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CONFIG_MROUTE: Allow multicast routing

Description

Under TrueNAS CORE it was possible to set the sysctl

net.link.ether.inet.allow_multicast = 1

to enable multicast routing to the host system and the VMs.

Under TrueNAS SCALE the support for multicast routing seems not to be compiled in the kernel:

root@System:~# sysctl -w net.conf.all.mc_forwarding=1
sysctl: cannot stat /proc/sys/net/conf/all/mc_forwarding: No such file or directory

I dont know its a bug or its wanted, but under TrueNAS Core it was possible at all.

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Michael Kirgus June 22, 2022 at 4:45 PM

Thanks, with that information i think i could manage it to work...i was just not sure if that was compiled with it...because multicast routing is not very common 😉.

But because of the read-only-filesystem and the changes that are required at the base system i think it would be better to perform the multicast routing on another place...

Solved!

Ameer Hamza June 22, 2022 at 1:28 AM
Edited

Hello ,

TrueNAS Scale kernel is already compiled with multicast forwarding config option. In linux, "sysctl net.ipv4.conf.all.mc_forwarding" reads from a proc file "/proc/sys/net/ipv4/conf/all/mc_forwarding", which is read only, e.g.,

However, Multi cast routing daemons like pimd can help update this value.

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Katalon Platform

Created January 5, 2022 at 12:08 AM
Updated July 6, 2022 at 8:58 PM
Resolved June 22, 2022 at 4:48 PM
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