How to route only specific subnet (source ip) to a particular interface?
I know I can do easily by destination IP by using something like
route add 18.104.22.168/24 dev eth4
but I do not see how can route based on source IP.
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You need to use policy based routing. Something kind of like
ip rule add from <source>/<mask> table <name> ip route add 22.214.171.124/24 via <router> dev eth4 table <name>
<name> is either table name specified in
/etc/iproute2/rt_tables or you can use numeric id ...
This pretty much says, that all traffic from
126.96.36.199/24 will be routed using routing table
<name>. 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.
This site has a nice example of source based routing.