Interface not to ping

Hello community,

I have a problem that I just don't understand - although I do not know there is a simple explanation.

R3 can not ping itself on 172.28.38.11/16 and I do not understand why. I appreciate R2 has of an interface on Eth 1/2 with ip address 172.28.38.1/24, but its on a separate router and a different mask.

Can someone please explain what I'm missing here.

Please see newspapers

See you soon

I did lab for you and came up with the same result.

R1 cannot ping interface connected locally because of the longest matching rule:

R1(config-Router) sh ip #do road

Code: C - connected, S - static, mobile R - RIP, M-, B - BGP

D - EIGRP, OSPF, IA - external EIGRP, O - EX - OSPF inter zone

N1 - type external OSPF NSSA 1, N2 - type external OSPF NSSA 2

E1 - OSPF external type 1, E2 - external OSPF of type 2

i - IS - Su - summary IS, L1 - IS - IS level 1, L2 - IS level - 2

-IS inter area, * - candidate failure, U - static route by user

o - ODR, P - periodic downloaded route static

Gateway of last resort is not set

172.13.0.0/24 is divided into subnets, subnets 1

C 172.13.0.0 is directly connected, FastEthernet0/1

10.0.0.0/8 is variably divided into subnets, 3 subnets, 2 masks

10.12.0.0/24 [110/30] by 172.13.0.3, 01:42:38, FastEthernet0/1

C 10.12.0.0/16 is directly connected, FastEthernet0/0

10.23.0.0/24 [110/20] by 172.13.0.3, 01:42:48, FastEthernet0/1

R1(config-Router) #do ping 10.12.0.1

Type to abort escape sequence.

Send 5, echoes ICMP 100 bytes to 10.12.0.1, wait time is 2 seconds:

.....

Success rate is 0% (0/5)

Italic is the locally 10.12.0.0/16 subnet with R1 to 10.12.0.1/16. R2 has 10.12.0.2/24. When you ping 10.12.0.1, the router examines the routing table and the view that 10.12.0.0/24 is the most specific match and tries to send it to R2 Fa0/1.

In addition, you use OSPF, masks of the neighbor must match. You will notice that the interface you are trying to ping is an adjacency with the neighbor on the other side. Thus, the route that must be connected is in fact being learned a different interface because of the mask do not match and no contiguity on this interface.

On the R1 debug ip packet:

* Mar 1 02:53:33.951: IP: tableid = 0, s = 172.13.0.1 (FastEthernet0/0), d = 10.12.0.1 (FastEthernet0/1), routed via RIB

* Mar 1 02:53:33.951: IP: s = 172.13.0.1 (FastEthernet0/0), d = 10.12.0.1 (FastEthernet0/1), g = 172.13.0.3, len 100, forward

* 02:53:33.955 Mar 1: type ICMP = 8, code = 0

I have attached my topology for you to see. Here's my adjacencies:

R1:

Neighbor ID Pri State Dead Time Interface address

172.13.0.3 1 FULL/DR 00:00:34 172.13.0.3 FastEthernet0/1

R2:

Neighbor ID Pri State Dead Time Interface address

172.13.0.3 1 FULL/DR 00:00:32 10.23.0.3 FastEthernet0/1

R3:

Neighbor ID Pri State Dead Time Interface address

10.23.0.2 1 FULL/BDR 10.23.0.2 FastEthernet0/1 00:00:33

172.13.0.1 1 FULL/BDR 172.13.0.1 FastEthernet0/0 00:00:39

So what I did was to create a static route for 10.12.0.1/32 pointing to fa0/1 (172.13.0.1) in R3. Then I created a static route on R2 to R3 10.12.0.1/32. I could do a ping at this time:

R2 #trace 10.12.0.1

Type to abort escape sequence.

The route to 10.12.0.1

1 10.23.0.3 48 ms 36 ms 24 ms

2 172.13.0.1 84 MS * 52 msec

R2 #.

Before doing so, I couldn't do a ping of R2 at 10.12.0.1/32. The reason was once he hit R3, R3 was a road for 10.12.0.0/24 of R2 and referred it back to R2, creating a loop.

Now I can ping R1, but why? R1 sends still to R3 but R3 says now R1 to get back to itself on 172.13.0.1:

R1 #ping 10.12.0.1 rep 2

Type to abort escape sequence.

Send 2, echoes ICMP 100 bytes to 10.12.0.1, wait time is 2 seconds:

!!

Success rate is 100 per cent (2/2), round-trip min/avg/max = 28/48/68 ms

R1 #.

R3 #.

* 03:08:14.523 Mar 1: ICMP: redirect sent to 172.13.0.1 for 10.12.0.1 dest, use gw 172.13.0.1

R3 #.

So, it is definitely the longest matching rule. You can try this to fix yours although I certainly wouldn't do it in production because their no reason really. Put a static route on the host that would be your next hop for the longest subnet (whatever the host is called f0/1). You can put a static on this host for 172.28.38.1/32 pointing to his next jump back to this router. Once you do this, R3 will send a package and it will get returned with a response. It is only a thing of laboratory

HTH,
John

Please note all useful messages *.

Tags: Cisco Network

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