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From Yann Ylavic <>
Subject Re: [PATCH] Add "FreeListen" to support IP_FREEBIND
Date Tue, 08 Mar 2016 09:36:35 GMT
On Mon, Mar 7, 2016 at 12:41 PM, Jan Kalu┼ża <> wrote:
> This is needed for httpd startup with systemd when one wants to use
> particular IP address to bind. There is no way how to start httpd after the
> IP address has been configured in systemd and according to systemd
> developers, the applications should become more robust to handle network
> changes like that. The full reasoning is explained here [1].

Another use case is keepalived (VRRP) where the IPs are set by the
daemon when needed (eg. fail-over), and hence not always available at
It may be worth mentioning in the docs that this new feature would
help in such case, and could replace settings like sysctl's
net.ipv[46].ip_nonlocal_bind which are system (or at least network
namespace) wide.


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