Can't ping loopback address

Oct 17, 2007 1 Replies

I created a new loopback addres 10.100.0.1/.2 and I was not able to ping from one another. I can ping 10.19.0.1/2 and it works puzzling.



Side one



telnet@intrm401#sh ip route Total number of IP routes: 16 Type Codes - B:BGP D:Connected I:ISIS S:Static R:RIP O:OSPF; Cost - Dist/Metric Destination Gateway Port Cost Type



1 0.0.0.0/0 10.34.0.9 eth 3/2 1/1 S
2 10.0.0.0/24 10.34.0.5 eth 4/3 110/10 O2
3 10.0.10.0/24 DIRECT ve 100 0/0 D
4 10.0.11.0/24 DIRECT ve 200 0/0 D
5 10.18.100.0/30 DIRECT eth 1/1 0/0 D
6 10.19.0.1/32 DIRECT loopback 1 0/0 D
7 10.19.0.2/32 10.18.100.2 eth 1/1 110/10 O2
8 10.19.0.5/32 10.18.100.2 eth 1/1 110/10 O2
9 10.33.1.0/30 10.18.100.2 eth 1/1 110/10 O2
10 10.34.0.0/30 DIRECT eth 3/1 0/0 D
11 10.34.0.4/30 DIRECT eth 4/3 0/0 D
12 10.34.0.8/30 DIRECT eth 3/2 0/0 D
13 10.40.0.254/32 10.34.0.5 eth 4/3 110/10 O2
14 10.100.0.0/16 DIRECT loopback 6 0/0 D
15 10.102.0.0/16 10.18.100.2 eth 1/1 110/10 O2
16 216.229.82.221/32 10.18.100.2 eth 1/1 110/10 O2 telnet@intrm401#

side two


Type Codes - B:BGP D:Connected I:ISIS S:Static R:RIP O:OSPF; Cost - Dist/Metric Destination Gateway Port Cost Type



1 0.0.0.0/0 10.18.100.1 eth 1/2 110/10 O2
2 10.0.0.0/24 10.18.100.1 eth 1/2 110/10 O2
3 10.0.10.0/24 10.18.100.1 eth 1/2 110/10 O2
4 10.0.11.0/24 10.18.100.1 eth 1/2 110/10 O2
5 10.18.100.0/30 DIRECT eth 1/2 0/0 D
6 10.19.0.1/32 10.18.100.1 eth 1/2 110/10 O2
7 10.19.0.2/32 DIRECT loopback 1 0/0 D
8 10.19.0.5/32 DIRECT loopback 5 0/0 D
9 10.33.1.0/30 DIRECT eth 4/3 0/0 D
10 10.34.0.0/30 10.18.100.1 eth 1/2 110/10 O2
11 10.34.0.4/30 10.18.100.1 eth 1/2 110/1000 O
12 10.34.0.8/30 10.18.100.1 eth 1/2 110/10 O2
13 10.40.0.254/32 10.18.100.1 eth 1/2 110/10 O2
14 10.100.0.0/16 DIRECT loopback 6 0/0 D
15 10.102.0.0/16 10.33.1.2 eth 4/3 1/1 S
16 216.229.82.221/32 10.33.1.2 eth 4/3 1/1 S


interface loopback 6 port-name mangement soarwinds ip address 10.100.0.1/16 !



Why is your loopback a /16? Shouldn't it be a /32? Additionally, what are you pinging it from? Does the router with the loopback have a route back to the router that is pinging? Which interface is it using? It looks to me like both have a router to 100.0.0/16, via the same next hop, which doesn't make much sense if one owns it and the other does not?

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