[Xorp-users] Looping back PIM messages

[Venketesan]

I am sorry, i noticed in fact that the PIm control messages do go out 
of the interface 1 in router B, but i still dont know why they are 
also looped back to me when XORP is running. 
Thanks a lot.

venkat
 
----- Original Message -----
From: Venketesan <venkthi1 at iit.edu>
Date: Thursday, August 3, 2006 6:44 pm
Subject: [Xorp-users] Looping back PIM messages

> Hey all,
> 
> I am writing a multicast tunneling protocol in linux redhat 9. I 
> have 
> a program that 
> receives encapsulated PIm control messages on an interface that 
> basically connects to a non multicast router. 
> The topology is the following
> A---->0B1----->C
> 
> A is a non xorp linux box.
> B is a xorp linux box with my code running in it too.
> C is a pure XORP linux box.
> 
> I receive unicast encapsulated PIM control messages in B via A. My 
> code 
> receves thise control messages and decapsulates and sends them to 
> C. I 
> send these PIM-SM packets using a raw socket binded to IP address 
> of 
> interface 1 in B.
> 
> Now the issue is for some reason my program receves all the PIM 
> control messages back that it was supposed to send out. Xorp is 
> looping it back and not letting the packets go out of interface1 
> in B. 
> If i 
> stop xorp everything is fine and the packets are received at C.
> Note that i am not listening over any raw socket just sending PIM-
> SM 
> packets using them. The way i receive is in the kernel i intercept 
> PIM-
> SM packets, make a copy of the same and  pass it to my user space 
> program using netlink sockets.
> 
> Can anyone guide me on this issue, is it a expected behaviour of 
> XORP 
> to loop back any PIM-SM control packet not orginated by itself.
> I am using XORP 1.2
> regards,
> Venkat     
> 
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