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Three Routers with serial connections , can ping only In one direction

Hi.I have three routers connected with serial connections In a home lab (Router 10,11,12)

Routers 10 and 11 both connect to router 12.I have rip2 enabled on all routers but I disabled It between Router 11 and 12 and used a static route.

I can ping from router 11 to router 10 via router 12 but I can't ping from router 10 to router 11.I can ping from router 10 to router 12 though. The switch connected to router 10 can ping router 11 which Is what confuses me.

I've added a PT file but I'm locked out of the routers and switch.I don't know what I have to change In the config to fix this.

2 ACCEPTED SOLUTIONS

Accepted Solutions

Three Routers with serial connections , can ping only In one dir

Look at router 11 you have setup a route for connected interface-

interface FastEthernet0/0

ip address 192.168.10.1 255.255.255.0

duplex auto

speed auto

ip route 192.168.10.0 255.255.255.0 Serial0/0

You should put a route for subnet being used at router 10 since you are not running RIP between R12 and 11.

Thanks

Ajay

Purple

Three Routers with serial connections , can ping only In one dir

Hi,

you couldn't ping R11 from R10 because R11 hadn't got a route for 192.168.6.0 subnet.

you should get rid of your passive-interface command  for serials.I had to configure the clock rate on DCE sides also.

Now everything is ok.

Regards.

Alain

Don't forget to rate helpful posts.
20 REPLIES

Three Routers with serial connections , can ping only In one dir

Look at router 11 you have setup a route for connected interface-

interface FastEthernet0/0

ip address 192.168.10.1 255.255.255.0

duplex auto

speed auto

ip route 192.168.10.0 255.255.255.0 Serial0/0

You should put a route for subnet being used at router 10 since you are not running RIP between R12 and 11.

Thanks

Ajay

New Member

Re: Three Routers with serial connections , can ping only In one

I made a change In the config file to upload to ftp: The actual address Is 192.168.11.1 so the static route Is correct , pointing to .10.

The problem seems to be elsewhere.Still need help!!

I uploaded the right router 11 config file now.

Purple

Three Routers with serial connections , can ping only In one dir

Hi,

could you post a diagram or PT file or GNS3 file

R10 and R11 have same IP address on f0/0 and how are  R12 and R10 connected? s1/1 to s0/0 I suppose ?

Regards.

Alain

Don't forget to rate helpful posts.
New Member

Re: Three Routers with serial connections , can ping only In one

I've stupidly changed some configurations for uploading reasons and forgot to change them. R10 fa0/0 is 192.168.10.1.

  I'll upload a pt file later , at work right now.Thanks

New Member

Three Routers with serial connections , can ping only In one dir

S1/1 R12 connects to S0/0 R10

I've tried running the configs with PT but I get locked out with a password prompt In the CLI.I don't get the username and password prompt and any passwords I use fail.I removed the AAA from the config files.Not sure what I have to do.

I would delete this thread If I could , I've messed It up!

Three Routers with serial connections , can ping only In one dir

Hi Reprvoid,

From R10 you are not able to ping R11 as there is no route for 192.168.11.0 /24 in r10 routing table as you have made passive interface between R11 and R12, hence no updates from R11 to R12 and vice-versa. Nor you have made any static route in R10 to reach R11.

HTH,

Smitesh

New Member

Three Routers with serial connections , can ping only In one dir

The problem Is I can ping from a switch connected to R10 and reach R11 but I can't ping from R10 to reach R11 ??

Purple

Three Routers with serial connections , can ping only In one dir

Hi,

stay simple in your config, forget about AAA and CHAP and just focus on the routing.

Repost recent PT file and/or configs with a diagram and we'll take a look.

Regards.

Alain.

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New Member

Three Routers with serial connections , can ping only In one dir

Hi.Sorry for all the fuss.I've reattached the 3 router configs and the switch config.They are the most recent.

  I can ping router 11 from the switch connected to router 10.

Purple

Three Routers with serial connections , can ping only In one dir

Hi,

attach a PT or GNS3 file if you can also.

Regards.

Alain

Don't forget to rate helpful posts.
New Member

Three Routers with serial connections , can ping only In one dir

Hi.I've added a PT file but can't access the routers within Packet Tracer.I'm locked out.

Purple

Re: Three Routers with serial connections , can ping only In one

Hi,

do a password recovery, I'm gonna do it to work on your file

Regards.

Alain

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New Member

Re: Three Routers with serial connections , can ping only In one

I was thinking In terms of telnet passwords.I'm really not thinking today.My console password Is 1378 , the enable secret password Is reprovoforeal.

Purple

Three Routers with serial connections , can ping only In one dir

Hi,

no worries 

But your running-configs are a little bit strange.

don't do ppp chap and do not make any passive interface for RIP and don't overlap  subnets on different interfaces.

Regards.

Alain

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New Member

Three Routers with serial connections , can ping only In one dir

Hi.Aren't all the subnets different?

R10 192.168.10.0  serial 192.168.6.0

R11 192.168.11.0  serial 192.168.7.0

R12 192.168.12.0  serial 192.168.6.0 192.168.7.0

Thanks for your time , wont waste any more of It! What possible reason could there be for me being able to ping R11 from the switch but not from R10 ?

Purple

Three Routers with serial connections , can ping only In one dir

Hi,

you couldn't ping R11 from R10 because R11 hadn't got a route for 192.168.6.0 subnet.

you should get rid of your passive-interface command  for serials.I had to configure the clock rate on DCE sides also.

Now everything is ok.

Regards.

Alain

Don't forget to rate helpful posts.
New Member

Three Routers with serial connections , can ping only In one dir

Ok that makes sense I thought I had clockrates enabled on R12 for the other two routers.Don't answer that!

  I've learnt alot from this question so I can't guarantee I wont make any mrore strange configurations.I wont post any more wrong configurations though.Thanks for you help again!

New Member

Three Routers with serial connections , can ping only In one dir

I changed the PT file my s1/1 and s1/0 were the wrong way round.You probably noticed that no doubt!
I've made such a mess of this thread.I may not post againg for 2 years

Silver

Three Routers with serial connections , can ping only In one dir

This is not you case but if your running frame-relay, you can use router ODR and enable CDP in all your cisco routers so it can learn the networks running in your network with less routing overhead. this ODR command must be done in the hub router (hub and spoke enviorment)

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Posted by WebUser Julio C. Padilla

Silver

Three Routers with serial connections , can ping only In one dir

nice

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Posted by WebUser Julio C. Padilla

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