NATwatcher

Discover how your NAT is working

Multiple tests are executed in order to check all the functionalities of your NAT

Link to the features below

UDP, TCP and ICMP communication protocols are checked!

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NAtwatcher does 17 tests in order to check the behaviour of your inHome NAT

UDP	TCP	ICMP
Mapping behaviour	Mapping behaviour	If the NAT allow the ICMP request reply traffic
Filtering behaviour	Filtering behaviour	Support for ICMP Destination Unreachable that come from the outside
Does the NAT preserve the original port?	Does NAT's mapping resist ICMP packets?	Support for Destination Unreachable and Time Exceeded packets
Hairpinning behaviour for UDP	Hairpinning behaviour for TCP	Hairpinning behaviour for ICMP error packets
NAT's support of receiving out of order packets		Does the NAT preserve the original port?
If the NAT has a mapping lifetime over 2 minutes
If mapping lifetime is renewed by outgoing packets
Supporting the "not fragment flag"