Here are some examples on how to configure a WatchGuard Firebox with information from different ISPs. # Comcast P2P IP: `50.218.181.156/30` Gateway: `50.218.181.157` Layer 3 IP: `50.218.181.157` - `50.218.181.158` Usable IP: `50.218.181.160/29` Usable IP Range: `50.218.181.161` - `50.218.181.166` Usable Subnet Mask: `255.255.255.248` ## WatchGuard Configuration External Interface IP: `50.218.181.158/30` Default Gateway: `50.218.181.157` Secondary IPs: - `50.218.181.161/29` - `50.218.181.162/29` - `50.218.181.163/29` - `50.218.181.164/29` - `50.218.181.165/29` - `50.218.181.166/29` # Spectrum Network: `96.36.31.168` Gateway `96.36.31.169` 1st Useable `96.36.31.170` Last Useable `96.36.31.170` Broadcast `96.36.31.171` Subnet Mask `255.255.255.252` ## WatchGuard Configuration External Interface IP: `96.36.31.170/30` Gateway: `96.36.31.169`