Router Answering Pings and Tracerouts for ANY IP address

[cycledick]

I've got an Adtran MPLS router that answers pings and traceroutes for any IP address I try.

Lets say the IP address of the local Adtran is 192.168.0.1 and the Adtran router at the other location across the MPLS is 192.168.1.1. When I ping from my desktop, 192.168.0.2, to the remote location's Adtran, 192.168.1.1, I get a reply from my LOCAL Adtran. So it looks like this...

Reply from 192.168.0.1: bytes=32 time=16ms TTL=247
(even though I was ping 192.168.1.1)

It does this for ANY ip address I try and ping.

Now here's the weird part, it only responds to pings from seemingly random desktops. So, it will respond to all pings from desktop 192.168.0.2, but it WON'T respond to ANY ping from desktop 192.168.0.3.

Anyone have any idea why it would do that? I've been scouring the Internet for hours trying to find someone else who's had this problem. I've got our carrier looking in to the problem now, but it just seems to be a very weird result that caused about 3 hours worth of unnecessary troubleshooting.

 

[dberg35]

What is doing DHCP in your location? It could very likely be a conflicting default gatway.

 

[cycledick]

Mmmm, no DHCP at all. Only one statically assigned laptop (still testing).