netdev - Re: UDP packets arriving on wrong sockets

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Date:   Thu, 2 Aug 2018 11:21:41 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     shum@...ndrew.org, Network Development <netdev@...r.kernel.org>
Subject: Re: UDP packets arriving on wrong sockets

On Thu, Aug 2, 2018 at 9:21 AM Eric Dumazet <eric.dumazet@...il.com> wrote:
>
>
>
> On 08/02/2018 02:05 AM, Andrew Cann wrote:
> > Hi,
> >
> > I posted this on stackoverflow yesterday but I'm reposting it here since it got
> > no response. Original post: https://stackoverflow.com/questions/51630337/udp-packets-arriving-on-wrong-sockets-on-linux
> >
> > I have two UDP sockets bound to the same address and connected to addresses A
> > and B. I have two more UDP sockets bound to A and B and not connected.
> >
> > This is what my /proc/net/udp looks like (trimmed for readability):
> >
> >       sl  local_address rem_address
> >      3937: 0100007F:DD9C 0300007F:9910
> >      3937: 0100007F:DD9C 0200007F:907D

You have two sockets bound to the same address and port? Is this using
SO_REUSEPORT?