External network routing table configuration
From ESS-WIKI
If you cannot connet to external network, you may try below routing table configuration.
route add default gw 172.22.31.127
route add default gw 172.22.31.254
route add -net 172.0.0.0 netmask 255.0.0.0 gw 172.22.31.254 dev eth0
route add -net 207.0.0.0 netmask 255.0.0.0 gw 172.22.31.254 dev eth0