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From: Thomas Gelf (vserver_at_gelf.net)
Date: Mon 01 Mar 2004 - 08:00:12 GMT

Hi all,

what about offering the vserver user (=administrator) to select between
two possible ways of using networking:

- first, the traditional way: interface aliases, allowing maximum per-
formance with the limitation that vserver's root should either be very
trustful or "a little bit" limited in his networking possibilities.
This is no problem for companies using vserver as an easy to implement
"warm-stand-by"-solution - being root on both the vserver and the host
server. but it IS a problem for webhosting companies offering "virtual
root servers" as there customers will often run into trouble, getting
angry about things not working the way they like it.

- second, the in my opinion easiest way to offer full access to a
network interface: giving the vserver full access to only one or to a
small set of interfaces on the host (not aliases). a simple way to do
this would be, as stated before, using a virtual bridge inside the
host server, tun/tap devices (one or more for each vserver) and a small
modification to the vserver patches allowing to give a vserver limited
view and full access to one or more the hosts interfaces - nothing more.
something like this will be the only "non-very-intrusive" solution to
allow full network support inside a vserver. everything else would mean
hard work to implement some wicked workaround to separate per context
networking - probably creating security problems.

is it a big problem to implement the second way (in addition to the
currently working first one)? herbert? (I haven't been here this weekend
so no irc - sorry).

vserver administrator would have the choice of which solution the would
use, may be even for different vservers on the same host. the only thing
that still remains: virtual loopback support...


Thomas Gelf <vserver_at_gelf.net>

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