Date: Wed, 23 Dec 2009 10:24:43 +0000 (UTC) From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Matthew Seaman <m.seaman@infracaninophile.co.uk> Cc: freebsd-hackers@freebsd.org, Mel Flynn <mel.flynn+fbsd.hackers@mailing.thruhere.net>, freebsd-jail@FreeBSD.org Subject: Re: Jail on 2 interfaces? Message-ID: <20091223101938.J86040@maildrop.int.zabbadoz.net> In-Reply-To: <4B31DD99.7000103@infracaninophile.co.uk> References: <200912221734.05795.mel.flynn%2Bfbsd.hackers@mailing.thruhere.net> <4B31DD99.7000103@infracaninophile.co.uk>
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On Wed, 23 Dec 2009, Matthew Seaman wrote: > Mel Flynn wrote: >> Hi, >> >> I don't see this documented in jail(8) nor rc(8) nor defaults/rc.conf, so >> is it possible to have 2 IP's on 2 ethernet interfaces? And if so, is it >> settable for rc(8)? >> >> The usage case is to have the same jailed proxy server on two seperate >> internal networks. Ideally, the proxy will use one address for outgoing, so >> I guess I'll need a default route or dive into the squid config. >> >> At present I have: >> ifconfig_bge0="inet 192.168.177.60 netmask 255.255.255.0" >> ifconfig_em0="inet 192.168.176.60 netmask 255.255.255.0" >> ifconfig_em0_alias0="inet 192.168.176.62 netmask 255.255.255.255" >> jail_squid_rootdir="/usr/squid" >> jail_squid_ip="192.168.177.62" >> jail_squid_ip_multi0="192.168.176.62" >> jail_squid_interface="bge0" >> >> But this created the IP on bge0 even though one exists on em0. Is it as >> simple as not specifying the interface and add the 177.62 alias on bge0? >> Ideally I'd have a jail_$jail_ip_multi$aliasno_interface="foo0", but my >> main worry is that the jail infrastructure understands the routing >> involved. > > To do this directly is now possible in 8.0-RELEASE or better. You will > need a custom kernel with 'options VIMAGE' and I believe the standard jail > startup scripts need a bit of work in order for them to start the jail with > the correct command line arguments to enable the vnet functionality. No, that's wrong. FreeBSD 7.2-R and later can do multi-IP jails and have the IPs on multiple interfaces; there is no need for a dedicated network stack. The routing is no much different than if you would do it in the base system with two IPs. if it works there, just putting it in a multi-IP jail with the adresses on the right interface will just work as well. If you want different routing for a jail use setfib with a multi-FIB based kernel (you may need to recompile the kernel for that) but you still won't need mutliple network stacks. > Alternatively, you can achieve much the same effect that you want by using > a simple one-ip jail and writing firewall rules to redirect traffic into it, > and NAT traffic coming out of it. Using firewall NAT with jails is something I often see and usually never understand unless people only have a single IP and want to share that between lots of jails (though if not duplicate services exist, that will just work as well by default these days as well). -- Bjoern A. Zeeb It will not break if you know what you are doing.
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