linux - How to route only specific subnet (source ip) to a particular
interface?
How to route only specific subnet (source ip) to a particular interface? OS: Linux
I know I can do easily by destination IP by using something like
route add 1.2.3.4/24 dev eth4
but I do not see how can route based on source IP.
Answer
You need to use policy based routing. Something kind of like
ip rule add from / table ip route add 1.2.3.4/24 via dev eth4 table
is either table name specified in /etc/iproute2/rt_tables or you can use numeric id ...
This pretty much says, that all traffic from 1.2.3.4/24 will be routed using routing table . IIRC it doesen't use the default table after going through this, so if you need other routes (ie. default gateway), you need to add them to the table as well.
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