Question on a NAT traversal requirement

Kevin Boyle kboyle at nortel.com
Tue Aug 22 11:55:33 EDT 2006


>From my reading of this, the system requires at least H.323v3.  H.323v1
and v2 are inadequate.

Note that the other specs are subject to different version requirements:
H.245 must be at least v7, for example.

Kevin

-----Original Message-----
From: cathy jiang [mailto:jiangxiaolin at mail.ritt.com.cn] 
Sent: Tuesday, August 22, 2006 5:19 AM
To: OKUBO Sakae
Subject: RE: Question on a NAT traversal requirement

Mr.Okubo,

>From this sentence you quoted, it means that NAT/FW traversal schemes
should consider at least V3 and also should have the abilities to adapt
to the later versions, i.e. v4,v5 and v6. There might have some legacy
networks  deployed with h.323 v1/v2 which should be taken into
cosideration of NAT/FW traversal.But it was not implied here that NAT/FW
traversal MUST support v1/v2.

Best
Xiaolin

 
  
======= At 2006-08-22, 16:25:30 you wrote: =======

>Mr. Okubo,
>
>This statement is there since the in order to allow solutions that will

>require the extensibility framework and generic parameters defined only

>from those versions.
>This means that any version from this version and above will work. It 
>also means that NAT traversal may work with older systems using other 
>NAT traversal mechanisms like Session Border Controllers or ALGs
>
>Roni Even
>
>> -----Original Message-----
>> From: OKUBO Sakae [mailto:okubo at MXZ.MESH.NE.JP]
>> Sent: Tuesday, August 22, 2006 11:10 AM
>> To: itu-sg16 at external.cisco.com
>> Subject: Question on a NAT traversal requirement
>> 
>> Dear NAT traversal experts,
>> 
>> TTC (The Telecommunication Technology Committee) is now working on 
>> Technical Paper "Requirements for Network Address Translator and 
>> Firewall Traversal of H.323 Multimedia Systems" to convert it to a 
>> Technical Report in Japanese language.
>> 
>> I have a question on how to interpret the following part:
>> 
>> ----------
>> 9.3	Requirements on Signalling and Media Streams
>> b)	NAT traversal mechanisms for H.323 multimedia systems shall
>> support no less than ITU-T H.323v3, H.245v7, H.225.0v4, and H.235v3.
>> All later versions of H.323, H.245, H.225.0 and H.235 may be 
>> supported.
>> ----------
>> 
>> Take an example of H.323 that has now v6. Which of the following 
>> statements are true?
>> 
>> NAT traversal
>> 
>> 1/ shall not support v1 or v2.
>> 2/ may support v1 or v2.
>> 3/ shall support v3.
>> 4/ shall support v3 and in addition may support any combinations of 
>> v4, v5 and v6.
>> 5/ shall support v3 and may support v4, or (v4 and v5), or (v4, v5 
>> and v6).
>> 
>> In other words, NAT traversal with the following support conforms to 
>> this requirement:
>> 
>> a/ v3
>> b/ v4
>> c/ v5
>> d/ v6
>> e/ v3, v4
>> f/ v3, v5
>> g/ v3, v6
>> h/ v3, v4, v5
>> i/ v3, v4, v5, v6
>> j/ v4, v5
>> k/ v4, v6
>> l/ v4, v5, v6
>> m/ v5, v6
>> 
>> --
>> Best regards,
>> 
>> OKUBO Sakae
>> e-mail: okubo at aoni.waseda.jp
>>          (<== sokubo at waseda.jp, valid until 31 March 2007) Visiting 
>> Professor Global Information and Telecommunication Institute (GITI) 
>> Waseda University
>> ******************************************************************
>> Waseda University, YRP Ichibankan 312        Tel: +81 46 847 5406
>> 3-4 Hikarinooka, Yokosuka-shi, Kanagawa-ken  Fax: +81 46 847 5413
>> 239-0847 Japan
>>                        H.323 videoconferencing: arranged by advice
>> ******************************************************************
>.

= = = = = = = = = = = = = = = = = = = =
			
cathy jiang
jiangxiaolin at mail.ritt.com.cn
2006-08-22





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