Date: Mon, 28 Jan 2008 11:09:52 +0200 From: Volodymyr Kostyrko <c.kworr@gmail.com> To: freebsd-current@freebsd.org Subject: Re: resolver change? Message-ID: <fnk650$4qj$2@ger.gmane.org> In-Reply-To: <86d4rn1kln.fsf@ds4.des.no> References: <86d4rn1kln.fsf@ds4.des.no>
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Dag-Erling Smørgrav пишет:
> Did something change in our resolver / getaddrinfo() recently? Check
> this out:
>
> des@soe ~% cat /etc/ntp.conf
> server europe.pool.ntp.org iburst
> server europe.pool.ntp.org iburst
> server europe.pool.ntp.org iburst
> server europe.pool.ntp.org iburst
> server europe.pool.ntp.org iburst
> server europe.pool.ntp.org iburst
> des@soe ~% ntpq -pn
> remote refid st t when poll reach delay offset jitter
> ==============================================================================
> 81.169.180.26 .INIT. 16 u - 512 0 0.000 0.000 4000..00
> 81.169.180.26 .INIT. 16 u - 512 0 0.000 0.000 4000..00
> 81.169.180.26 .INIT. 16 u - 512 0 0.000 0.000 4000..00
> 81.169.180.26 .INIT. 16 u - 512 0 0.000 0.000 4000..00
> 81.169.180.26 .INIT. 16 u - 512 0 0.000 0.000 4000..00
> *81.169.180.26 192.53.103.104 2 u 2 64 77 63.218 -19.045 3.331
>
> europe.pool.ntp.org returns a different address every time you query it,
> and this used to work correctly. I don't know when it changed; it
> worked fine before I last rebooted my NTP server five days ago, but its
> userland is from December 16.
>
> It is *not* a name server issue:
>
> des@soe ~% host europe.pool.ntp.org
> europe.pool.ntp.org has address 81.169.180.26
> europe.pool.ntp.org has address 77.66.32.156
> europe.pool.ntp.org has address 217.8.241.75
> europe.pool.ntp.org has address 130.226.232.145
> europe.pool.ntp.org has address 87.32.0.19
> des@soe ~% host europe.pool.ntp.org
> europe.pool.ntp.org has address 87.32.0.19
> europe.pool.ntp.org has address 81.169.180.26
> europe.pool.ntp.org has address 77.66.32.156
> europe.pool.ntp.org has address 217.8.241.75
> europe.pool.ntp.org has address 130.226.232.145
>
> Somehow, ntpd (or libc) is caching the result of the lookup where it
> previously didn't.
>
> But this doesn't make sense, since neither ntpd nor libc nor
> /etc/{nsswitch,ntp,resolv}.conf have changed since it last worked.
>
> For now, I'm going to work around it by explicitly using
> [1-3].europe.pool.ntp.org, but I'd really like to know what's going
> on...
>
> DES
Well, tried that and found that if you rapidly issue a host command the
results still the same (for 1 or 2 secs).
> host 3.europe.pool.ntp.org
3.europe.pool.ntp.org has address 212.13.207.101
3.europe.pool.ntp.org has address 87.229.78.162
3.europe.pool.ntp.org has address 193.228.143.13
3.europe.pool.ntp.org has address 192.108.114.23
3.europe.pool.ntp.org has address 194.238.48.3
> host 3.europe.pool.ntp.org
3.europe.pool.ntp.org has address 212.13.207.101
3.europe.pool.ntp.org has address 87.229.78.162
3.europe.pool.ntp.org has address 193.228.143.13
3.europe.pool.ntp.org has address 192.108.114.23
3.europe.pool.ntp.org has address 194.238.48.3
> host 3.europe.pool.ntp.org
3.europe.pool.ntp.org has address 87.229.78.162
3.europe.pool.ntp.org has address 193.228.143.13
3.europe.pool.ntp.org has address 192.108.114.23
3.europe.pool.ntp.org has address 194.238.48.3
3.europe.pool.ntp.org has address 212.13.207.101
Try using this config:
server 0.europe.pool.ntp.org iburst
server 1.europe.pool.ntp.org iburst
server 2.europe.pool.ntp.org iburst
server 3.europe.pool.ntp.org iburst
--
Sphinx of black quartz judge my vow.
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