We have a cisco router in the network, we don't know its configuration. The computers in the network use it as default gateway to go on the internet. The problem is that when we put MT on the same network(LAN) following happens:
1. MT can ping the computers in the LAN
2. Computers in the LAN can ping the cisco
3. MT when tries to ping cisco, we get 3 pings and then RTO.
4. If we disable the interface and enable again then same thing happens, 3 pings and then RTO.
Why is this happening, is it possible that CISCO has some ACL or firewall enabled which detects another router(MT) in the network a drops all traffic coming from it?
Suggestions would be welcome.