It would be useful to understand how which NAT algorithm is used,
as I'm wondering if the problems on both AEBS hardware and ISP
routers are caused by their respective NAT implementations.
Every version of the AirPort Extreme and Express base stations (since
the first "snow" products, i.e. not the original "graphite") have
used endpoint-independent mapping and filtering for UDP
translations. They've also supported hairpinning. AirPort base
stations have always been designed expressly to be STUN-friendly.
--
james woodyatt <email@hidden>
member of technical staff, communications engineering