Subject: Re: draft-ietf-6man-rfc6874bis-00.txt

From: Brian E Carpenter <[email-masked]>
Date: Mon, 4 Apr 2022 14:21:29 +1200

Hi,

It turns out that CUPS is not the only printer software disturbed by this issue. In some scenarios, a Windows 10 printer supported by the Microsoft WSD virtual printer port can have an IPv6 Link Local URL. For example:
https://bugzilla.mozilla.org/show_bug.cgi?id=1759739
(The OP is slightly wrong in his suggestion, but the problem is very real.)

and I suspect the same issue is behind this advice from HP:
"4.  If the printer supports and has IPv6 enabled, disable IPv6 in the printer."
https://h30434.www3.hp.com/t5/Printer-Setup-Software-Drivers/HP-8610-Windows-10-and-the-WSD-port/td-p/6527462

Maybe Edge will be the first browser to implement RFC6874bis?

Regards
    Brian Carpenter

On 25-Mar-22 10:05, Michael Sweet wrote:
> Brian,
> 
>> On Mar 24, 2022, at 4:54 PM, Brian E Carpenter <[email-masked]> wrote:
>> ...
>> Sure. But if the initiating host uses %25eth0, that must be retained, and if it uses %eth0, that must be retained. It's no business of the server which format the client uses.
> 
> Actually, good HTTP implementations do validation of the Host: header in order to protect against well-known DNS rebinding attacks, so a server that validates an IPv6 address will need to be updated to validate all three formats...  Not onerous, but something that does require consideration.
> 
> ________________________
> Michael Sweet
> 
> 
>