Re: IPv4 addresses clash / jails not working after reboot…

Boris Samorodov bsam at
Fri Mar 8 07:48:49 UTC 2013

08.03.2013 03:22, Jamie Gritton пишет:

> You're allowed to have the same address in multiple jails, but only in
> the case of jails that have one address (i.e. one IPv4 address in this
> case). Jails with multiple IP addresses can't share any of those
> addresses with other jails. I don't know why it should work once and
> then not work later though.

>From JAIL(8):
     Jails have a set a core parameters, and kernel modules can add
their own
     jail parameters.  The current set of available parameters can be
     retrieved via “sysctl -d security.jail.param”.  Any parameters not set
     will be given default values, often based on the current environment.
     The core parameters are:
             It is only possible to start multiple jails with
             the same IP address, if none of the jails has more than
this sin‐
             gle overlapping IP address assigned to itself.

My interpratation of the mannual page is: this restrict is valid only
when ip4.addr sysctl is used. Otherwise this restriction should be
documented at other section (say, at DESCRIPTION).

WBR, Boris Samorodov (bsam)
FreeBSD Committer, The Power To Serve

More information about the freebsd-jail mailing list