• iptables -t mangle -A OUTPUT -p tcp --dport 5190 -j MARK --set-mark 5190
•  
• echo "5190 vpn.IM" >> /etc/iproute2/rt_tables
• echo 0 > /proc/sys/net/ipv4/conf/tun0/rp_filter
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• ip ru add fwmark 5190 table vpn.IM
• ip route add default via 10.255.0.1 dev tun0 table vpn.IM
• ip route flush cache