Hi,
i am working on linux but the problem is new for me.
i have a linux server with 3 NIC card.The configurations are below:
1.1st NIC:Real IP
2.2nd NIC:Local IP
3.3rd NIC:Local IP(which IP is allow by third party company).

Now,when i traceroute third party IP i have fallen into infinite loop.I cannot traceroute the third party IP.The fact is that the third party IP is traceble from my linux server.How can i do it.Please help me to solve the problem.

Thanks
Tishan

I think you don't know your own routes.
If a traceroute to NIC 3 is issued remotely, and comes in on the Real IP, Where is it routed to? Your routing tables will determine that.
Likewise, if a traceroute to www is issued via your 3rd NIC, what route will it take? If it has a choice, or no route at all, it's bad.

If you hit an infinite loop, you have 2 spots which each think they are the route to each other.
Box A says "Yes I have a route to C (via B)"
Box B says "Yes I have a route to C (via A)"
So A and B happily ping pong any packet until the Time To Live is expired.