netdev - Re: loopback IP alias breaks tftp?

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Date:	Mon, 10 Oct 2011 17:25:24 +0200
From:	Olaf van der Spek <ml@...pek.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Josh Boyer <jwboyer@...hat.com>, Joel Sing <jsing@...gle.com>,
	Julian Anastasov <ja@....bg>, netdev@...r.kernel.org,
	francis.souyri@...c.fr
Subject: Re: loopback IP alias breaks tftp?

On Mon, Oct 10, 2011 at 5:22 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>> Isn't that a bad way to work around this issue?
>> It'd require you to duplicate your IP config for every daemon that
>> listens on UDP interfaces.
>> What about IP addresses that are added/deleted after the daemon is launchad?
>>
>> Olaf
>
> Thats a pretty common problem, even prior to discussed commit.
>
> If you take a look at common UDP daemons, they have to setup a listener
> for each IP address, OR use the correct API ( setsockopt(fd, IPPROTO_IP,
> &on, sizeof(on)) and handle IP_PKTINFO ancillary message)

Only the latter solution seems right.

Olaf
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