Networking tutorials

Cisco Switch 2900/2950: Display VLAN information

contributed by CISSP06 on July 28, 2006 under Cisco switch

Knowing the commands to display configuration information about Virtual LANs (VLANs) is as important as knowing the commands to configure them. The commands here display information about all VLANs or a single VLAN by number or name.

 

How to use Microsoft IAS with Cisco VPN concentrator/ASA/PIX

contributed by CCIE14019 on July 2, 2006 under Cisco networking

VPN setup shows how to use IAS with VPN concentrator, ASA, or PIX. Basically, every vpn user connects with the same PCF file and enters into a group. When their username gets authenticated with ActiveDirectory, AD returns a group name to the CVPN/ASA/PIX and the pix puts them in that group.

 

How to setup IAS to use radius to authenticate Cisco device

contributed by CCIE14019 on July 1, 2006 under Cisco networking

This recipe shows how to configure IAS for Cisco equiptment using level 15 and also level 2 so you can have tech users and admn users, depending on which OU you’re in.

 

Configure Cisco router as an NTP server

contributed by qmchenry on June 19, 2006 under Cisco router

An NTP server can provide synchronized date and times for devices in a network. Since a router cannot be a Stratum 1 device (cannot connect to a Stratum 0 device such as a GPS clock), a router is not an accurate source of time information. If this is not important to you, then using a router as an NTP server may be acceptable.

 

Configure Cisco router to set time from NTP server

contributed by qmchenry on under Cisco router

Using NTP to synchronize the date and time of multiple devices makes sense even in a small network. When performing forensic analyses or troubleshooting connection problems, having consistent logging timestamps from multiple devices can save your life. Well, at least help keep your hair attached to your head.

 

Set the time on a Cisco router manually

contributed by qmchenry on under Cisco router

Setting the internal clock in a Cisco router allows timestamping of logging information which makes troubleshooting much easier. If you do not have an NTP server running, you can set the time manually with a simple command.

 

Cisco 2950 switch password recovery

contributed by BWAYCCTY on under Cisco switch

This documents the procedure for performing a password recovery on a Cisco 2950 switch (and probably other models, as well).

 

Set the telnet source IP address for a Cisco router

contributed by qmchenry on June 18, 2006 under Cisco router

The default source IP address when telnetting from a Cisco router is that of the interface closest to the destination. Because some access lists may block traffic from the default IP address, or to help test access lists, it may be useful to temporarily or permanently set the telnet source IP address.