From: Manny Gonzalez (manny@xxxxxxx)
Date: Sun Nov 04 2001 - 03:41:42 GMT-3
Have you tried NOT using a default-network that points to a LOOPBACK?
John Neiberger wrote:
>
> I'll start with the original scenario that worked so I can show you where I
> began before I show you what I'm trying to accomplish now. There are three
> relevant routers here:
>
> A----(ospf)----B----(rip)-----C
>
> A originates a default route to B and I use default-information originate in
> the RIP config to pass 0.0.0.0/0 to C. This works well. Then I took RIP
> away and tried this with IGRP and ip default-network.
>
> This took some tweaking before I could get B to originate default route to
> C with IGRP. Is it just me or did Cisco seem to make this very
> user-unfriendly?? Unbelievable. This is *so* easy with other protocols.
> Anyway...
>
> In the first scenario, B has a single gateway of last resort: 0.0.0.0/0 via
> router A. Beautiful. In the second scenario I end up with two candidate
> GOLRs but neither is picked and routing breaks!
>
> This makes *zero* sense to me. If ip classless is configured and still
> have 0.0.0.0/0 in my routing table then B should route all packets with
> unknown destinations to A, right?? Well, it's not working and I can
> consistently recreate it.
>
> If I remove the ip default-network statement routing works but then C has no
> default route.
>
> What could be wrong here? For grins, I'll paste in some command output to
> show you what I mean. R4 is "Router B" in the above scenario.
>
> Gateway of last resort is 152.1.3.2 to network 0.0.0.0
>
> 152.1.0.0/16 is variably subnetted, 2 subnets, 2 masks
> O IA 152.1.1.0/25 [110/74] via 152.1.3.2, 05:19:53, Serial0
> C 152.1.3.0/30 is directly connected, Serial0
> 130.1.0.0/16 is variably subnetted, 9 subnets, 2 masks
> I 130.1.3.0/24 [100/1188] via 130.1.4.2, 00:00:28, TokenRing0
> I 130.1.2.0/24 [100/1188] via 130.1.4.2, 00:00:28, TokenRing0
> I 130.1.1.0/24 [100/1188] via 130.1.4.2, 00:00:28, TokenRing0
> O 130.1.0.0/22 is a summary, 05:19:54, Null0
> I 130.1.7.0/24 [100/1188] via 130.1.4.2, 00:00:29, TokenRing0
> I 130.1.6.0/24 [100/1188] via 130.1.4.2, 00:00:29, TokenRing0
> I 130.1.5.0/24 [100/1188] via 130.1.4.2, 00:00:29, TokenRing0
> O 130.1.4.0/22 is a summary, 05:19:54, Null0
> C 130.1.4.0/24 is directly connected, TokenRing0
> C 30.0.0.0/8 is directly connected, Loopback1
> O*N2 0.0.0.0/0 [110/1] via 152.1.3.2, 05:19:56, Serial0
> R4#ping 20.1.1.1
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds:
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 24/28/40 ms
> R4#
>
> After I add ip default-network 30.0.0.0:
>
> Gateway of last resort is not set
>
> 152.1.0.0/16 is variably subnetted, 2 subnets, 2 masks
> O IA 152.1.1.0/25 [110/74] via 152.1.3.2, 05:21:19, Serial0
> C 152.1.3.0/30 is directly connected, Serial0
> 130.1.0.0/16 is variably subnetted, 9 subnets, 2 masks
> I 130.1.3.0/24 [100/1188] via 130.1.4.2, 00:00:32, TokenRing0
> I 130.1.2.0/24 [100/1188] via 130.1.4.2, 00:00:32, TokenRing0
> I 130.1.1.0/24 [100/1188] via 130.1.4.2, 00:00:32, TokenRing0
> O 130.1.0.0/22 is a summary, 05:21:19, Null0
> I 130.1.7.0/24 [100/1188] via 130.1.4.2, 00:00:34, TokenRing0
> I 130.1.6.0/24 [100/1188] via 130.1.4.2, 00:00:34, TokenRing0
> I 130.1.5.0/24 [100/1188] via 130.1.4.2, 00:00:34, TokenRing0
> O 130.1.4.0/22 is a summary, 05:21:20, Null0
> C 130.1.4.0/24 is directly connected, TokenRing0
> C* 30.0.0.0/8 is directly connected, Loopback1
> O*N2 0.0.0.0/0 [110/1] via 152.1.3.2, 05:21:22, Serial0
> R4#
> R4#ping 20.1.1.1
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds:
> .....
> Success rate is 0 percent (0/5)
> R4#
>
> Any help would be appreciated. I'm about to swear off using IGRP and EIGRP
> for the rest of my life just on principle. :-)
>
> Thanks,
> John
>
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