[CentOS] Network and default route
Peter Farrow
peter at farrows.orgMon Apr 10 19:40:19 UTC 2006
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Scott Silva wrote: > I have had this problem on and off since RedHat 6, and I always worked through > it, but I thought I would ask. > When you have multiple network interfaces, how does the system determine the > default route? > Or is it the first, (or last) interface that comes up? > > On the problem systems I have to add a "route add default..." statement in > some systems in the rc.local to get them to work right. > > > You can add a default route into /etc/sysconfig/network, and the network with the matching network ip will take the route. If you have more that one default route capability on different interfaces, you can set up routing tables for each of the networks , and then apply a weighting to each network default route in the main routing table... There is an excellent discussion on it here, that answers your later question about sending out packets on the right interface. http://lartc.org/howto/lartc.rpdb.multiple-links.html If you follow the guidlines in this document but only add a default route to your main preferred gateway all traffic outgoing will be routed to that gateway but replies topackets on the other interfaces will still be serviced via the default routes on those interfaces if they come from networks outside the network ranges of all the network interfaces on the box.... If you want more detail, send me your ip ranges and ips and I will send you a set of ip rules/routes to achieve what you want... Regards Pete
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