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Route problem

Lost & Found


From site a I can't ping Site B router 3( but I can ping R2 of site B switch and workstation.


from Site A R1

IP Route is variably subnetted, 7 subnets, 4 masks
C is directly connected, Tunnel3
C is directly connected, FastEthernet0/1
O [110/3] via, 01:25:16, Port-channel1
O [110/2] via, 01:25:16, Port-channel1
O [110/3] via, 01:25:16, Port-channel1
C is directly connected, Port-channel1
C is directly connected, Loopback0
S* [1/0] via

Trace Route from R1

 1 8 msec 8 msec 4 msec
 2  *  *  *
 3  *  *  *
 4  *  *  *
 5  *  *  *

From Site B R2

Ip Route is variably subnetted, 8 subnets, 4 masks
O [110/1001] via, 00:23:47, Port-channel1
C is directly connected, GigabitEthernet0/0
O [110/2] via, 00:23:47, Port-channel1
O [110/2] via, 00:23:47, GigabitEthernet0/1
C is directly connected, GigabitEthernet0/1
O [110/2] via, 00:23:47, GigabitEthernet0/1
C is directly connected, Port-channel1
O [110/2] via, 00:23:47, Port-channel1
S* [1/0] via

How can I ping R3 of Site B from Site A.

Tried to add new OSPF network but it didnt work,

Please see the attached photo.


10 Replies 10



R2 doesn't appear to have a route to R3.

Can you ping R3 from R2?

1) maybe you've misconfigured Gi0/1 on R2. Gi0/1 should be configured for

2) make sure OSPF is advertising network from R2.



Yes from r1 i can ping r2 vise versa.

from site a

R1: added network area 5


from site b

R2: added network area 5

but upon check on ip route it still the same there no route

should I run the cmd clear ip ospf process?



Ok R1 can ping R2 which is good, but can R2 ping R3?

Also the network statement network area 5 is to advertise network which appears to be incorrect according to the diagram provided.

Can you confirm the network address (with mask) between R2 and R3 for me please?


yes r2 can ping r3.

also correct i will advertise for site B and for site

IP address of



Ok if R2 can ping R3, apply the following statement on R2 under the OSPF process.

network  area  5

then, clear ip ospf process on R2 (not necessary but am not sure of other changes you may have made on R2)

after that, try pinging R3 from R1 and see if it works.

If that doesnt work, paste the routing table of R1 and R2 again please.

let me know.



Let me just verify. i added /24 equivalent to on R2.

so network  area  5 on r2 its still the same.

what if i add it to R3?

what do you think?



R2 ip address you have provided is:

So you should add the following network statement in ospf on R2:

'network area 5' which will cover above R2 IP address.

If there is OSPF running between R2 and R3 then yes you will need to add the above network statement on R3 also. Otherwise it is not needed.


network  area  5
network  area  5


Did this work out in the end?


correction on this response: network area 5 is to advertise network not /28 network. apologies.

Rolf Fischer

Perhaps R3 just doesn't know how to reach the source network of R1's ICMP requests.

Couple of things to check:

Has R2 an OSPF adjacency to R3 (I don't see OSPF routes with next-hop Gi0/0 in R2's routing-table)? Can you post the output of 'show ip ospf neighbor Gi0/0' from R2?

As far as I can see, Po1 ( is the common subnet between R1 and R2.

Can you ping R3 from R2 with Po1's IP as source (R2# ping source Po1)?

If so, try the same on R1 (R1# ping source Po1).




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