Re: [B.A.T.M.A.N.] [PATCHv2 2/2] batman-adv: Snoop DHCPACKs for DAT

Antonio Quartulli
2016-07-08T00:33:02Z

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On Thu, Jul 07, 2016 at 03:40:52PM +0200, Linus Lüssing wrote:
> On Thu, Jul 07, 2016 at 12:14:42PM +0200, Linus Lüssing wrote:
> > Hi Antonio,
> >
> > > have you tried applying this patch on one of your servers and measure the local
> > > effect? (i.e. if the number of BRD ARP req is reduced or not?)
> >
> > I had queried Martin Weinelt just yesterday, they will test it on
> > a 500 nodes compat-v15 setup soon :).
>
> Unfortunately, looks like this patch has no effect regarding the
> ARP Request overhead. According to batctl log, DHCPACKs are
> snooped, but still 84.3% of all ARP Requests come from the three
> DHCP servers / gateways.
>
> These ARP Requests come encapsulated in a batman-adv broadcast
> packet type.
>
> Hm, anyone having another idea what might still be causing these
> ARP Requests?

have you tried enabling DAT debug and observing step by step what happens ? You
could try to study a simple case: i.e. an unknown client that comes and
connects for the first time..you can save the full log somewhere and then we can
all have a look (knowing the MAC address of this client)

Cheers,

--
Antonio Quartulli

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