07-31-2008 08:12 PM - edited 03-03-2019 10:59 PM
HI Pradeep,
. There are three router A, B, C. A router having internet access and router A to B one Point to point Leased line, Router B to C one point to point Leased line.
Router C
One default router
Ip route 0.0.0.0 0.0.0.0 router B interface IP
Router B
IP route 0.0.0.0 0.0.0.0 Router A interface IP
IP route router C LAN network Router C serial int IP
Router A
IP route 0.0.0.0 0.0.0.0 ISP gateway.
This is our configuration.
I am able to ping Router C LAN IP from Router A
I am able to ping Router A and Router C LAN ip from Router C
I am able to ping Router B LAN ip and Loopback IP, but unable to ping Router A IP from Router C that is my problem , there is no dynamic routing protocol only default and static,
Please posted your Ideas for this
Solved! Go to Solution.
08-05-2008 12:48 AM
Hi,
As mentioned in previous post there is problem in your config.
RtrA dont have any information regarding C. Try to ping RtrB interface-ip add which is conneted to RtrC. Also try extended ping test from RtrA where you mention src-intrf which is connected to B. Here the ping will fail. The reason is the destination is not present in your routing table.
You said that you are able to ping from RtrC to RtrA while you are unable to ping from RtrA to RtrC which is highly impossible unless and untill you are have changed the src interface.
HTH
Cheers,
Nikhil E.
07-31-2008 09:14 PM
On the router A,
- add route for the Router C LAN IP subnet and
- also for the Serial interface IP subnet ,
both pointing towards router B.
07-31-2008 10:41 PM
What about defoult gateway on every one.(A,C)
08-01-2008 04:01 AM
On the router A:
IP route
IP route
08-01-2008 09:40 AM
Thiru,
From yur OP:
"I am able to ping Router A ... from Router C."
"I am ... unable to ping Router A IP from Router C that is my problem"
These two statements directly contradict each other.
Based on what you said in your OP, router A would have a routing table that looked like this:
C subnet to ISP -> directly connected
C serial net from A to B -> directly connected
S 0.0.0.0 0.0.0.0 -> ISP's router IP address
If you tried to ping router C's LAN interface it would send the packet to your ISP because that's the only route that matches in your routing table.
I believe what dhananjoy proposed should solve your problem.
HTH
08-02-2008 05:30 AM
I am able to ping router C from router A but unable to ping router A from router C.
08-02-2008 05:59 AM
On the router A:
IP route
IP route
Router A:
Ip route < router c LAN>
Ip route < router c serial>
Ip route 0.0.0.0 0.0.0.0 internet gateway
Router B
Ip route 0.0.0.0 0.0.0.0 serial B-A
Ip route < router c LAN>
Router C
Ip route 0.0.0.0 0.0.0.0 serial C-B
Please find the routing information .
From Router B
I am able to ping internet and router C LAN IP's
From Router A
I am able ping internet and router C LAN IP's
From Router C
I am able to ping Router B serial IP but unable to ping internet and Router A
I am suspecting problem with router B, please any one help me
08-02-2008 01:16 PM
Thiru:
Dont be so mysterious. Just give is the uncensired config. Your fill-ins are confusing.
Show us the addresses as they really are....
Victor
08-04-2008 06:49 AM
You second post shows a different configuration than you stated in the OP. I agree with Victor, post the real sanitized configs.
08-02-2008 06:00 PM
Let me get this straight you can ping router b from router c correct nut cannot ping router a from c
a--b ok b--c ok a--c error
make sure rtra has next hop route to c meaning a and b directly connected Ex
rta
rtrb
ip route 10.10.10.1 255.255.255.0 20.20.20.1
make sure you get return traffic from c to a .HTH
08-02-2008 06:22 PM
Does rtr c have a return route for rtra also could you post the router table from a b c
08-03-2008 05:57 AM
a--b ok b--c ok a--c error ( correct )
I am facing problem when i am ping Router A from Router C .
08-04-2008 09:27 AM
It appears that C does not have a return path for RTRA can you post the route table on RTRC.You are using static routes only correct
08-04-2008 11:46 PM
Yes i am using only static routes
08-05-2008 12:20 AM
On router A you have to configure the returnpath for routerC-LAN, without this returnpath router A will send all his traffic to ISP.
You say in your original post, router A can ping to router C, but router C can not ping to router A. Maybe router C address also can be found on ISP side, that's why router A got ping responses (something else is answer)
I suggest you post your configs and the result of "show ip route" for your three routers.
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: