I have read this draft and do not support it as-is.
I do not agree with the conclusion that extending RA with a new option
for SIP is necessary nor desirable.
IMVHO:
1. There are other mechanisms available. DHCPv6 is not mandatory in the
IPv6 node requirements, but neither is SIP. Adding a new RA option would
mean firmware in mobile devices would have to be updated, just as they
would if incorporating a DHCPv6 client, so that's a wash.
2. An FQDN has an indeterminate length, although encoding of an FQDN in
RFC1035 limits this to 255 octets, it's still potentially a significant
increase in the length of RA messages, which is undesirable for many
reasons (including stateless security filtering mechanisms like RA-Guard).
3.There's no padding specified on the FQDN encoding. AFAIK RFC1035 does
not specify how to encode an FQDN into 8 octet blocks (required for RA
options length calculations).
4. You can hardly talk about advantages of using an RA option rather
than an alternative unicast mechanism on a point to point bearer link
(where no other nodes can listen out for the broadcast/multicast
information to save on multiple transmissions). The end node still also
has to resolve the FQDN into one or more IPv6 or IPv4 addresses via DNS
before it can transmit any SIP messages, so it's not exactly a RTT start
up latency or packet saver either.
Or am I missing something?
regards,
RayH
mohamed.boucad...@orange.com wrote:
Dear all,
Comments are more than welcome.
Cheers,
Med
-----Message d'origine-----
De : i-d-announce-boun...@ietf.org [mailto:i-d-announce-boun...@ietf.org] De la
part de internet-dra...@ietf.org
Envoyé : jeudi 4 octobre 2012 09:12
À : i-d-annou...@ietf.org
Objet : I-D Action: draft-boucadair-6man-sip-proxy-01.txt
A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : IPv6 RA Option for SIP Proxy Server
Author(s) : Mohamed Boucadair
David Binet
Filename : draft-boucadair-6man-sip-proxy-01.txt
Pages : 6
Date : 2012-10-04
Abstract:
This document specifies a new optional extension to IPv6 Router
Advertisement messages to advertise SIP Proxy Server (e.g., P-CSCF)
addresses to IPv6 hosts.
The provisioning of the SIP Proxy Server address is crucial for the
delivery of SIP-based services. Means to ensure reliable delivery of
this information to connecting SIP User Agents is a must.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-boucadair-6man-sip-proxy
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-boucadair-6man-sip-proxy-01
A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=aft-boucadair-6man-sip-proxy-01
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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