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Special Forums IP Networking How to route all incoming packets from one virtual interface? Post 302879489 by neutronscott on Thursday 12th of December 2013 04:25:33 PM
Old 12-12-2013
I assume you're using Linux?

Quote:
Linux implements a weak host model: even if an address is configured on a given interface, this does not guarantee that packets generated on the host with that address as source will leave the host by that interface. Simply put, the destination IP address of the packet is used as the main key to select the best available route (gateway, interface) from the routing table.
You can make this happen using Linux Policy Routing. I've messed with this when I had two Internet connections and it can be a headache.

Here is a howto I found with Google that explains the steps I think you need: A Quick Introduction to Linux Policy Routing
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routes(4)						     Kernel Interfaces Manual							 routes(4)

NAME
routes - Specifies Internet routing information to the routing tables SYNOPSIS
/etc/routes DESCRIPTION
Static routes can be defined in the /etc/routes file. The /etc/routes file identifies static routes that are automatically added to the network routing tables with the /usr/sbin/route add command. The /sbin/init.d/route script contains the /usr/sbin/route add command that is executed for each entry in the /etc/routes file when the network is restarted on the system or the system is rebooted. The general format of an entry in the /etc/routes file is: Dest Name1 Name2 The following is a brief description of each element in an /etc/routes file entry: A keyword that indicates whether the route is to a net- work or to a host. The two possible keywords are -net and -host. The name or address of the destination network or host. Name1 can be either a symbolic name (as used in the /etc/hosts or /etc/networks file) or an Internet address specified in dotted-decimal format. The name or address of the gateway host to which messages should be forwarded. Name2 can be either a symbolic name (as used in the /etc/hosts file) or an Internet address specified in dotted-decimal format. The routes file is a Context-Dependent Symbolic Link (CDSL) and must be maintained as such. See the System Administration manual for more information. EXAMPLES
To specify a route to a network through a gateway host with an entry in the /etc/routes file, enter: -net net2 host4 This example specifies a route to a network, net2, through the gateway host4. To specify a route to a host through a gateway host with an entry in the /etc/routes file, enter: -host host2 host4 This example specifies a route to a host, host2, through the gateway host4. To specify a route to a default gateway host with an entry in the /etc/routes file, enter: default 130.9.0.5 This example specifies a route to a default gateway with an Internet address of 130.9.0.5. FILES
Contains the /usr/sbin/routed add command. RELATED INFORMATION
Commands: route(8) Daemons: gated(8), routed(8) Files: gated.conf(4) Network Administration delim off routes(4)
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