DHCP server is not serving as a gateway
If you provision an Airwall Gateway, but do not set the DHCP gateway or IP, the DHCP server won't serve as a Default gateway.
Not specifying a gateway in the DHCP server configuration causes the Airwall DHCP server not to include the DHCP Router option, so the DHCP client does not configure a default gateway.
Solution
Configure the gateway or IP in the DHCP server configuration.:
Note: Not specifying a gateway is a possible, but unusual configuration, and should only
be used when you want to configure a single isolated subnet. For example, a subnet
for networked PDUs that should not have any outside connectivity aside from remote
access through an Airwall Gateway
used in conjunction with SNAT over the Overlay
port group.