Bug #267

DNS doesn't appear to work on some interfaces

Added by Dave Täht on Sep 10, 2011. Updated on Sep 17, 2011.
Closed Urgent Dave Täht

Description

The report:

This is on an 802.11g (sw00) channel, since there seems to be an issue with DNS on the .11a (sw10) channel. Interestingly enough, when I associate with the .11a guest (sw11) channel, the DNS works. (Go figure; would you like me to file a bug report on that?)

I’ve seen this too. bind9 is supposed to scan the available interfaces every two minutes, and it seems possible to trigger a new scan when a new interface comes up OR have some linux specific monitoring thing (inotify, kernel event?)

Certainly all the wireless interfaces are not active when named starts…

I also note that this report is AFTER we upgraded to bind 9.8.1….

History

Updated by Frank Horowitz on Sep 13, 2011.
OK, A closer look reveals that the interface sw10 does not have an IP address, even though gw10 (and all the others) do.

Possibly related are the following “bad number” error messages from logread:

Sep 14 08:59:53 Lirpo5 daemon.warn radvd[4403]: resetting ipv6-allrouters membership on sw00
Sep 14 08:59:54 Lirpo5 daemon.notice ntpd[4468]: ntpd 4.2.6p3@1.2290-o Fri Sep 9 22:12:28 UTC 2011 (1)
Sep 14 08:59:54 Lirpo5 daemon.notice ntpd[4469]: proto: precision = 6.288 usec
Sep 14 08:59:54 Lirpo5 daemon.debug ntpd[4469]: ntp_io: estimated max descriptors: 1024, initial socket boundary: 16
Sep 14 08:59:54 Lirpo5 daemon.err ntpd[4469]: unable to bind to wildcard address 0.0.0.0 - another process may be running - EXITING
Sep 14 08:59:54 Lirpo5 user.info sysinit: sh: bad number
Sep 14 08:59:54 Lirpo5 user.info sysinit: sh: bad number
Sep 14 08:59:54 Lirpo5 user.info sysinit: sh: bad number
Sep 14 08:59:54 Lirpo5 user.info sysinit: sh: bad number
Sep 14 08:59:54 Lirpo5 user.info sysinit: setting up led WAN LED (green)
Sep 14 08:59:54 Lirpo5 kern.debug kernel: ar71xx-wdt: enabling watchdog timer
Sep 14 08:59:54 Lirpo5 user.info sysinit: Polipo is starting…

Updated by Frank Horowitz on Sep 13, 2011.
Found it. The config stanza for sw10 in /etc/config/network had some funky bridging and ifname lines. Commenting them out brings back the IP number assignment, (and presumably DNS et al.)…
Updated by Dave Täht on Sep 15, 2011.
thx! I’ll fix this in rc6-smoketest8
Updated by Dave Täht on Sep 15, 2011.
or rather, I would, if that was a file showing problems in it. But it doesn’t. So maybe something about the autogeneration of wifi interfaces messes with this. I will test before releasing smoketest8….
Updated by Dave Täht on Sep 15, 2011.
the syntax of the /etc/config/network file had grown much pickier about quoting than previous. The quotes are now liberally throughout and appear to work. Smoketest9 will contain the fixes.

Thank you for the spot! as this disabled dhcp entirely on the main wireless interfaces it was very bad…

Updated by Frank Horowitz on Sep 16, 2011.
No worries! “All bugs are shallow, etc. etc. etc.” ;-)

Just confirming that rc6 has fixed the issue for me.

Updated by Dave Täht on Sep 17, 2011.
so I (or you) can close this bug?
Updated by Frank Horowitz on Sep 17, 2011.

This is a static export of the original bufferbloat.net issue database. As such, no further commenting is possible; the information is solely here for archival purposes.

Cerowrt Project

News items
List of Wiki pages
List of bugs
RSS feed

Recent Updates

Jul 21, 2024 Wiki page
cake-autorate
Jul 21, 2024 Wiki page
What Can I Do About Bufferbloat?
Jul 21, 2024 Wiki page
Tests for Bufferbloat
Jul 1, 2024 Wiki page
RRUL Chart Explanation
Dec 3, 2022 Wiki page
Codel Wiki

Find us elsewhere

Bufferbloat Mailing Lists
#bufferbloat on Twitter
Google+ group
Archived Bufferbloat pages from the Wayback Machine

Sponsors

Comcast Research Innovation Fund
Nlnet Foundation
Shuttleworth Foundation
GoFundMe

Bufferbloat Related Projects

OpenWrt Project
Congestion Control Blog
Flent Network Test Suite
Sqm-Scripts
The Cake shaper
AQMs in BSD
IETF AQM WG
CeroWrt (where it all started)

Network Performance Related Resources


Jim Gettys' Blog - The chairman of the Fjord
Toke's Blog - Karlstad University's work on bloat
Voip Users Conference - Weekly Videoconference mostly about voip
Candelatech - A wifi testing company that "gets it".