner of the Putty start window to open the terminal.

3. Power the Cisco Router on. As soon as the router begins loading in the green and black Putty terminal window, press the Ctrl and Break keys simultaneously until its going into rommon mode.

4. Once in rommon mode, you have to change the configuration register number to make the router boot from a blank configuration file. For the 2800 series Cisco Routers, the command confreq 0x2142, changing the register number to 2142, worked. Search on cisco.com for information on your particular Cisco Router Series.

5. Type the restart command in rommon mode, which is reset. This will boot the router up again. When it is finished, you should be able to type en to get into enable mode without a password.

6. Once you change the running-config in RAM and save it to the startup-config in NVRAM, remember to change the configuration register number back to its default (usually 0x2102). This is important if you change anything on the running-config.  ---by Gabe

Easy five steps help you finish resetting password on a Cisco 1841 picture. Easy instruction, easy to follow.