[B.A.T.M.A.N.] [RFC PATCH] batman-adv: Increase DHCP snooped DAT entry purge timeout in DHT

Marek Lindner mareklindner at neomailbox.ch
Fri Jul 20 06:06:14 CEST 2018


On Tuesday, 26 June 2018 01:29:19 HKT Linus L├╝ssing wrote:
> 1) Host (A) joins the network and has the IP_X / MAC_a
>    statically assigned.
> 2) Some ARP Requests reaches this host, it issues an ARP Reply
>    which populates the DHT.
> 3) The host leaves the network.
> 3) Another host (B) joins the network with IP_X / MAC_b
>    statically assigned.

Let's distinguish the problems we're trying to solve:

 * Cache consistency during updates: A local DAT cache which is not updated 
during a cache update event, thus needs to time out faster and a global DAT 
cache receiving regular updates with less need to update.

 * Timely cache update: The global cache shall be updated as soon as the 
information is available.

My previous email focused on the former while your response is about the 
latter. Is that your assessment too ?

Both problems require solving to fully support this dynamic environment you 
are describing whilst reducing ARP traffic overhead.

Would you mind commenting on the cache consistency issue ? Antonio will 
respond to your 'snoop outgoing ARP Requests' question separately.

Cheers,
Marek
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