2023-05-01 19:25:33 +00:00
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gluon-nftables-filter-multicast
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2015-11-22 23:39:32 +00:00
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===============================
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2023-05-01 19:25:33 +00:00
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The *gluon-nftables-filter-multicast* package filters out various kinds of
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2015-11-22 23:39:32 +00:00
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non-essential multicast traffic, as this traffic often constitutes a
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disproportionate burden on the mesh network. Unfortunately, this breaks many useful services
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(Avahi, Bonjour chat, ...), but this seems unavoidable, as the current Avahi implementation is
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2015-11-23 12:11:26 +00:00
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optimized for small local networks and causes too much traffic in large mesh networks.
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2015-11-22 23:39:32 +00:00
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The multicast packets are filtered between the nodes' client bridge (*br-client*) and mesh
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interface (*bat0*) on output.
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The following packet types are considered essential and aren't filtered:
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* ARP (except requests for/replies from 0.0.0.0)
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* DHCP, DHCPv6
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* ICMPv6 (except Echo Requests (ping) and Node Information Queries (RFC4620)
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* IGMP
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In addition, the following packet types are allowed to allow experimentation with
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layer 3 routing protocols.
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* Babel
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* OSPF
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* RIPng
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The following packet types are also allowed:
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* BitTorrent Local Peer Discovery (it seems better to have local peers for BitTorrent than sending everything through the internet)
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