Re: Cluster: how to set mcast interface for dual LAN card?

[Rainer Jung]

Depends on the OS. Usually the system decides which interface to use 
depending on the routing table. E.g. on Solaris:

netstat -rnv shows:
  Destination             Mask           Gateway          Device Mxfrg 
 Rtt  Ref Flg  Out  In/Fwd
-------------------- --------------- -------------------- ------ ----- 
----- --- --- ----- ------
...
224.0.0.0            240.0.0.0       192.168.100.20       eri0    1500* 
   0   1 U        0     0
...

The shown entry is the multicast route (network 224.0.0.0 with netmask 
240.0.0.0). The traffic will go through the local interface eri0 which 
is the one with the local address 192.168.100.20.

If you want to route multicast through one of several interfaces on a 
multi homed system, you have to set the correct route (on Unixes using 
the route command). You can't do that inside Tomcat.

You need to have a good understanding of IP, networks, netmasks, routes 
and multicast.

Regards,
Rainer
Joseph Lam wrote:
Hi,
If I have two LAN cards and I want my Tomcat to mcast through one of them,
what parameter should I set?
Regards,
Joseph
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