[OpenWrt-Devel] Unblockable mutlicast

Felix Fietkau nbd at openwrt.org
Sat Sep 6 08:07:23 EDT 2014

On 2014-09-06 08:25, Daniel Dickinson wrote:
> If I posted from the right account, it would help for asking asking a
> question...
> At the risk of seeming a complete n00b despite being far from it, why am
> I seeing this in iftop on BB-rc3 using iftop on the WAN?
> all-systems.mcast.net       =>
> all-systems.mcast.net      <=
> Which whois says is an arin.net IP (which is early arpanet DoD network
> IIRC).
> It cannot be blocked via iptables which has me curious as to exactly
> what kernel subsystem is doing this and why.
It's probably IGMP traffic, used to join/leave multicast groups. No need
to worry about this at all.

- Felix
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