On Wed, 2004-08-25 at 16:14, Les Mikesell wrote: > On Wed, 2004-08-25 at 16:02, Jeff Vian wrote: > > > And if anyone > > > is listening that might fix this, please also add a straightforward > > > way to control the source address used for outbound connections when > > > a machine is given multiple addresses on the same subnet for virtual > > > hosting. > > > > > > > > if your system has several IP addresses added as aliases on a single > > interface/subnet, the routing table will provide the 'source' addresses > > for outgoing communications. > > > > if for example you have 4 IP addresses assigned as follows > > eth0 192.168.2.1 > > eth0:1 192.168.2.2 > > eth0:2 192.168.2.3 > > eth0:3 192.168.2.4 > > > > Then the routing table will work as: > > > > 192.168.2.0 * 255.255.255.0 U 0 0 0 eth0 > > the source will be 192.168.2.1 > > 192.168.2.0 * 255.255.255.0 U 0 0 0 eth0:1 > > the source will be 192.168.2.2 > > 192.168.2.0 * 255.255.255.0 U 0 0 0 eth0:2 > > the source will be 192.168.2.3 > > > > etc. > > Suppose you originate a connection to another network and > your router is at 192.168.2.254. Any of those addresses would > work as the source. Does it pick the 1st, last, or at random? NOTE: I specified what had to be in the routing table, and AFAIK only one of those can be there. I believe that any config except the first would require some manual manipulation of the routing table. > There was a variable called NOALIASROUTING in the config files > when I looked long ago but I never found any documentation > about what it was supposed to do or if there was a way to set > it other than mucking around in the stuff under /etc/sysconfig. > That option would prevent the config I mention above and AFAIK would ensure the source would always be the default base device IP. > --- > Les Mikesell > les@xxxxxxxxxxxxxxxx > >
