ICMP:::Protocol Unreachable Error

[paridhi bansal <paridhibansal@yahoo.com>]

Hi

I have an application whereby i am receiving packets
from one network and forwarding to respective
destinations on other networks. I am using recvfrom
and sendto to accomplish this and have my ipforwarding
disabled..

The n/w is
A:192.168.1.1
B:10.2.1.1
Gateway:192.168.1.2
	10.2.1.2

The routing tables in A and B are set accordingly as
everything works fine with ipforwarding enabled.

The problem is:

When A pings to B using the gateway, gateway forwards
the packet correctly to B. B receives the echo request
packet. however,in return B sends the ICMP packet of
type 3 code 2 i.e. destination unreachable (Protocol
unreachable). And B sends this packet to gateway's
10.2.1.2 interface and not to A.

What canm be the possible problem???What's the way
out??

Paridhi




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