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how to create real IP kill switch with IPTABLES on the DDWRT router

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forget about software kill switches, as you can't trust them



in firewall, in ddwrt, put this line




iptables -I FORWARD -s -o $(nvram get wan_iface) -j DROP

this will include from to
no single machine with those internal IPs will be access the net, if VPN is not  up.
this is the real deal, tried and tested, works like a charm
i - insert
FORWARD - for packets being forwarded through the router 
s - source
o - defining interface physical name
$(nvram get wan_iface) - gets the wan interface name
j - jumps to
drop - packets are dropped
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