Jails and IP Aliasing
m.seaman at infracaninophile.co.uk
Tue Jul 8 16:35:32 UTC 2008
David Allen wrote:
> There was a post recently (Matthew Seaman's name comes to mind) that
> suggested binding jails to addresses in the loopback range and then
> using firewall rules to redirect the traffic accordingly. There's a
> possibility that may help in this case, but that layer of added
> complexity isn't much of an improvement over seeing connections with
> seemingly identical endpoints and interpreting the results in my head.
Guilty as charged M'lud.
However what I recommended was a more-than-slightly hacky way to achieve
* Something like a loopback address inside the jail. It may be
127.0.0.2 instead of 127.0.0.1 but most software can be persuaded
to use it for loopback style things.
* The ability to map several IPs onto the jailed system by use of
NAT and redirect within firewall rules
* The ability to have a jail with /no/ external IP for when the
paranoia becomes unbearable[*].
Of course, all this will be immediately obsoleted by Marco Zec's work
on virtualizing the IP stack. http://imunes.tel.fer.hr/virtnet/
[*] Combine this with a Hardware Load Balancer that does Direct Server
Return and you can have a publicly accessible jailed server with /no
external IP address/.
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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