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gluon-ebtables-filter-multicast: drop icmpv6 type 128 & 139, drop icmp 

in a layer 2 mesh network, multicast pings cause a lot of traffic in the
network, significantly increasing the 'backgroudn noise' (= Grundrauschen)
and stressing nodes in the network.

this commit blacklists all icmpv4 multicast traffic as well as multicast
icmpv6 echo-requests and node iformation queries. as no application
depending on these types of multicast traffic is known, blacklisting is safe.
This commit is contained in:
Leo Krueger 2015-09-14 23:31:34 +02:00 committed by ohrensessel
parent a6a281f545
commit bc15b6c810
2 changed files with 4 additions and 2 deletions
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1
package/gluon-ebtables-filter-multicast/files/lib/gluon/ebtables/110-mcast-allow-icmp
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@ -1 +0,0 @@
rule 'MULTICAST_OUT -p IPv4 --ip-protocol icmp -j RETURN'

5
package/gluon-ebtables-filter-multicast/files/lib/gluon/ebtables/110-mcast-allow-icmpv6
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@ -1,2 +1,5 @@
rule 'MULTICAST_OUT -p IPv6 --ip6-protocol 0 -j RETURN' -- hop-by-hop
rule 'MULTICAST_OUT -p IPv6 --ip6-protocol ipv6-icmp --ip6-icmp-type echo-request -j DROP'
rule 'MULTICAST_OUT -p IPv6 --ip6-protocol ipv6-icmp --ip6-icmp-type 139 -j DROP'
rule 'MULTICAST_OUT -p IPv6 --ip6-protocol ipv6-icmp -j RETURN'
rule 'MULTICAST_OUT -p IPv6 --ip6-protocol 0 -j RETURN' -- hop-by-hop