Route only ssh traffic through VPN
6,196
My answer is related to the answer of related, but more complicate question and not tested.
You need the iproute2
package installed.
Add to /etc/iproute2/rt_tables
the line
200 vpn-route
and then write a script that you call after VPN is initialized:
# set default gateway of vpn-route
ip route add default via $VPNGATEWAY dev $VPNINTERFACE table vpn-route
# use this for marked packages
ip rule add fwmark 0x1 table vpn-route
# mark outgoing ssh packages
iptables -t mangle -A OUTPUT -o $WANINTERFACE -p tcp --dport 22 -j MARK --set-mark 1
# rewrite source address
iptables -t nat -A POSTROUTING -o $VPNINTERFACE -j MASQUERADE
Of course, you need to replace the $...
variables with their actual values.
PS: If your IP on the WAN-interface is fix, you can replace the last line with
iptables -A POSTROUTING -t nat -o $WANINTERFACE -p tcp --dport 22 -j SNAT --to $WANIP
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Author by
Anthon
Updated on September 18, 2022Comments
-
Anthon almost 2 years
Is it possible to route a computer's SSH service through a VPN connection but allow ALL other data to exit through the WAN address? What sort of iptables magic needs to be done to accomplish this?
SSH data → goes through VPN
ALL other data → goes through default route