Next hop is blackhole; that is, the next hop either does not exist or is
not running.
NextHopIlb
Next hop is the forwarding rule of an Internal Load Balancer.
NextHopInstance
Next hop is a Compute Engine instance.
NextHopInterconnect
Next hop is an interconnect.
NextHopInternetGateway
Next hop is an internet gateway.
NextHopIp
Next hop is an IP address.
NextHopNetwork
Next hop is a VPC network gateway.
NextHopPeering
Next hop is a peering VPC.
NextHopVpnGateway
Next hop is a VPN gateway. This scenario only happens when tracing
connectivity from an on-premises network to Google Cloud through a VPN.
The analysis simulates a packet departing from the on-premises network
through a VPN tunnel and arriving at a Cloud VPN gateway.
