WAN Interface

• Check that the WAN IP address is correct (Interfaces > WAN)
  • Using the wrong address could cause a failure of the ISP to deliver traffic to/from the firewall, among other issues
• Check that the WAN IP address has the correct subnet mask (Interfaces > WAN)
  • An improper subnet mask such as /1 could cause connectivity issues to large portions of the Internet, using /32 for a mask can prevent the gateway from being found/used

• Check that WAN has a gateway and that the gateway IP is correct (Interfaces > WAN)
  • This will interfere with automatic outbound NAT and route-to/reply-to handling
• Check that the WAN gateway is set as default (System > Routing)
  • Without a default gateway traffic has no exit path
• Check that the WAN gateway shows Online (Status > Gateways)
  • If it is not, verify the WAN settings and gateway settings, or use an alternate monitor IP
• Verify that the defined WAN gateway is actually the default (Diagnostics > Routes)
  • Some other source such as a VPN may have changed the default gateway