http://www.linuxjournal.com/article/7291 http://tldp.org/HOWTO/Adv-Routing-HOWTO/lartc.rpdb.multiple-links.html might probably help you suomi On 2013-05-01 22:05, Michael Mol wrote: > I'm attempting to configure source-specific routing so that my servers > can exist on multiple subnets from multiple upstream providers. > > A rough diagram of the network layout: > > > ISP1 router (blackbox, routes subnet A, address on subnet A) > \ > -----------eth0(firewall)eth1---((servers)) > / > ISP2 router (blackbox, routes subnet B, address on subnet B) > > The aim is to allow the servers to use both subnet A and subnet B. To > allow this, any machine on both subnets must have source-specific > routing configured, else packets originating from one ISP's AS will be > directed at the other's router, and neither ISP cares for that. > > At the moment, I'm focusing on getting the second ISP properly added to > the firewall box. The firewall box is using CentOS 6.4, and normally > passes traffic back and forth via proxy_arp. None of my interfaces are > NM_CONTROLLED, and NetworkManager is not installed, much less started. > > I've created a route-eth0:1 file that looks roughly like this: > > 10.0.0.1 dev eth0:1 \ > src 10.0.0.2 \ > from 10.0.0.0/29 > > default via 10.0.0.1 dev eth0:1 \ > src 10.0.0.2 \ > from 10.0.0.0/29 > > (Treat indented lines as continuations of the previous line) > (No, the ISPs aren't giving me RFC1918 addresses; these are redacted.) > > If I run "ifup eth0:1", "ip route show" includes the lines: > > 10.0.0.1 dev eth0 scope link src 10.0.0.2 > 10.0.0.0/29 dev eth0 proto kernel scope link src 10.0.0.2 > default via 10.0.0.1 dev eth0 > > > Note that the "from 10.0.0.0/29" clause is missing. With the addition of > a second default route on my firewall/gateway without any restriction on > which traffic should go that way, my whole network, of course, tanks. > > I'm surprised it's been such a pain; I would have expected it to be a > relatively common configuration. What's the proper way of doing > source-specific routing on CentOS? > > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >