Re: Is there any way to turn off IPv6 in the stock Debian 2.6.30 kernel without recompiling?
Hi, On Thu, Sep 10, 2009 at 9:00 PM, Rick Thomas wrote: > > On Sep 10, 2009, at 7:30 AM, Javier Barroso wrote: > >> Hi, >> >> On Wed, Sep 9, 2009 at 12:03 AM, Rick Thomas wrote: >>> >>> >>> The 2.6.30 kernel seems to have ipv6 turned on and compiled-in -- i.e. >>> not a >>> module. >>> >>> Does this make it impossible to turn off IPv6? Or am I missing >>> something... Ok, one time I heard about comment all ipv6 related lines in /etc/hosts. I'm not sure if this stop ipv6 stuff (I think not at all). In the other hand, I found a bug related with this issue [1]. It says about adding "ipv6.disable=1" into bootloader Regards, [1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=542470 -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
Re: Is there any way to turn off IPv6 in the stock Debian 2.6.30 kernel without recompiling?
On Sep 10, 2009, at 7:30 AM, Javier Barroso wrote: Hi, On Wed, Sep 9, 2009 at 12:03 AM, Rick Thomas wrote: The 2.6.30 kernel seems to have ipv6 turned on and compiled-in -- i.e. not a module. Does this make it impossible to turn off IPv6? Or am I missing something... At least in sid: head -3 /etc/modutils/aliases ; grep -i ipv6 aliases # Aliases to tell insmod/modprobe which modules to use # Uncomment the network protocols you don't want loaded: # alias net-pf-10 off # IPv6 If uncomment this is not working, please report as a bug. H, The system in question is running "Testing" (aka "Squeeze"). There's no such file as /etc/modutils/aliases on this system. However, in the /etc/modprobe.d/aliases.conf file, there is (I have abbreviated) the following set of comments: == # These are the standard aliases for devices and kernel drivers. # This file does not need to be modified. # # No new aliases should be added to this file, please file a bug against # the kernel for any aliases which are still not built-in. # network protocols ## # 7 BRIDGE # alias net-pf-10 ipv6 == The documentation for modprobe in Squeeze says that, to do the equivalent of what Javier suggests, I should put a file called something like "local.conf" in /etc/modprobe.d with the lines that Mark suggested: alias net-pf-10 off alias ipv6 off I tried that, but it didn't work -- because ipv6 is compiled-in to the current Squeeze stock kernel. What did work, as suggested by Kelly, was to put a file called "local.conf" in /etc/sysctl.d/ that contained the line: === net.ipv6.conf.eth0.disable_ipv6 = 1 === There is no such sysctl configuration option in the current stock Lenny kernel. Is this a bug or a feature? If it's a bug, what package should I file it against? Is linux- headers-2.6.30-1-amd64 appropriate? That's the current distributed stock kernel in Squeeze... Thanks! Rick -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
Re: Is there any way to turn off IPv6 in the stock Debian 2.6.30 kernel without recompiling?
Hi, On Wed, Sep 9, 2009 at 12:03 AM, Rick Thomas wrote: > > > The 2.6.30 kernel seems to have ipv6 turned on and compiled-in -- i.e. not a > module. > > Does this make it impossible to turn off IPv6? Or am I missing something... At least in sid: head -3 /etc/modutils/aliases ; grep -i ipv6 aliases # Aliases to tell insmod/modprobe which modules to use # Uncomment the network protocols you don't want loaded: # alias net-pf-10 off # IPv6 If uncomment this is not working, please report as a bug. Regards, -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
Re: Is there any way to turn off IPv6 in the stock Debian 2.6.30 kernel without recompiling?
On Wed, Sep 9, 2009 at 12:52, Rick Thomas wrote: > On Sep 8, 2009, at 10:02 PM, Mark wrote: > >> Rick Thomas wrote: >>> >>> The 2.6.30 kernel seems to have ipv6 turned on and compiled-in -- i.e. >>> not a module. >>> Does this make it impossible to turn off IPv6? Or am I missing >>> something... >> >> Had the same issue a while back already, but after a quick google search I >> found something that was similar to what I did then. >> >> alias net-pf-10 off >> alias ipv6 off >> >> Those two, and jam them in a /etc/modprobe.d/00ipv6disable or something >> along those lines. Don't forget to reboot. > > Interestingly, > > This didn't work on the Squeeze system, but it worked fine on a Lenny system > running a stock Lenny 2.6.26-2 kernel, which seems to have been generated > with ipv6 as a module. [reformated to bottom post, please don't top post] That is beacuse those two lines go in /etc/modprobe.d/ which deals with modules (module probe). So they have no effect when it is not a module. > Equally interestingly, > > The Lenny system had no file called /proc/sys/net/ipv6/conf/*/disable_ipv6 > > Is this new with 2.6.30 (Squeeze) kernels? Or is it a feature of having > ipv6 compiled in? That I don't know. Cheers, Kelly Clowers -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
Re: Is there any way to turn off IPv6 in the stock Debian 2.6.30 kernel without recompiling?
