CheckCaptivePortal checks if a captive portal is present.

CheckDefaultRoute checks if the default route is reachable.

CheckNameserverAvailability checks if a nameserver is reachable using DNS.

CheckReachabilityWithICMP checks if a host is reachable using ICMP.

GetCloudflareEdgeTrace returns the edge POP.

GetDefaultNameserver returns the default nameserver.

GetSkkMoeTrace returns the edge POP.