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Re: [patch] Multiple ips for jails

From: "Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>
Date: Tue, 14 Nov 2006 12:21:07 +0100

Joerg Sonnenberger wrote:
On Tue, Nov 14, 2006 at 10:00:54AM +0100, Simon 'corecode' Schubert wrote:
Joerg Sonnenberger wrote:
At least the IPv6 case is incomplete as it doesn't deal with mapped ipv4
addresses. I also don't think the behaviour for INADDR_ANY is correct.
Could you elaborate on that? How should mapped ipv4 addresses be handled? I guess there would need to be a check for already used ipv4 addresses, and vice versa.

If mapped IPv4 addresses are allowed, they should get exactly the same handling as normal IPv4 addresses. Esp. mapped needs to be handled accordingly.

yes, I agree.

What behaviour for INADDR_ANY would be correct? (If you can use this term)

When a socket is allowed to bind to INADDR_ANY two things have to be guarantied: (a) Connections to it are effectively only allowed, when one of the jail IPs can be used. E.g. if the jail is bound to and, but the machine has also as IP, a connection to that must not go to the jail. (b) Connections *from* the jail must use one of the jail addresses as source. E.g. when the jail is bound to as before, a connection to must not use as soure address.

as far as i can tell, the patch was designed to do exactly what you are describing.

This gets further complicated by the question whether or not binding to
broadcast and/or multicast addresses should be enabled by default.

I don't know how this is handled at the moment, but I am confident that this could even be handled when the code is committed. As long as the old behaviour persists with just one IP, it is fine.


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