Download your favorite Linux distribution at LQ ISO.
Go Back > Forums > Linux Forums > Linux - Distributions > Red Hat
User Name
Red Hat This forum is for the discussion of Red Hat Linux.


  Search this Thread
Old 08-05-2013, 01:52 PM   #1
LQ Newbie
Registered: Mar 2010
Location: Dulles, VA
Posts: 7

Rep: Reputation: 0
Any way to setup multicast to route out 2 different network interfaces?

I have Linux ES5.5 server that has three network connections. I need to send Multicast output to 2 of those networks. Is this possible? I have the multicast route setup for eth2, but I also need to send multicast out eth1. The service that's sending the the multicast via eth1 knows to explicitly send it using that interface, and I do see that output when running tcpdump, but I wonder if it's actually getting out without the multicast route on that interface.


[root@app-server ~]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface UGH 0 0 0 eth0 * U 0 0 0 eth0 * U 0 0 0 eth2 * U 0 0 0 eth1 * U 0 0 0 virbr0 * U 0 0 0 eth0 UG 0 0 0 eth1 UG 0 0 0 eth2
default UG 0 0 0 eth0

tcpdump for eth1, searching for specific port and multicast address:

[root@app-server ~]# tcpdump -i eth1 -X -s0 port 1962 | grep ''
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes
11:51:37.260517 IP > UDP, length 5
11:51:38.333829 IP > UDP, length 5
11:51:48.336975 IP > UDP, length 5
11:51:48.578504 IP > UDP, length 5

Last edited by mav1c; 08-05-2013 at 01:53 PM.
Old 08-15-2013, 09:52 PM   #2
Senior Member
Registered: Aug 2009
Posts: 3,790

Rep: Reputation: 650Reputation: 650Reputation: 650Reputation: 650Reputation: 650Reputation: 650
How about bonding the 2 interfaces and sending out bond0 ?


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Two ethernet cards in a single network, how to route packets from both interfaces? nabi18 Linux - Networking 5 12-11-2010 02:49 PM
Xen network-route AND network-bridge setup kwiksand Linux - Networking 1 08-22-2010 03:18 PM
Combining multiple interfaces with multicast icedown Linux - Networking 1 04-03-2010 09:09 AM
How to route traffic on a network - cannot get machine to transfer across interfaces captainpotato Linux - Networking 15 10-04-2006 08:04 AM
Manual Network Setup Works, /etc/network/interfaces doesn't verdeboy2k Linux - Wireless Networking 0 05-31-2006 06:56 PM > Forums > Linux Forums > Linux - Distributions > Red Hat

All times are GMT -5. The time now is 03:41 PM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration