Hi Benny,
Benny Prijono wrote:
> On Tue, Apr 22, 2008 at 3:23 PM, Alain Totouom <alain.totouom at gmx.de> wrote:
>> Hi,
>>
>>
>> Helmut Wolf wrote:
>> > Hi Benny,
>> >
>> > In RFC 3489 the situation is not described if we got no response from the alternate server. I think this is a special network
>> > configuration I have tested :-)
>> >
>>
>> IMHO this assertion is not correct.
>> In such a case you might have 3 possible NAT types
>> - a port restricted (Test #1 & #3)
>> - a restricted (Test #1 & #3)
>> - or a symmetric NAT (Test #1)
>>
>> depending on one (Test#1) or two (Test #1 & #3) additional tests you'll have to
>> perform after Test#2 has failed. Please check rfc.3489 page 21 for clarity.
>>
>
> This may not be possible since test 1B failed with no response.
> Perhaps at best what we can do is something like this:
>
> if (test 1B failed with no response) {
> if (test 3 is successful)
> Type=Restricted;
> else
> Type=unknown (can't distinguish between Port Rest. and Symmetric).
> }
>
didn't dig too deep in PJNATH's code by now ;o)
But this is really bizarre since 1A has been successfully passed and 1B is just
the same test using the CHANGED-ADDRESS from the 1A response !?!
Either we have a mis-configured STUN-Server or we should better retry 1A to be
pretty sure the CHANGED-ADDRESS is still the same and the topology hasn't
changed between both requests what is unlikely to be the case!
> What do you think?
>
Your proposal is perfect, another but time consuming approach could be
if (test 1B failed with no response) {
if (test 3 is successful)
Type=Restricted;
else {
if (test 1A is successful) {
if (CHANGED-ADDRESS from 1. Test 1A == CHANGED-ADDRESS from 2. Test 1A *OR*
test 1B with CHANGED-ADDRESS from 2. Test 1A failed with no response)
Type=unknown (can't distinguish between Port Rest. and Symmetric)
else {
if (ip is the same ) {
type = symmetric;
} else {
type = port restricted;
}
}
} else {
Type=unknown (voodoo network)
}
}
}
But i would rather go for your proposal
Cheers
Alain
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