Router1 to Router2 cant ping and vice versa

[Xaviar]

trying to ping router 2 from router 1 cant but ican ping the serial0/0/0 but not either IP Gig0/0 each way on both routers cant reach anything on either side of ea network but can ping router 1 network from router 1 and same for router 2 please help and thank you.

[David Ruess]

Hello,

I cant check the PT file at the moment but have you configured routing to reach the networks on each router either with a routing protocol or static routes? If you can ping the connected interface but not the networks behind it they likely cant reach it because they dont have a route.

-David

[Harold Ritter · Accepted solution]

Hi @Xaviar ,

You need to enable ospf on the serial interface between the two routers.

router 1:

router ospf 1

network 172.16.255.0 0.0.0.3 area 0

router 2:

router ospf 1

network 172.16.255.0 0.0.0.3 area 0

Regards,

[Xaviar]

i spent many hours on this, I'm new to packet tracer but I have learnt much from all the mistakes this one brought me much grief! Tyvm Harold, you have brought me peace!

[Harold Ritter]

You are very welcome @Xaviar and thanks for the feedback

[Joseph W. Doherty]

From what I could see (difficult since you have enable passwords set on the routers), it's likely what @David Ruess suspects, you don't have correct routing information.

You need to either correct your static (default) routes or correct OSPF (you also don't need both - nor use both as you're doing).

For OSPF

change

network 172.16.0.0 0.0.0.255 area 0

to

network 172.16.0.0 0.0.255.255 area 0

or

change the default route to use the serial link's far side IP, e.g.

R1 change

ip route 0.0.0.0 0.0.0.0 172.16.1.1

to

ip route 0.0.0.0 0.0.0.0 172.16.255.2

converse for R2.

[Martin L]

OSPF is not running on serial interfaces and therefore routes are not exchange; so left router does not know how to reach GiG network off the right router and vice versa. In order to establish neighboring adjacencies and exchange routes both routers must be on the same network link (directly connected), must agree on on some of ospf paraments/values included inside of Hello packets (such as link type, Hello/Dead timers, area id, authentication.) 

Regards, ML
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