Message: 2
Date: Fri, 12 Aug 2011 18:02:20 +0200
From: Antonio Quartulli<or...@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.gb22...@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, gto...@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_ma...@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_ma...@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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