Can't ping hosts across eigrp

[paquinjrm]

Hi,

  Using Packet Tracer, I'm trying to ping hosts across a simple eigrp but attempts fail.  Hosts can ping their respective routers and one host (PC10) can ping a third (PC11) through ripv2 with no difficulty.  I'm including the .pkt for reference.  Specifically, PC10 cannot ping PC12 across Router_2 and Router_3.

Any thoughts?

[nkarthikeyan]

Hi,

I guess the interface connecting R2 and R3 is configured with different ip subnet ranges, where it lacks with eigrp[ formation between the routers. Please check and make neccessary change to make it work.

Hope this helps.

Regards

Karthik

[paul driver]

Hello

Can you post the config of the eigrp routers please

res

Paul

[paquinjrm]

Router_2:

interface Serial0/1
 ip address 172.26.1.1 255.255.255.0

router eigrp 90
 network 192.168.0.0
 network 172.27.0.0
 auto-summary

Router_3:

interface Serial0/1
 ip address 172.27.1.1 255.255.255.0

router eigrp 90
 network 192.168.0.0
 network 172.26.0.0
 auto-summary

[paul driver]

Hello

both rtrs

Router eigrp 90

no auto-summary

res

paul

[paquinjrm]

Sorry to say that didn't work.

Mind you, it allowed me to discover there was no adjacency being made because the serial interfaces were on different subnets (172.26.x.x vs 172.27.x.x).  Having set them to 172.27.1.1/24 (R2) and 172.27.1.2/24 (R3), adjacencies were formed but...

pinging the hosts still won't work.

[paul driver · Accepted solution]

Hello

Apologies i didn't even notice the the inconsistency of the ip addresses

why do you have the physical interfaces in different subnets ?

change the IP address to the same subnet 

Res

paul

[paquinjrm]

Turns out the mistake was not adding a mask to the subnet. Ex:

Router_2(config_router)# network 192.168.0.0 0.0.255.255

Router_2(config_router)# network 172.27.0.0 0.0.255.255

Doing that on both routers made the hosts capable of pinging each other.

Thanks for the tips everyone 

[nkarthikeyan]

Good to know that you issue is resolved

Regards

Karthik