EIGRP Default Network Route

Lessons Discussion
26

Hi @wilder7bc,

The ip default-network command is one of the weirder commands out there. I think I originally tried it on 12.4 when I wrote the lesson. On IOS 15.x, I can’t make it work…

The funny thing is, when I load my config, R1 doesn’t see 192.168.23.0/24 as a default network:

R1#show ip route 

D     192.168.23.0/24 [90/3072] via 192.168.12.2, 00:03:30, GigabitEthernet0/1

Once I remove and re-add the network command on R2, it does get propagated to R1:

R2(config-router)#router eigrp 12
R2(config-router)#no network 192.168.23.0
R2(config-router)#network 192.168.23.0

Here’s R1 again:

R1#show ip route 

Gateway of last resort is not set

D*    192.168.23.0/24 [90/3072] via 192.168.12.2, 00:00:02, GigabitEthernet0/1

It now shows the asterisk but still no gateway of last resort.

In your case, the output of R1 looks good to me. The host unreachable message in your Wireshark output from 192.168.23.3 to 192.168.12.1 means that R3 is telling R1 that it doesn’t know how to reach 3.3.3.3. This tells us that:

  1. The packet from R1 makes it to R3.
  2. 3.3.3.3 doesn’t exist on R3.

Looking at your output, you don’t have 3.3.3.3 on an interface on the ISP router? :slight_smile:

Rene