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Old 11-06-2016, 04:06 PM   #1
robolux
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How do I disable multicast?


Hi!

I have been trying to disable this functionality for quite some time, but cannot seem to figure it out.

Within a 1 minute interval several packet sniffer tools report constant traffic from all-systems.mcast.net with a set size of 14 bytes.
http://s9.postimg.org/kacufgcbj/screen2.png
.

Code:
ubuntu@ubuntu:~$ netstat -g
IPv6/IPv4 Group Assignments
interface   RefZh Group
--------------- ------ ---------------------
lo              1      all-systems.mcast.net
eth0            1      all-systems.mcast.net
lo              1      ip6-allnodes
lo              1      ff01::1
eth0            1      ff02::1:ff84:d990
eth0            1      ip6-allnodes
eth0            1      ff01::1
Its designated IP is 224.0.0.1
Code:
ubuntu@ubuntu:~$ netstat -ng
IPv6/IPv4 Group Assignments
interface   RefZh Group
--------------- ------ ---------------------
lo              1      224.0.0.1
eth0            1      224.0.0.1
lo              1      ff02::1
lo              1      ff01::1
eth0            1      ff02::1:ff84:d990
eth0            1      ff02::1
eth0            1      ff01::1

I have already managed to stop other multicast packets, namely traffic from 224.0.0.251, using this:

Code:
sudo ifconfig eth0 -multicast
However, this has not stopped the all-systems.mcast.net traffic.

I have also unsuccessfully tried iptables, inspired by a website regarding the opposite of what I am trying to do:
https://www.centos.org/forums/viewtopic.php?t=8286

Code:
sudo iptables -A INPUT -s 224.0.0.0/4 -j REJECT
sudo iptables -A INPUT -d 224.0.0.0/4 -j REJECT
sudo iptables -A INPUT -s 240.0.0.0/5 -j REJECT
sudo iptables -A INPUT -m pkttype --pkt-type multicast -j REJECT
sudo iptables -A INPUT -m pkttype --pkt-type broadcast -j REJECT

Does anyone know how to stop this 224.0.0.1 / all-systems.mcast.net traffic?

Thanks

Last edited by robolux; 11-06-2016 at 06:42 PM.
 
Old 11-07-2016, 09:47 AM   #2
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