Your message dated Tue, 22 Mar 2022 09:20:28 +0000
with message-id <[email protected]>
and subject line Bug#1006375: fixed in debian-edu-config 2.12.18
has caused the Debian Bug report #1006375,
regarding debian-edu-config: squid very slow due to IPv6-lookups being done
first, and only then IPv4
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
1006375: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1006375
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: debian-edu-config
Severity: important
Version: 2.12.17
Control: found -1 2.11.56+debu3
Debian Edu is not yet really IPv6-ready. That is another topic and
should be discussed elsewhere. Maybe for some people, Debian Edu works
perfectly on IPv6 and I don't know that yet, please let us know your
experiences on the Debian Edu mailing list. Thanks. (Don't Cc: such
discussion replies to the bug report's mail address, please).
However, here current Debian Edu work best if IPv4 connections (and
DNS lookups) are preferred over IPv6 connections and lookups.
In Squid, I made the observation today that squid tries to do an IPv6
lookup for a URL first and if that fails, it retries via IPv4. This
seems to work ok for Debian Edu networks where TJENER does not have a
public IPv6 address. However, in my customer's setup [1], loading a
complex website page via squid takes ages with this. Esp. if the squid
proxy is under medium to heavy load by other users on the network.
So, long story cut short, squid tries to route http(s) requests
(hostname/path queries, basically) over IPv6 first and falls back as
second choice to IPv4. This takes a bit of extra time for each URL to
be loaded. IMHO, this should be avoided, IPv4 should be preferred in
squid. Not only on this one customer setup, but in general it seems
(as the whole Debian Edu design currently is 'IPv4-first' or rather
'IPv4-only'.
So, I'd like to add (and this extra config line fixed the issue on the
customer site)
dns_v4_first on
to /etc/squid/conf.d/debian-edu.conf
Objections? Other opinions???
Mike
[1] In this customer setup TJENER has two network interfaces (a
.intern network and a .backbone network). The .backbone network is for
WiFi APs being able to access FreeRadius on TJENER (the WiFi APs are
not on the .intern network but on a separate management network). And
TJENER here as a public IPv6 address on the .backbone network's NIC
(eth1 here).
--
DAS-NETZWERKTEAM
c\o Technik- und Ökologiezentrum Eckernförde
Mike Gabriel, Marienthaler Str. 17, 24340 Eckernförde
mobile: +49 (1520) 1976 148
landline: +49 (4351) 850 8940
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pgpgMoALiqg9n.pgp
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--- Begin Message ---
Source: debian-edu-config
Source-Version: 2.12.18
Done: Mike Gabriel <[email protected]>
We believe that the bug you reported is fixed in the latest version of
debian-edu-config, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Mike Gabriel <[email protected]> (supplier of updated debian-edu-config
package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Format: 1.8
Date: Tue, 22 Mar 2022 09:53:57 +0100
Source: debian-edu-config
Architecture: source
Version: 2.12.18
Distribution: unstable
Urgency: medium
Maintainer: Debian Edu Developers <[email protected]>
Changed-By: Mike Gabriel <[email protected]>
Closes: 1002019 1005841 1006362 1006375 1006604 1008067
Changes:
debian-edu-config (2.12.18) unstable; urgency=medium
.
* etc/cups/cups-browsed-debian-edu.conf:
- Let TJENER's print queues appear on Debian Edu clients, use same
print queue names on clients as on TJENER. (Closes: #1005841).
* sbin/debian-edu-pxeinstall:
- Don't append 'ipappend 2' to the kernel boot cmdline anymore as it
confuses systemd when booting into the installed system. This resolves
the graphical.target not coming up on Debian Edu workstations that got
installed via the PXE/network based Debian Installer method. (Closes:
#1006362).
- Silence stderr output if the artwork theme lacks a plymouth subfolder.
This can be silently ignored and should not trouble Debian Edu admins.
* sbin/update-hostname-from-ip:
- Simply if-then-else-clauses, reduce number of exit calls, don't exit with
non-zero exitcode. Improve syslog messages if things fail. (Closes:
#1006604).
* share/debian-edu-config/squid.conf:
- Prefer DNSv4 lookups over DNSv6. Debian Edu does not yet fully support
IPv6 and many schools still use IPv4 primarily. This gives a great
performance boost to squid installations if IPv6 internet is not fully
available for whatever reason. (Closes: #1006375).
* share/debian-edu-config/tools/{update-proxy-from-wpad,wpad-extra}:
- Don't fail if proxy update is not possible, only send warnings to stderr
and syslog. Don't source wpad-extra script, execute it instead and
capture
stdout. (Closes: #1008067).
- White-space clean-up (use only tabs for indentation).
* Move /etc/debian-edu/host-keytabs/* to /var/lib/debian-edu/host-keytabs/
and replace directory /etc/debian-edu/host-keytabs by a symlink. (Closes:
#1002019).
* lintian: Update some override phrases (adjustments to the most recent
lintian version).
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