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docs: add package/gluon-ebtables-limit-arp (#1386) 

based on package documentation, authored by T_X 
84a6f65f02/package/gluon-ebtables-limit-arp/Makefile (L18-L39)

fixes #1383
This commit is contained in:
Martin Weinelt 2018-05-17 02:02:15 +02:00 committed by Andreas Ziegler
parent eaa23aeae6
commit b0bfe25274
2 changed files with 24 additions and 0 deletions
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docs/index.rst
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@ -58,6 +58,7 @@ Several Freifunk communities in Germany use Gluon as the foundation of their Fre
package/gluon-config-mode-domain-select
package/gluon-ebtables-filter-multicast
package/gluon-ebtables-filter-ra-dhcp
package/gluon-ebtables-limit-arp
package/gluon-ebtables-source-filter
package/gluon-radv-filterd
package/gluon-web-admin

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docs/package/gluon-ebtables-limit-arp.rst Normal file
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@ -0,0 +1,23 @@
gluon-ebtables-limit-arp
========================
The *gluon-ebtables-limit-arp* package adds filters to limit the
amount of ARP requests client devices are allowed to send into the
mesh.
The limits per client device, identified by its MAC address, are
6 packets per minute and 1 per second per node in total.
A burst of up to 50 ARP requests is allowed until the rate-limiting
takes effect (see ``--limit-burst`` in ``ebtables(8)``).
Furthermore, ARP requests for a target IP already present in the
batman-adv DAT cache are excluded from rate-limiting, in regard
to both counting and filtering, as batman-adv will be able
to respond locally without a burden for the mesh. Therefore, this
limiter should not affect popular target IP addresses, like those
of gateways or nameservers.
However it mitigates the impact on the mesh when a larger range of
its IPv4 subnet is being scanned, which would otherwise result in
a significant amount of ARP chatter, even for unused IP addresses.