[Xorp-users] PIM-SM not forwarding multicast traffic

[swdickey at rockwellcollins.com]

Thanks Ben.  Wireshark showed a TTL of 1 which is the default multicast 
datagram TTL.  My test program I needed the lines:

u_char ttl 64;
setsockopt(sd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl) < 0);

S. Dickey




Ben Greear <greearb at candelatech.com> 
18/08/2011 02:25 PM

To
swdickey at rockwellcollins.com
cc
xorp-users at xorp.org
Subject
Re: [Xorp-users] PIM-SM not forwarding multicast traffic






On 08/17/2011 04:34 PM, swdickey at rockwellcollins.com wrote:
>
> Hello all,
>
> I am currently having an issue getting PIM-SM working with Xorp v1.8.3 
on Fedora 14.
>
> *Setup:* Three in a line
>
> Fedora14_A <eth0 10.10.30.1 ------------ eth1 10.10.30.2 > Fedora14_B 
running XORP <eth0 10.10.40.2 ------------ eth1 10.10.40.3> Fedora14_C
>
> I am trying to send multicast traffic from A to C via multicast 
forwarding through B. I have a test program (which I can post if needed) 
that will send UDP
> datagram messages from A to 224.1.1.1. B will receive these messages, 
but will not forward them to C. Alternately, if I try sending the 
multicast messages from
> B, C will then receive them- indicating that C is properly subscribed to 
the IGMP group and is correctly configured. Also, Unicast traffic (pings) 
is being
> forwarded by B (XORP enabling ip_forward) as there are static routes 
setup on B.

Can you sniff to make doubly sure that you have TTl > 3 or so?

If unsure, post a small pcap capture file on the sending machine.

Thanks,
Ben

-- 
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

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