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Community Member

Simple subnet problem?????

I am trying to bring up a wan link using a Cisco 4000 and 2500.

My server ip is (

e0 on the 2500 is

s0 on the 2500 is (

s0 on the 4000 is

e0 on the 4000 is

From the 2500, I can ping the server and both interfaces on the 4000. The 4000 can ping the interfaces on the 2500, but not the server. Ideas???

Thanks, Scott

Cisco Employee

Re: Simple subnet problem?????

Hello Scott,

Most likely its the default gateway of the server that is messed up. DO the extended ping from 2500 to the server and use 2500 S0 as the ousrce address. Most likely it will fail. This will prove that its the servre's default gateway that is not configured properly or if its configured properly then servre is not using it for some reason.

An example of extended ping is:

2500#ping ip

Target IP address:

Repeat count [5]:

Datagram size [100]:

Timeout in seconds [2]:

Extended commands [n]: yes

Source address or interface:

Type of service [0]:

Set DF bit in IP header? [no]:

Validate reply data? [no]:

Data pattern [0xABCD]:

Loose, Strict, Record, Timestamp, Verbose[none]:

Sweep range of sizes [n]:

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds:


Success rate is 0 percent (0/5)


Hope it helps,


Community Member

Re: Simple subnet problem?????

Yes, this may be true, you have to double check on the following,

1- both routers have "ip subnet-zero"

2- As Faraz said, double check on the gateway of the server.

Community Member

Re: Simple subnet problem?????



>Faraz was right.  The extended ping failed.


>The 2500 was added to existing equipment.  We changed the default gateway on

>the server to the 2500 e0.  and the extended ping worked.  but, it took the

>ip subnet-zero to get the workstation to see the server. (I am looking into

>what that actually does).


>My WAN link is up!  Thanks very much for the help.

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