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Re: [BEHAVE] Comments ondraft-bajko-v6ops-port-restricted-ipaddr-assign-02.txt

"Dan Wing" <dwing@cisco.com> Fri, 07 November 2008 23:30 UTC

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From: Dan Wing <dwing@cisco.com>
To: teemu.savolainen@nokia.com
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Date: Fri, 07 Nov 2008 15:29:46 -0800
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Cc: cheshire@apple.com, Gabor.Bajko@nokia.com, behave@ietf.org, dthaler@windows.microsoft.com
Subject: Re: [BEHAVE] Comments ondraft-bajko-v6ops-port-restricted-ipaddr-assign-02.txt
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> -----Original Message-----
> From: behave-bounces@ietf.org 
> [mailto:behave-bounces@ietf.org] On Behalf Of 
> teemu.savolainen@nokia.com
> Sent: Friday, November 07, 2008 4:14 AM
> To: dthaler@windows.microsoft.com; Gabor.Bajko@nokia.com
> Cc: cheshire@apple.com; behave@ietf.org
> Subject: Re: [BEHAVE] Comments 
> ondraft-bajko-v6ops-port-restricted-ipaddr-assign-02.txt

I have two comments:

...
> With our approach also public IPv4 address is allocated to a 
> host (with restrictions), while in NAT-PMP and UPnP IGD 
> cases private IPv4 addresses are used afaik? 

Both NAT-PMP and UPnP IGD allocate an IP address on the 
'public' interface of the NAT (the WAN interface).  Of course 
if there are nested NATs, this doesn't provide a truly public 
IP address because neither NAT-PMP nor UPnP IGD know if the 
NAT's WAN interface is behind another NAT, nor do NAT-PMP or
UPnP IGD describe how they might be nested.  To avoid this
deficiency, one solution is to disable the inner NAT when it
appears to be behind another NAT; this of course creates
other problems.  Disabling the NAT is a requirement to get one 
of the Microsoft certification stickers on a NAT; see "Windows 
Hardware Logo Program Requirements for Devices", requirement 
NETWORK-0076, 
http://www.microsoft.com/whdc/winlogo/hwrequirements.mspx

> Another aspect is that if CGN is used, it most
> probably does not support NAT-PMP or UPNP IGD usage at all,
> and even local NAT is probably having keep-alive timers 
> running that need to be refreshed with battery-consuming 
> keep-alive messages.

For whatever it's worth to mention, I had proposed a STUN-
based technique to reduce UDP keepalives and a related BoF
to discuss the problem and solution.  But it died,
http://tools.ietf.org/id/draft-wing-behave-nat-control-stun-usage-05.txt
(expired)
http://www.ietf.org/mail-archive/web/safe/current/msg00075.html (minutes from
the BoF)

-d

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