On 10 February 2015 at 12:55, jg <[email protected]> wrote:
> >> Some firewalls have a 'consistent NAT' option that needs to be enabled, >> otherwise you get the symptoms described. >> >> While reading about NAT, I came across this web site: > http://nattest.net.in.tum.de/ > The test tool looks at various NAT related properties and prints the > results related to TCP/UDP binding properties, TCP/UDP hole punching, etc. > > In my case a very short value was reported for the UDP timeout, such that > depending on the sequence of packets, the entry in the mapping table might > already have been deleted. This could explain the random nature of my > connection problem. Port predictability does not seem to be a problem. > > Does that make any sense? > > jg > > Yes UDP timeout being too short is another thing I've experience with firewalls (admittedly limited and once removed experience). Actually, this one can be a (mild) problem on Draytek routers and can be resolved by telnetting into the router and using the portmaptime command. Also, turn of stateful packet inspection if it is an option. -- Ishfaq Malik Department: VOIP Support Company: Packnet Limited t: +44 (0)845 004 4994 f: +44 (0)161 660 9825 e: [email protected] w: http://www.pack-net.co.uk Registered Address: PACKNET LIMITED, Duplex 2, Ducie House 37 Ducie Street Manchester, M1 2JW COMPANY REG NO. 04920552
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