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October 25, 2011  1:34 AM

How to Configure PPPoE?



Posted by: Sulaiman Syed
Cisco, Configure, dhcp, how, interface, ios, PPPoE, router, virtual

This is one of the interesting things i have learned in past week. PPP over Ethernet (PPPoE). It is simple, yet tricky. It also has a limitation that network engineers might not know which will bring their network down. Lets see a sample configuration of how to do it. First, configure one Router...

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May 24, 2011  5:56 AM

GRE Tunnel ARP entry never times out! – part 1



Posted by: Sulaiman Syed
6500, AP, ARP, Cisco, dhcp, GRE, Tunnel, wireless, WLSM

I would like to clear the ARP entries automatically from the GRE tunnel made by the WLSM to the AP. here are the configurations of the tunnels.

interface Loopback1 description tunnel_source ip address 10.x.x.1 255.255.255.255

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March 22, 2011  7:30 AM

Configuring IP DHCP Snooping.



Posted by: Sulaiman Syed
binding, Cisco, configuration, dhcp, ip, mode, option 82, snooping, switch, transparent, vlan, vtp

The other day, a smart user (i consider him evil) attached a ADSL modem to the network port. What he didn't realize that his device was programmed to work as DHCP server. As a result, the whole vlan started getting the wrong IP address, and connectivity was lost. After investigation, we realized a...

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