ras address in RRQ/GRQ

Francois Audet audet at NORTELNETWORKS.COM
Fri Apr 13 12:29:54 EDT 2001


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 at LUCENT.COM]
> Sent: Friday, April 13, 2001 6:31 AM
> To: ITU-SG16 at 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 at 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 at nortelnetworks.com, tel:+1 408
> >      495 3756
> >
> --
> ------------------------------------------------------------
> Terry L Anderson              mailto:tla at lucent.com
> Tel:908.582.7013   Fax:908.582.6729
> Pager:800.759.8352 pin 1704572   1704572 at 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
> 
> 
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