24 lines
993 B
ReStructuredText
24 lines
993 B
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gluon-ebtables-limit-arp
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========================
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The *gluon-ebtables-limit-arp* package adds filters to limit the
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amount of ARP requests client devices are allowed to send into the
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mesh.
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The limits per client device, identified by its MAC address, are
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6 packets per minute and 1 per second per node in total.
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A burst of up to 50 ARP requests is allowed until the rate-limiting
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takes effect (see ``--limit-burst`` in ``ebtables(8)``).
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Furthermore, ARP requests for a target IP already present in the
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batman-adv DAT cache are excluded from rate-limiting, in regard
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to both counting and filtering, as batman-adv will be able
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to respond locally without a burden for the mesh. Therefore, this
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limiter should not affect popular target IP addresses, like those
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of gateways or nameservers.
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However it mitigates the impact on the mesh when a larger range of
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its IPv4 subnet is being scanned, which would otherwise result in
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a significant amount of ARP chatter, even for unused IP addresses.
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