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Date:      Wed, 30 Nov 2011 18:55:59 +0100
From:      Damien Fleuriot <ml@my.gd>
To:        bsd <bsd@todoo.biz>
Cc:        "freebsd-questions@FreeBSD.org" <freebsd-questions@FreeBSD.org>
Subject:   Re: Problem with jail network
Message-ID:  <4ED66E2F.4000401@my.gd>
In-Reply-To: <B4E27F22-FD26-4030-9BEB-FA4A486B971C@todoo.biz>
References:  <3EE6B227-24EC-4600-AF04-BEE7A04677FB@todoo.biz> <4ED65705.8020503@my.gd> <5B932D73-456D-4895-BD8B-9BABAD7AE766@todoo.biz> <4ED66992.9010207@my.gd> <B4E27F22-FD26-4030-9BEB-FA4A486B971C@todoo.biz>

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On 11/30/11 6:52 PM, bsd wrote:
> Le 30 nov. 2011 à 18:36, Damien Fleuriot a écrit :
> 
>>
>>
>> On 11/30/11 6:29 PM, bsd wrote:
>>> Le 30 nov. 2011 à 17:17, Damien Fleuriot a écrit :
>>>
>>>>
>>>>
>>>> On 11/30/11 5:05 PM, bsd wrote:
>>>>> Hi, 
>>>>>
>>>>> I have been configuring a jail system using the howto provided here : http://www.freebsd.org/doc/handbook/jails-application.html
>>>>>
>>>>> The is now correctly starting, but I can't seem to use the network stack. 
>>>>>
>>>>>
>>>>>> root@master 16:52:55 ~ -> jls
>>>>>> JID  IP Address      Hostname                      Path
>>>>>> 1  xx.216.yy.150  n0.no.no                    /jail/j/n0
>>>>>
>>>>>
>>>>> But I can't ping neither outside of the jail, nor inside of It. 
>>>>>
>>>>> I am a bit confused because I don't know if I have to configure the IP using an alias on the main Eth interface, or do something else. 
>>>>>
>>>>>> ifconfig_bce0_alias0="inetxx.216.yy.150/32"
>>>>>
>>>>>
>>>>>
>>>>> This last command seems to have frozen my system. 
>>>>>
>>>>
>>>> Confirm that the MISSING SPACE between your "inet" and "xxx.216..."
>>>> statements is only a typo and NOT present in your actual rc.conf
>>>>
>>>
>>> This is confirmed. 
>>>
>>> I have the equivalent of : 
>>>
>>> ifconfig_bce0_alias0="inet 1.2.3.4/32"
>>>
>>
>> AFAIK, unless you allow raw sockets, you will not be able to ping from
>> the jail.
>>
>>
>> Find below the conf I successfully used, a long time ago, for a jail
>> hosting DNS.
>>
>> This is from my rc.conf on the host system.
>>
>>
>>
>>
>> ### JAILS
>> jail_enable="NO"
>> jail_set_hostname_allow="NO"
>> jail_list="ns"
>> jail_ns_interface="lo53"
>> jail_ns_ip="192.168.0.53,2001:41d0:2:613b::53/56"
>> jail_ns_hostname="ns.my.gd"
>> # fec0:[interface index]::[damien fleuriot]:[interface number]
>> # example: fec0:5::df:252 for loopback interface lo252
>> jail_ns_rootdir="/var/jail/ns"
>> jail_ns_devfs_enable="YES"
>> #jail_ns_devfs_ruleset="devfsrules_jail_ns"
>>
>>
>> You will notice this creates a lo53 (loopback) interface with private
>> IPv4 and IPv6 addresses.
>>
>> I then used PF to redirect DNS queries to this jail.
> 
> I don't want the IP to be redirected, I would like the jail to have It's own IP. 
> Redirection would probably involve a NAT on your main IP to the IP of the jail, which is something I would like to avoid. 
> 
> 
> Did you use something like the aforementioned ifconfig alias to give the IP to your jail ? 
> 
> ifconfig_bce0_alias0="inet 1.2.3.4/32"
> 
> 
> What bothers me is that I am not able to ping from the outside either… ?? 
> 
> And I can't install any ports because I don't have any network available inside the jail. 
> 
>

Nope, I used the loopback interface.


Again, for pings to work, AFAIK, you need to enable raw sockets within
the jail.

security.jail.allow_raw_sockets=1



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