Not receiving UDP data

[duttaa]

Hi,

This is the issue:

First the setup
------------------

System A - WIN XP
System B - Fedora 9

A and B is connected via a wireless DSL router.

ipconfig on A shows the following:
IP Address - 192.168.1.5
Subnet Mask - 255.255.255.0
Default Gateway - 192.168.1.1

ifconfig on B shows the following:

eth0 Link encap:Ethernet HWaddr 00:1D:72:FC:64:78
inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::21d:72ff:fefc:6478/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2702 errors:0 dropped:0 overruns:0 frame:0
TX packets:2985 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1864292 (1.7 MiB) TX bytes:658219 (642.7 KiB)
Interrupt:16

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:4784 errors:0 dropped:0 overruns:0 frame:0
TX packets:4784 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:245304 (239.5 KiB) TX bytes:245304 (239.5 KiB)

A UDP application trying to send test data from A to B (port 5060). The receiver at B is not getting the data.

I used analyser at B (wireshark)..which shows data is coming to B (192.168.1.2) but strangely the UDP application is not receiving the same.

To debug I ran this test:

Instead of A sending UDP data to B, I ran the sender application in B itself - this time the receiver app in B got the data.

The data is going through localloop instead of routing it via 192.168.1.2, though the applicatios are binded to IP:192.168.1.2

If I disable the lo - then the receiver does not get any data.

I am perplexed - any hints. It seems there is something wrong in the network configuration perhaps.



~Thanx
Abhijit

[Lazydog]

Firewall running on host B?