Re: [B.A.T.M.A.N.] Multiple DHCP Gateways

[gtolon@inti.gob.ar]

Thank you for your answers. I understood clearly how the system should 
work, but i´m not using the git repository but the 2011.1.0 version. 
I'll try with the repo to see what happens.

Best regards

Gabriel




> Message: 2
> Date: Fri, 12 Aug 2011 18:02:20 +0200
> From: Antonio Quartulli<ordex@autistici.org>
> To: The list for a Better Approach To Mobile Ad-hoc Networking
> 	<b.a.t.m.a.n@lists.open-mesh.org>
> Subject: Re: [B.A.T.M.A.N.] Multiple DHCP Gateways
> Message-ID:<20110812160217.GB22361@ritirata.org.org>
> Content-Type: text/plain; charset=utf-8
>
> Hello and thank you for sharing your gw experience with us,
>
> On Wed, Aug 10, 2011 at 02:52:06PM -0300, gtolon@inti.gob.ar wrote:
>> Hi
> [CUT]
>> However, when the original gateway becomes
>> worse than the alternative, and the client chooses the new one as
>> preferred (observed with batctl gwl) i noticed that the subsequent
>> request DHCP messages are sent to the original server, even if it
>> doesn?t have the best link.
>>
>> I guess that?s because these subsequent DHCP requests are made as
>> Unicast to the original server and so Batman doesn?t redirect them,
>
> Unicast renewal requests are "dropped" only if the TQ towards the destination is
> smaller than the "current_GW_TQ - GW_THRESHOLD" (GW_THRESHOLD = 50).
> To clarify:
>
>
> In your topology you have three nodes: A, B and C. A and C are GWs. A is the
> current best GW for B and B got an IP from the DHCP server running on A. Then
> the link A<-->  B becomes worse than B<-->  C. At this point Batman-adv will
> drop a DHCP unicast renewal request directed to A
>
> if and only if TQ(C) - TQ(A)>  50
>
> Is this condition verified in your topology when your are observing the renewal
> DHCP packets?
>
> I hope I've been clear. :-)
>
>> but
>> i wonder how this behavior affects the network balance, because the
>> computers would get tied always to the original DHCP and IP default
>> gateway even if they moved, right?
>
> As above. Clients will keep the same GW as long as the link is still "usable"
> (difference on TQs greater than 50)
>
>>
>> Thank you very much
>
> Thank you too,
> Antonio
>
>
> ------------------------------
>
> Message: 3
> Date: Fri, 12 Aug 2011 19:22:28 +0200
> From: Marek Lindner<lindner_marek@yahoo.de>
> To: "The list for a Better Approach To Mobile Ad-hoc Networking"
> 	<b.a.t.m.a.n@lists.open-mesh.org>
> Subject: Re: [B.A.T.M.A.N.] Multiple DHCP Gateways
> Message-ID:<201108121922.28786.lindner_marek@yahoo.de>
> Content-Type: Text/Plain;  charset="utf-8"
>
> On Friday, August 12, 2011 18:02:20 Antonio Quartulli wrote:
>> In your topology you have three nodes: A, B and C. A and C are GWs. A is
>> the current best GW for B and B got an IP from the DHCP server running on
>> A. Then the link A<-->  B becomes worse than B<-->  C. At this point
>> Batman-adv will drop a DHCP unicast renewal request directed to A
>>
>> if and only if TQ(C) - TQ(A)>  50
>
> Be aware that only happens if you use the git repository. The "DHCP request
> drop" feature was not released yet.
>
> What version are you using ?
>
> Cheers,
> Marek
>
>
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> End of B.A.T.M.A.N Digest, Vol 56, Issue 15
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