[LARTC] Linux as a multicast router

[LARTC] Linux as a multicast router

[Emin Gencpinar]

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Hi all,

We want linux (ubuntu) with 2.6 kernel to act as multicast router and to
pass multicast packets between different subnets. And linux machine as
router has two network cards having two different subnets assigned onto. We
first worked
"sysctl -w net.ipv4.ip_forward=1"
line on linux shell that made linux to work as unicast router. (like host,
the multicast packets were discarded at NIC). Then at weekend we heard about

"sysctl -w net.ipv4.conf.all.mc_forward=1"
line that is said to satisfy multicast routing requirement, but we did not
try this yet. Is this last line enough to work linux as multicast router ?

There is also one alternative we found: XORP ( Open Source IP Router )
http://www.xorp.org/livecd.html#getting
But this works from live cd. We want to also use linux shell at the same
time. And also we did not try this tool yet.

It is enough to use the linux as router, we do not consider the router
algorithms or any other thing.

Thanks in advance...
Emin

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Re: [LARTC] Linux as a multicast router

[Paul Zirnik]

On Sunday 14 January 2007 20:41, Emin Gencpinar wrote:
> Hi all,
>
> We want linux (ubuntu) with 2.6 kernel to act as multicast router and to
> pass multicast packets between different subnets. And linux machine as
> router has two network cards having two different subnets assigned onto. We
> first worked
> "sysctl -w net.ipv4.ip_forward=1"
> line on linux shell that made linux to work as unicast router. (like host,
> the multicast packets were discarded at NIC). Then at weekend we heard
> about
>
> "sysctl -w net.ipv4.conf.all.mc_forward=1"
> line that is said to satisfy multicast routing requirement, but we did not
> try this yet. Is this last line enough to work linux as multicast router ?

No, you need some kind of routing daemon for multicast forwarding/routing.
Look for "mrouted" or "zebra".

There is a HowTo for multicast, but no big infos on multicast
forwarding/routing ....

http://www.linuxjunkies.org/html/Multicast-HOWTO.html

> There is also one alternative we found: XORP ( Open Source IP Router )
> http://www.xorp.org/livecd.html#getting
> But this works from live cd. We want to also use linux shell at the same
> time. And also we did not try this tool yet.

Sorry, no clue about this. But if it is a Linux based live cd i'm sure you,
can also install it on disk :)

> It is enough to use the linux as router, we do not consider the router
> algorithms or any other thing.

regards,
         Tami
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