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From: Arvid Picciani <aep@exys.org>
To: wireguard@lists.zx2c4.com
Subject: separate allowedips from routing for multipath
Date: Thu, 9 Dec 2021 16:36:17 +0100	[thread overview]
Message-ID: <CACD9L=CAinAO0CHRR25-sEoxCqNp_8BCqU9kJLK-Wzt++oy4bg@mail.gmail.com> (raw)

Hey,

i'm considering using wireguard for a system where there can be
multiple routes to an ip.

The nearest solution i can think of is constantly changing the peer
AllowedIps from userspace and load a large list of routes into it. But
the challenge is that this is used for both routing decisions AND
policy decisions.

let's say we have 3 machines A1, A2, B and a machine that moves around V

V is currently connected via layer2 at A1,
B has V in AllowedIps for peer A1, so that any packet for V is routed to A1

now we connect V to A2 instead
we need to move the AllowedIps entry from A1 to A2 so that a packet
for V is routed to A2
old packets still arriving FROM V through A1 are now dropped

This wouldnt be an issue if AllowedIps could be separated from the
routing decision somehow.

I could have a wg interface per peer so i can do the routing using
regular linux tools, but wg doesnt like reusing the same port for
multiple wg endpoints. We'll eventually run out of ports.

I suppose port reuse is intentionally not allowed?

thanks
Arvid

             reply	other threads:[~2021-12-10 23:01 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-09 15:36 Arvid Picciani [this message]
2021-12-10 23:29 ` Reid Rankin
2021-12-11  7:28   ` Arvid Picciani

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