route icmp to a different gateway 
echo 100 icmp_route >> /etc/iproute2/rt_tables
ip rule add fwmark 1 table icmp_route
ip route add default via IP_OF_NOT_DEFAULT_GATEWAY dev eth0 table icmp_route

iptables -t mangle -A OUTPUT -d IP_TO_PING -p icmp -j MARK --set-mark 1


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