netdev - RE: What's the right way to use a *large* number of source addresses?

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Message-ID: <DUB123-W366C1804B97909DA64C0F9ED3E0@phx.gbl>
Date:	Fri, 23 May 2014 12:49:24 +0200
From:	Lukas Tribus <luky-37@...mail.com>
To:	Florian Westphal <fw@...len.de>,
	Niels Möller <nisse@...thpole.se>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Jonas Bonn <jonas@...thpole.se>
Subject: RE: What's the right way to use a *large* number of source
 addresses?

>> 3. Just set the desired local address with the bind call. Currently,
>> this gives an EADDRNOTAVAIL error, so the first step would be some
>> option to allow arbitrary source addresses.
>
> See 'Making non-local sockets work' in Documentation/networking/tproxy.txt


Yes, its a simple as setting IP_FREEBIND and then binding to the specific
source IP.

setsockopt(fd, SOL_IP, IP_FREEBIND, &one, sizeof(one))


You don't need to specify the interface. Just make sure your network
routes the return traffic back to your box.

Works for IPv6 as well (3.3+).



Lukas

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