01-19-2005
Joining multicast group on IPADDR_ANY - which interface?
Hello all,
I have the following question:
if you join a multicast group (with setsockopt() and IP_ADD_MEMBERSHIP) and specify INADDR_ANY as network interface to join on, the kernel is supposed to choose which interface to use (if there are multiple network interfaces, of course).
Does anybody here know how this default interface is chosen? How can I find out which interface on some machine will be used in this case, how can I configure a particular interface to be used as default for multicast join (if INADDR_ANY is used)?
I would appreciate any suggestions.
Alex.
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LEARN ABOUT DEBIAN
ssmping
ssmping(1) General Commands Manual ssmping(1)
NAME
ssmping - check if you can receive IPv4/IPv6 multicast data from an internet host
SYNOPSIS
ssmping [ -46v ] [ -I interface ] [ -c count ] [ -s size ] host
ssmpingd
DESCRIPTION
ssmping and ssmpingd are network level multicast management tools that can be used to check whether one can receive multicast packets via
SSM from a host. The host target given to ssmping must run the ssmpingd daemon, which listens on UDP port 4321 for IPv4 and IPv6 unicast
requests. When it receives one, it responds to a well known SSM multicast group which ssmping just have joined. Depending on whether the
request was made with IPv4 or IPv6, the group is 232.43.211.234 or ff3e::4321:1234 respectively.
OPTIONS
For ssmpingd there are no options. For ssmping the options are as follows.
-4 Force IPv4
-6 Force IPv6
-v Print client and server version information.
-I interface
Interface to join on
-c count
Stop after sending (and receiving) count requests (and replies)
-s size
Request replies to have a size of size bytes
SEE ALSO
asmping(1) a tool for checking whether can receive ASM.
dbeacon(1) a distributed beacon multicast implementation.
BUGS
Please report them to Stig Venaas <venaas@uninett.no>, the author of this tool.
HISTORY
ssmping and ssmpingd were developed by Stig Venaas during the early days of the m6bone, the IPv6 multicast backbone.
User Manuals ssmping(1)