Date: Fri, 10 Apr 2009 14:00:48 +0000 (UTC) From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: JAKO Andras <jako.andras@eik.bme.hu> Cc: freebsd-jail@freebsd.org Subject: Re: lo0's IPv6 address overwritten Message-ID: <20090410135647.E15361@maildrop.int.zabbadoz.net> In-Reply-To: <Pine.GSO.4.64.0904101149270.12199@mono> References: <Pine.GSO.4.64.0904101149270.12199@mono>
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On Fri, 10 Apr 2009, JAKO Andras wrote:
> Hi,
>
> Starting a jail with one IPv4 and one IPv6 address on a few days old
> RELENG_7 overwrites lo0's ::1 with the jail's IPv6 address. (The jail's
> addresses are preconfigured on lo1.)
>
> Is this expected behaviour? Or did I made something the wrong way?
>
> Here's ifconfig(8)'s output before and after executing jail(8), and also
> from inside of the jail.
testing this on a bit older HEAD:
ifconfig lo1 create inet6 2001:738:2001:1000::2/128
ifconfig lo0 ; ifconfig lo1
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
options=3<RXCSUM,TXCSUM>
inet 127.0.0.1 netmask 0xff000000
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
lo1: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
options=3<RXCSUM,TXCSUM>
inet6 2001:738:2001:1000::2 prefixlen 128
jail -l -U root -i / hostname "2001:738:2001:1000::2" /bin/sh
1
# sysctl security.jail.jailed
security.jail.jailed: 1
# ifconfig lo0; ifconfig lo1
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
options=3<RXCSUM,TXCSUM>
lo1: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
options=3<RXCSUM,TXCSUM>
inet6 2001:738:2001:1000::2 prefixlen 128
[ another xterm ]
bz@:~> sysctl security.jail.jailed
security.jail.jailed: 0
bz@:~> ifconfig lo0 ; ifconfig lo1
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
options=3<RXCSUM,TXCSUM>
inet 127.0.0.1 netmask 0xff000000
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
lo1: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
options=3<RXCSUM,TXCSUM>
inet6 2001:738:2001:1000::2 prefixlen 128
..
ifconfig lo1 destroy
I wonder what's going onfor you. Can you check with
netstat -rn -f inet6
that what you are seeing is indeed true?
Can you try starting the jail to get an interactive shell and not
running any scripts like I did and check what happens then?
/bz
--
Bjoern A. Zeeb The greatest risk is not taking one.
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