SMCRoute is a daemon and command line tool to manipulate the multicast routing table in the UNIX kernel. Both FreeBSD and Linux kernels are supported, but it may work on other systems as well.
Problems? See the Multicast HowTo for help!
- Full IPv4 and IPv6 support
- Configuration file support, /etc/smcroute.conf
- Configuration include support,
- Support for restarting and reloading the
- Support for seamless reload and update on
SIGHUP, i.e., established multicast flows are not disturbed by reloading the configuration or adding/removing outbound interfaces to existing routes
- Source-less on-demand routing, a.k.a. (*,G) based static routing
- Support for ranges, (S/LEN,G) and/or (S,G/LEN), or (S/LEN,G/LEN), be careful though since this expands to multiple kernel routes
- Source specific group join support
- Optional built-in mrdisc support, RFC4286 (IPv4 only)
- Support for multiple routing tables on Linux
- Client with built-in support to show routes and joined groups
- Interface wildcard matching,
Why a Daemon?
One common question is why SMCRoute must be a daemon, why not just a
simple tool, like
ip route for unicast routes? The answer is that to
be able to add multicast routes a program must connect to the multicast
routing socket in the kernel, when that socket is closed, which is done
automatically when a UNIX program ends, the kernel cleans up all routes.
Origin & References
Since 2011 Joachim Wiberg heads development at GitHub. New features
include config file support, reloading config on
on-demand (*,G) routing, TTL scoping and support for disabling ALL
interfaces except the few used for multicast routing.
Issue tracker and GIT repository available at GitHub.