Date: Wed, 28 Aug 2013 10:42:04 +0100 From: Frank Leonhardt <frank2@fjl.co.uk> To: freebsd-questions@freebsd.org Subject: Re: Jail with public IP alias Message-ID: <521DC5EC.1010701@fjl.co.uk> In-Reply-To: <CA%2BdWbmb6VqmjQAiEyLmsE_%2BP8bHNZxf_Yff7BZAzdDEM3Ka4SA@mail.gmail.com> References: <CAHieY7Sq5XKFuwp9PYnbuLAM6i=6KrrS8h-RM2uJUCzgAQ5rcw@mail.gmail.com> <CAHieY7QnkKv3st31tFHipd7q1jZ1YnFAXizQvgFKjH4oPc5Hsw@mail.gmail.com> <CA%2BdWbmYDfNNAv1kV=68eGQ8ySs9G07TZz_6zE0Fkit5t40484g@mail.gmail.com> <CAHieY7ROHTret4QgCfgUaO5t1HwPzoi8O%2B85y7KKjCW=haoGmg@mail.gmail.com> <CA%2BdWbmb6VqmjQAiEyLmsE_%2BP8bHNZxf_Yff7BZAzdDEM3Ka4SA@mail.gmail.com>
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On28/08/2013 00:19, Patrick wrote: > On Tue, Aug 27, 2013 at 3:42 PM, Alejandro Imass <aimass@yabarana.com> wrote: >> On Tue, Aug 27, 2013 at 6:28 PM, Patrick <gibblertron@gmail.com> wrote: >>> That's not the behaviour I see. My jail has a private and public IP. >>> >> Hi Patrick, thanks for your reply. >> >> The issue is actually more basic and it's because the same network >> card has multiple IPs on the same subnet so the routing table always >> chooses the primary IP assigned to that interface. >> >> I'm trying to figure out if I can fix it in the routing table or will >> need IPFW to re-write the source address. >> >> Thanks, >> >> -- >> Alejandro Imass > Hi Alejandro, > > That's how I've got things setup, too, but I'm not seeing the same > behaviour. So I was wondering if there was something different about > your setup such as using NAT to allow a jail with a private IP to > access the internet at large. > > Patrick > > > (Tidied up so all now bottom posted) I can confirm that you shouldn't be seeing this behaviour because I don't. I don't use EzJail - i prefer "vi". Seriously, setting up a jail is very straightforward anyway, and when I tried ezjail I found it was doing stuff I didn't like, so dropped it early on. It was a long time ago and I've forgotten the specifics. I guess if you're using it your new to this particular game, so please excuse me pointing out a few basics here. Although I can't exactly see how this would cause a problem, remember that many service will bind to ALL IP addresses when they start up, and if they pinch a port any subsequent jail trying to take the same one will fail. For SSH, edit /etc/ssh/sshd_config on the "host OS" and set the ListenAddress to the one you want to use instead of the default, which means all of them. I can't see a mechanism that would get the results you're seeing, but I don't know what ezjail might be doing. I suspect your problem is with ezjail or something bizzare on your network config; can you try it manually? Regards, Frank.
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