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Bug 142148 - kern.log flooded with "neighbour table overflow "
Summary: kern.log flooded with "neighbour table overflow "
Status: RESOLVED TEST-REQUEST
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: [OLD] Core system (show other bugs)
Hardware: x86 Linux
: High normal
Assignee: Gentoo Kernel Bug Wranglers and Kernel Maintainers
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2006-07-29 21:50 UTC by Kim Nilsson
Modified: 2006-08-07 16:38 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


Attachments
Logs of various commands for checking network settings (nto,28.11 KB, text/plain)
2006-07-29 21:56 UTC, Kim Nilsson
Details

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Description Kim Nilsson 2006-07-29 21:50:59 UTC
Portage 2.1.1_pre4 (default-linux/x86/2006.0, gcc-4.1.1, glibc-2.3.6-r4, 2.6.16-gentoo-r10 i686)
=================================================================
System uname: 2.6.16-gentoo-r10 i686 Intel(R) Pentium(R) 4 CPU 2.40GHz
Gentoo Base System version 1.12.1
app-admin/eselect-compiler: [Not Present]
dev-lang/python:     2.3.5, 2.4.3-r1
dev-python/pycrypto: 2.0.1-r5
dev-util/ccache:     [Not Present]
dev-util/confcache:  [Not Present]
sys-apps/sandbox:    1.2.17
sys-devel/autoconf:  2.13, 2.59-r7
sys-devel/automake:  1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2
sys-devel/binutils:  2.16.1-r3
sys-devel/gcc-config: 1.3.13-r3
sys-devel/libtool:   1.5.22
virtual/os-headers:  2.6.11-r5
ACCEPT_KEYWORDS="x86"
AUTOCLEAN="yes"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-mtune=pentium4 -march=pentium4 -Os -pipe -fomit-frame-pointer"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/3.4/env /usr/kde/3.4/share/config /usr/kde/3.4/shutdown /usr/kde/3.5/env /usr/kde/3.5/share/config /usr/kde/3.5/shutdown /usr/share/X11/xkb /usr/share/config"
CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/gconf /etc/java-config/vms/ /etc/splash /etc/terminfo"
CXXFLAGS="-mtune=pentium4 -march=pentium4 -Os -pipe -fomit-frame-pointer"
DISTDIR="/usr/portage/distfiles"
EMERGE_DEFAULT_OPTS="--alphabetical"
FEATURES="autoconfig distlocks metadata-transfer parallel-fetch sandbox sfperms strict"
GENTOO_MIRRORS="ftp://ftp.du.se/pub/os/gentoo http://ds.thn.htu.se/linux/gentoo http://mirror.gentoo.no/ http://gentoo.osuosl.org/ ftp://distro.ibiblio.org/pub/linux/distributions/gentoo/ ftp://ftp.gtlib.gatech.edu/pub/gentoo ftp://ftp.ussg.iu.edu/pub/linux/gentoo ftp://ftp.ucsb.edu/pub/mirrors/linux/gentoo/ ftp://gentoo.mirrors.pair.com/ ftp://gentoo.mirrors.tds.net/gentoo ftp://gentoo.netnitco.net/pub/mirrors/gentoo/source/ ftp://mirror.datapipe.net/gentoo http://mirror.uni-c.dk/pub/gentoo/ http://trumpetti.atm.tut.fi/gentoo/ http://ftp.club-internet.fr/pub/mirrors/gentoo ftp://ftp.uni-erlangen.de/pub/mirrors/gentoo ftp://pandemonium.tiscali.de/pub/gentoo/ ftp://files.gentoo.org ftp://ftp.snt.utwente.nl/pub/os/linux/gentoo ftp://mirrors.blueyonder.co.uk/mirrors/gentoo ftp://ftp.mirrorservice.org/sites/www.ibiblio.org/gentoo/ ftp://ftp.planetmirror.com/pub/gentoo/ ftp://mirror.pacific.net.au/linux/Gentoo ftp://mirror.isp.net.au/pub/gentoo/ "
LANG="sv_SE.UTF-8"
LC_ALL="sv_SE.UTF-8"
LDFLAGS="-Wl,-O1 -Wl,--sort-common -s"
LINGUAS="sv_SE sv en en_GB en_US da"
MAKEOPTS="-j2"
PKGDIR="/usr/portage/packages"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --delete-after --stats --timeout=180 --exclude='/distfiles' --exclude='/local' --exclude='/packages'"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/gentoo-webapps-overlay/experimental /usr/local/gentoo-webapps-overlay/production-ready /usr/local/gentoo-general-overlay"
SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage"
USE="x86 7zip X a52 acpi alsa apache2 apm avi bcmath berkdb bitmap-fonts bzlib cdr cli crypt cups dlloader dri dvd dvdr eds emboss encode fam ffmpeg flac foomaticdb fortran ftp gdbm gif gnome gnutls gpm gstreamer gtk gtk2 imlib ipv6 isdnlog jpeg jpeg2k kde libg++ libwww lzo mad mikmod mmx motif mp3 mpeg ncurses network nls nptl nptlonly nsplugin opengl oss pam pcre pdflib perl png pppd python qt qt3 qt4 quicktime readline reflection samba sdl session spell spl sse sse2 ssl tcpd theora truetype truetype-fonts type1-fonts udev unicode xinerama xml xml2 xmms xorg xv zlib elibc_glibc input_devices_keyboard input_devices_mouse input_devices_evdev kernel_linux linguas_sv_SE linguas_sv linguas_en linguas_en_GB linguas_en_US linguas_da userland_GNU video_cards_nvidia"
Unset:  CTARGET, INSTALL_MASK, PORTAGE_RSYNC_EXTRA_OPTS
Comment 1 Kim Nilsson 2006-07-29 21:56:16 UTC
Created attachment 93043 [details]
Logs of various commands for checking network settings

Same info is found here, in a more readable format:
http://forums.gentoo.org/viewtopic-t-20204-highlight-neighbour+table+overflow.html
Comment 2 Jakub Moc (RETIRED) gentoo-dev 2006-07-30 10:13:45 UTC
I really fail to see the security impact here, re-assigning. You might want to set 

/proc/sys/net/ipv4/neigh/default/gc_thresh1
/proc/sys/net/ipv4/neigh/default/gc_thresh2
/proc/sys/net/ipv4/neigh/default/gc_thresh3

to some higher value in /etc/sysctl.conf
Comment 3 Tim Yamin (RETIRED) gentoo-dev 2006-08-07 16:38:39 UTC
(In reply to comment #2)
> I really fail to see the security impact here, re-assigning. You might want to
> set 
> 
> /proc/sys/net/ipv4/neigh/default/gc_thresh1
> /proc/sys/net/ipv4/neigh/default/gc_thresh2
> /proc/sys/net/ipv4/neigh/default/gc_thresh3
> 
> to some higher value in /etc/sysctl.conf

Give those a go, if that doesn't fix the problem please supply further information (what sysctl values you used, for example and when the problem occurs) and reopen the bug. Thanks.