By default, it should route to the most specific route possible. If you have a subinterface with an IP and proper Subnet Mask, it should automagically send it to that subinterface and attempt to discover it through an arp request or broadcast. Any IP/Subnet not specified should follow the default route to your gateway. If this isn't working, you can e-mail me off list for some more indepth troubleshooting. ============================ Daniel Rysztak, CCNP http://www.druids-grove.net/ -----Original Message----- From: tclug-list-bounces at mn-linux.org [mailto:tclug-list-bounces at mn-linux.org]On Behalf Of Anton Yurchenko Sent: Tuesday, April 06, 2004 3:43 PM To: TCLUG Mailing List Subject: Re: [TCLUG] Networking/routeing question Jason Sievert wrote: > Close, here is some ascii art to try and describe it. > > |----------------| |-------|(corp lan) > |Privet net | |gateway|(world) > |192.168.123.0/24| <----------> eth0 192.168.123.100|-------|eth1 > |----------------| eth0:0 192.168.0.100 172.16.0.3 > eth0:1 10.0.0.100 > > What I am looking for is when I bring a box in at 192.168.0.101 that > the router will not send that traffic through to the world but will > NAT or route it through the appropriate device. > For example if 192.168.123.2 want to go to google the gateway will nat > it but if it wants to talk to a raid at 192.168.0.101 it will route or > nat that through the gateway. > Jason ok still lost. case 1: host goes to some inet site the linux gateway nats it and sends it to next gateway in 172.16.0 subnet case 2: host goest to some ip in user defined range of neworks and it instead is routed to a gateway in a 192.168.0 subnet? if that is correct then you just need to create static routes for the those subnets that need special handling and point them to the gateway on the 192.168.0 subnet > P.S. I im in way over my head so be gentel :) > > Anton Yurchenko wrote: > >> Jason Sievert wrote: >> >>> Ok all ye networking gurus, I am looking for some information on >>> setting up a gateway/router for my lab at work. I have the basic >>> setup, two network card, one private for the lab and one public for >>> net access and to allow certain computers to get back in. the >>> privet network is NATed when they go for outside access. The >>> internal ip address is at 192.168.123.0/24. Now my question is that >>> when we bring in equipment in from vendors it is normally set up >>> with a default ip address, like 10.0.0.12 or 192.168.0.101. What I >>> would like to do with virtually ip address, routing, or iptables is >>> set up a why that the 192.168.1230/24 net can access the other >>> networks on the same physical segment via this gateway? >>> >> so the way that I understand is that you have some host in internal >> net, going via the linux gateway. but when you bring in some new >> hardware with different IPs you`d like for all you internal hosts to >> use it as a gateway? I hope I got it correctly. >> You can of course change the default gateway on all your hosts, or >> you can add the secondary IP in the subnet of the new hardware, on >> you router internal interface, and point the default gateway to it >> instead of outside. the packets will go to the linux router and from >> it to new hardware and then to outside. >> I hope i got you network topology correctly >> >>> Thanks gang, >>> Jason >>> >>> _______________________________________________ >>> TCLUG Mailing List - Minneapolis/St. Paul, Minnesota >>> http://www.mn-linux.org tclug-list at mn-linux.org >>> https://mailman.real-time.com/mailman/listinfo/tclug-list >>> >> >> >> _______________________________________________ >> TCLUG Mailing List - Minneapolis/St. Paul, Minnesota >> http://www.mn-linux.org tclug-list at mn-linux.org >> https://mailman.real-time.com/mailman/listinfo/tclug-list > > > _______________________________________________ > TCLUG Mailing List - Minneapolis/St. Paul, Minnesota > http://www.mn-linux.org tclug-list at mn-linux.org > https://mailman.real-time.com/mailman/listinfo/tclug-list > _______________________________________________ TCLUG Mailing List - Minneapolis/St. Paul, Minnesota http://www.mn-linux.org tclug-list at mn-linux.org https://mailman.real-time.com/mailman/listinfo/tclug-list _______________________________________________ TCLUG Mailing List - Minneapolis/St. Paul, Minnesota http://www.mn-linux.org tclug-list at mn-linux.org https://mailman.real-time.com/mailman/listinfo/tclug-list