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[Ntp] Antw: [EXT] Re: [Tsv‑art] Tsvart early review of draft‑ietf‑ntp‑alternative‑port‑02

Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de> Mon, 06 December 2021 07:59 UTC

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Date: Mon, 06 Dec 2021 08:59:34 +0100
From: Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>
To: halmurray@sonic.net, touch@strayalpha.com
Cc: magnus.westerlund@ericsson.com, iana-port-experts@icann.org, draft-ietf-ntp-alternative-port.all@ietf.org, "ntp@ietf.org" <ntp@ietf.org>, tsv-art@ietf.org, tsvwg@ietf.org
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Subject: [Ntp] Antw: [EXT] Re: [Tsv‑art] Tsvart early review of draft‑ietf‑ntp‑alternative‑port‑02
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>>> Hal Murray <halmurray@sonic.net> schrieb am 05.12.2021 um 00:12 in Nachricht
<20211204231206.A534228C17A@107-137-68-211.lightspeed.sntcca.sbcglobal.net>:

...
> Many many many sites have quietly installed filters in their routers.  Set 
> and 
> forget.
...

Can any RFC do something against that "set and forget" mentality? I guess not.


> 
> A typical filter drops UDP traffic to port 123 with a length other than 48.  
> 
> That lets old unauthenticated NTP through but authenticated packets are 
> longer 
> and get dropped.

Still no RFC can fix this. Anybody having read the NTPv3/NTPv4 RFCs should know better.

...

Regards,
Ulrich

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