On Tue, 2003-08-26 at 07:58, Rik Thomas wrote: > On Mon, 2003-08-25 at 06:24, Jason Dixon wrote: > > On Sun, 2003-08-24 at 23:35, Rodolfo J. Paiz wrote: > > > At 8/24/2003 19:48 -0700, you wrote: > > > >Question, i have a server that i would like to use > > > >two nics. i have two ips that are on the same subnet > > > >and they both have the same default route. > > > > > > > >how do i tell traffic that comes to one ip that is assigned > > > >to eth0 to go back through eth0 and one ip that is assigned > > > >to eth1 to go back trhoug eth1 when it goes back out to the > > > >net ? > > > > > > I'm no expert, but... AFAIK, you don't. AFAIK, you can't. > > > > > > You can only have one default route, and that route points to one > > > interface. Most people try to have two Ethernet cards on the same subnet so > > > they can get double the bandwidth, but it simply does not work. If you want > > > double the bandwidth, bond the two interfaces or aggregate them so they act > > > like a single one. If you want to offer some services on one IP and other > > > services on the other IP, realize that you're going to have to find some > > > other way. > > > > Yeah, it's called an alias. You're right, you can't (AFAIK) have two > > interfaces with the same default gateway. If they want to bond the two > > NICs, great. But the only way (IIRC) to get multiple IPs working on the > > same segment is to use aliases (which are easier anyway). > > Let's clear a few things up. > Aliases are on the same NIC, not across multiple NICs unless you are > bonding. Yes you can have two NICs on the same subnet with the same > gateway. Without getting in to the guts of packets and how they work, > the packet itself will "know" how to get back out home. Using a basic > default route, having no other routing on the machine, all packets will > go back out the interface it came in. We do this on countless hosting > machines on our network.
Sorry if my previous comment was ambiguous, but I *know* that an alias only exists on a single NIC. That is the purpose of my suggestion... to explain that to use 2 IPs on the same subnet, you don't have to use 2 dedicated cards, you can simply use aliases. As far as the multiple cards/same gateway argument goes, thanks for clarifying that. Ever notice how a lack of OP information causes confusion that increases proportionately to the length of the thread? ;-) -- Jason Dixon, RHCE DixonGroup Consulting http://www.dixongroup.net -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED] https://www.redhat.com/mailman/listinfo/redhat-list
