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------------------- Original Message -------------------
From: Dave Hart <h...@ntp.org>;
Received: Sun May 21 2023 23:50:10 GMT-0400 (Eastern Daylight Time)
To: questions@lists.ntp.org;
Subject: [questions] Fwd: Windows port pool IPv6 misbehavior

I recently visited a relative who, unlike myself, has IPv6 service from her 
ISP.  I noticed ntpd on my Windows laptop configured with:

pool 
2.pool.ntp.org<https://urldefense.proofpoint.com/v2/url?u=http-3A__2.pool.ntp.org&d=DwMFaQ&c=59WElTcIEwbBjXQe6gMr9RyqhrzJYRWAhv5h0b8rPQw&r=SFS-Xi521pAy4mTX_qIfD3V2MhNyuNL40eu8gHG8Lq8&m=xZGKngDdRx9Sg72e86ZEs0fIhjiboUVJ1Jp22FloMFGparyUWVyu-2BsT_xE_Lju&s=PeBMSOWyEk9p9miInS_QllfknNA8tvwDlpxbGYGIWwM&e=>

was not soliciting any IPv6 pool servers.  For those unfamiliar, the 
2.*.pool.ntp.org<https://urldefense.proofpoint.com/v2/url?u=http-3A__pool.ntp.org&d=DwMFaQ&c=59WElTcIEwbBjXQe6gMr9RyqhrzJYRWAhv5h0b8rPQw&r=SFS-Xi521pAy4mTX_qIfD3V2MhNyuNL40eu8gHG8Lq8&m=xZGKngDdRx9Sg72e86ZEs0fIhjiboUVJ1Jp22FloMFGparyUWVyu-2BsT_xE_Lju&s=u-T1XHTiDndS1l4rprS4CaG1dXPPBHJ4bzEHbR_gJwE&e=>
 names are the only ones which return IPv6 addresses
as well as IPv4.

This appears to be a bug in Windows 11 resolving hostnames to IP addresses.

I would love to hear from others if they are seeing similar behavior on Windows 
ntpd with a similar pool configuration.  I'm using Windows
11 22H2 (22621.702) x64.  I'm particularly curious to hear from those using 
other Windows versions so I can note in my bug report which
versions have broken getaddrinfo().

Incidentally there is a workaround available.  You can use something like the 
following:

pool 
pool.ntp.org<https://urldefense.proofpoint.com/v2/url?u=http-3A__pool.ntp.org&d=DwMFaQ&c=59WElTcIEwbBjXQe6gMr9RyqhrzJYRWAhv5h0b8rPQw&r=SFS-Xi521pAy4mTX_qIfD3V2MhNyuNL40eu8gHG8Lq8&m=xZGKngDdRx9Sg72e86ZEs0fIhjiboUVJ1Jp22FloMFGparyUWVyu-2BsT_xE_Lju&s=u-T1XHTiDndS1l4rprS4CaG1dXPPBHJ4bzEHbR_gJwE&e=>
pool -6 
2.pool.ntp.org<https://urldefense.proofpoint.com/v2/url?u=http-3A__2.pool.ntp.org&d=DwMFaQ&c=59WElTcIEwbBjXQe6gMr9RyqhrzJYRWAhv5h0b8rPQw&r=SFS-Xi521pAy4mTX_qIfD3V2MhNyuNL40eu8gHG8Lq8&m=xZGKngDdRx9Sg72e86ZEs0fIhjiboUVJ1Jp22FloMFGparyUWVyu-2BsT_xE_Lju&s=PeBMSOWyEk9p9miInS_QllfknNA8tvwDlpxbGYGIWwM&e=>

The first pool prototype association will pick up IPv4 addresses, while the 
second one will get IPv6 addresses.

Thanks for your time and assistance.

Cheers,
Dave Hart

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