Re: [B.A.T.M.A.N.] [PATCH 3/4] batman-adv: prevent duplication of ARP replies in BLA setups when DAT does address resolution

[Simon Wunderlich <sw@simonwunderlich.de>]

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On Friday 12 February 2016 14:53:31 Andreas Pape wrote:
> From 2cc1e9eb153d0c2d64cb0fb0747063ba63472925 Mon Sep 17 00:00:00 2001
> From: Andreas Pape <apape@phoenixcontact.com>
> Date: Fri, 12 Feb 2016 13:19:25 +0100
> Subject: [PATCH 3/4] batman-adv: prevent duplication of ARP replies in BLA
> setups when DAT does address resolution
> 
> This patch covers the case of a bla setup with enabled dat if none of the
> common gateways of the
> same backbone has already knowledge of the searched ip address and
> therefore has to ask via DAT some
> of the other mesh nodes. A broadcast arp request is coming
> from the backbone and each backbone gateway starts an address resolution
> via other DAT mesh nodes.
> In this case it should be prevented, that multiple answers from DAT
> enabled mesh nodes reach the
> backbone gateways leading to multiple replies in a common backbone again.

I think this approach and its methods as implented are good. However I think 
we should generalize this case and forbid UNICAST/UNICAST4ADDR between 
backbone gateways, as discussed in the other thread. 

What do you think, or does anyone else have opinions?

@Antonio, in what way would be the DHT in DAT be affected? Basically, we would 
exclude some orginators who are on the same backbone.

Cheers,
     Simon

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