NG Firewall provides four test methods. In each case, Untangle sends out data packets and decides if the WAN is up or down depending on your specified Testing, Timeout and Failure Threshold intervals:
- Ping Test: NG Firewall will ping the specified IP address.
- ARP Test: NG Firewall will ARP for its gateway.
- DNS Test: NG Firewall will make a request to the upstream DNS server.
- HTTP Test: NG Firewall will make a connection to the specified domain name.