The reason I was thinking about this is that if it was NOT included in the RRQ/GRQ, and the gatekeeper would be force to use the source IP address for any other messages (from GK to GW), the same as if it had been explicitly indicated in the GRQ/RRQ, then it would be possible to use a gatekeeper on one side of a NAT while both endpoints are on the other side. I guess not.

Thanks Terry.

-----Original Message----- From: Terry L Anderson [mailto:tla@LUCENT.COM] Sent: Friday, April 13, 2001 6:31 AM To: ITU-SG16@mailbag.cps.INTEL.COM Subject: Re: ras address in RRQ/GRQ

This is of course the opposite of H.248 where replies must go to source address. But remember that there are requests (as opposed to confirms and rejects) that are sent from GK to GW and the GK must know what address to use. If no rasaddress were registered and ARQs (for example) came from various port numbers, the GK would have no idea where to send a DRQ, URQ, IRQ, etc.

rasaddress is not optional in GRQ and so cannot be omitted. It is probably not intended to be optional in RRQ although since it is defined as SEQUENCE OF TransportAddress and SEQUENCES can be of zero length, it is in effect optional. A comment probably should be added to make it required for the above reason.

"Paul E. Jones" wrote:

...

Francois, There is no requirement that RAS messages sent to a Gatekeeper have to be sent from the same port that it will

receive RAS

...

messages. If it is not included, I would expect that the

results will

...

be unpredictable. Some devices will probably assume an address and others will probably just reject the request. Paul

 ----- Original Message -----
 From: Francois Audet
 To: ITU-SG16@mailbag.cps.INTEL.COM
 Sent: Thursday, April 12, 2001 8:17 PM
 Subject: ras address in RRQ/GRQ
  Guys,What is the purpose of the rasAddress in GRQ and
 RRQ?Shouldn't it just be the originating IP address? Is the
 gatekeeper supposed to send the GCF and RCF to IP address
 indicated in the GRQ/RRQ, or is it supposed to send it to
 the source IP address (at the IP layer)?What if the RAS
 address is not included in the RRQ/GRQ?----François AUDET,
 Nortel Networksmailto:audet@nortelnetworks.com, tel:+1 408
 495 3756

--

Terry L Anderson mailto:tla@lucent.com Tel:908.582.7013 Fax:908.582.6729 Pager:800.759.8352 pin 1704572 1704572@skytel.com Lucent Technologies/ Voice Over IP Access Networks/ Applications Grp Rm 2B-121, 600 Mountain Av, Murray Hill, NJ 07974 http://its.lucent.com/~tla (Lucent internal) http://www.gti.net/tla