Re: [pcp] New Version Notification for draft-ripke-pcp-tunnel-id-option-01.txt

[Markus Stenberg <[e-mail]>]

On 11.7.2014, at 18.11, [e-mail] wrote:
> Thank you for the clarification. 
> 
> But given that a legacy CPE, even in the bridge mode, does not leak UPnP IGD messages in the WAN interface, I guess an upgrade is still needed to relax that?

If it’s in ~L2 bridging mode, and doesn’t do anything clever (such as bridge-firewalling), why would it not leak UPnP messages on WAN? 

I have CPEs that basically convert media from X to Y (notably, ethernet-ish to something {A,V}DSL-ish), and when they’re in L2 bridging mode, what you stick in from ethernet port, goes on the line, without any clever bits working. If they’re _not_ in bridged mode, all sorts of obvious things happen such as NAT, hop count handling, etc, which would obviously do bad things to UPnP traffic destined to WAN port.

I doubt that any CPE that is _not_ in L2 bridging mode would work with this CGN-side IGD scheme out of the box (given some configuration, yes, but not otherwise).

Cheers,

-Markus

P.S. I consider L2 CPEs good _for advanced users_ and not that great idea as a default. However, I’m sure this draft has it’s place, somewhere.. ;)