Tag Archives: router

Setting Your Source Interface

Problem: I’ve set up VPN between the LANs on two routers and I want to test the link from LAN 1 to LAN 3.

192.168.1.1/24--[R1]--10.1.1.0/30--[R2]--10.2.2.0/30--[R3]--192.168.3.1/24

Default ping/telnet/ssh will fail because it will use the source address of the interface closest to the destination.

R1#ping 192.168.3.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds:
U.U.U
Success rate is 0 percent (0/5)

Solutions: Continue reading

RIP Quirks

As I understood it…

The default for RIP when it is enabled is to send version 1 and receive both versions 1 and 2. Then I got a practice question with a #debug ip rip output with the following line:

1d12h: RIP: ignored v2 packet from 10.1.1.1 (illegal version)

RIP practice question

Completely threw me, so I went back to my lab and discovered that you can also
configure RIP for version 1 only so it will reject V2 packets –

(config-router)#version 1 – Sure enough the output of #show ip protocols confirmed
this! Continue reading