Interestingly, This didn't work on the Squeeze system, but it worked fine on a Lenny system running a stock Lenny 2.6.26-2 kernel, which seems to have been generated with ipv6 as a module. Equally interestingly, The Lenny system had no file called /proc/sys/net/ipv6/conf/*/ disable_ipv6 Is this new with 2.6.30 (Squeeze) kernels? Or is it a feature of having ipv6 compiled in? Very curious! Rick On Sep 8, 2009, at 10:02 PM, Mark wrote: Rick Thomas wrote: The 2.6.30 kernel seems to have ipv6 turned on and compiled-in -- i.e. not a module. Does this make it impossible to turn off IPv6? Or am I missing something... Had the same issue a while back already, but after a quick google search I found something that was similar to what I did then. alias net-pf-10 off alias ipv6 off Those two, and jam them in a /etc/modprobe.d/00ipv6disable or something along those lines. Don't forget to reboot. An other option is to build your own kernel, or fix the ipv6 setup (DNS issue maybe?) ,Mark -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
Re: Is there any way to turn off IPv6 in the stock Debian 2.6.30 kernel without recompiling?
On Sep 9, 2009, at 5:52 AM, Mark wrote: suggesting disabling the ipv6 module in /etc/modprobe.d/local.conf Rick Thomas wrote: Sadly, it was a good idea but it didn't work. Apparently, having the module compiled in prevents any of the modprobe stuff from having any effect on it. However, Kelly gave me a pointer that led me to the right fix. Yeah, I noticed. I don't think this is a debian stock kernel tho.. lsmod |grep ipv[4-6] (incase the ipv5 virus is spreading :P) Jokes aside.. I got a feeling this is a hand made kernel, the ipv6 bit has (to what I could find in the change logs) not been jammed in the kernel itself. X11 is annoyed with ya for having ipv6 support, but dropping the traffic at the kernel.. it does not understand what happend. X11 has "native"ipv6 support (so it seems). Give us a uname -a for the fun of it. ,Mark If X11 is upset by turning off ipv6 at the kernel, why does it work with "eth0" but not with "all" ??!! And why is there no "DISPLAY" variable in the shell environment? It's not a self-made kernel. I got it from the "testing" repo just a couple of weeks ago. lsmod | grep ipv gives nothing. Note that we have "CONFIG_IPV6=y" not "=m" in the config file... Curiouser and curiouser! Rick == rbtho...@frogpond:~$ uname -a Linux frogpond 2.6.30-1-amd64 #1 SMP Sat Aug 15 18:09:19 UTC 2009 x86_64 GNU/Linux rbtho...@frogpond:~$ grep -i ipv6 /boot/config-2.6.30-1-amd64 CONFIG_IPV6=y CONFIG_IPV6_PRIVACY=y CONFIG_IPV6_ROUTER_PREF=y CONFIG_IPV6_ROUTE_INFO=y CONFIG_IPV6_OPTIMISTIC_DAD=y CONFIG_IPV6_MIP6=y CONFIG_IPV6_SIT=m CONFIG_IPV6_NDISC_NODETYPE=y CONFIG_IPV6_TUNNEL=m CONFIG_IPV6_MULTIPLE_TABLES=y CONFIG_IPV6_SUBTREES=y CONFIG_IPV6_MROUTE=y CONFIG_IPV6_PIMSM_V2=y # CONFIG_IP_VS_IPV6 is not set # IPv6: Netfilter Configuration CONFIG_NF_CONNTRACK_IPV6=m CONFIG_IP6_NF_MATCH_IPV6HEADER=m rbtho...@frogpond:~$ aptitude -vv show linux-image-2.6.30-1-amd64 Package: linux-image-2.6.30-1-amd64 New: yes State: installed Automatically installed: yes Version: 2.6.30-6 Priority: optional Section: kernel Maintainer: Debian Kernel Team Uncompressed Size: 86.5M Architecture: amd64 Compressed Size: 24.9M Filename: pool/main/l/linux-2.6/linux-image-2.6.30-1- amd64_2.6.30-6_amd64.deb MD5sum: 3fa2c05b8d94af7668abdbbadd22996e Archive: testing Depends: module-init-tools, initramfs-tools (>= 0.55) | yaird (>= 0.0.13) | linux-initramfs-tool PreDepends: debconf | debconf-2.0 Suggests: linux-doc-2.6.30, grub | lilo Conflicts: initramfs-tools (< 0.55), yaird (< 0.0.13) Provides: linux-image, linux-image-2.6, linux-modules-2.6.30-1-amd64 Description: Linux 2.6.30 image on AMD64 This package provides the binary image and pre-built loadable modules for Linux kernel 2.6.30 on all 64bit single- and multiprocessor AMD and Intel machines. This kernel also runs on a Xen hypervisor. It supports only unpriviledged (domU) operation. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
Re: Is there any way to turn off IPv6 in the stock Debian 2.6.30 kernel without recompiling?
On Sep 9, 2009, at 12:04 AM, Kelly Clowers wrote: On Tue, Sep 8, 2009 at 15:03, Rick Thomas wrote: The 2.6.30 kernel seems to have ipv6 turned on and compiled-in -- i.e. not a module. Does this make it impossible to turn off IPv6? Or am I missing something... net.ipv6.conf.all.disable_ipv6=1 in /etc/sysctl.conf ought to do it. likewise "ipv6.disable=1" as a kernel option or "echo 1 >/proc/sys/net/ipv6/conf/all/disable_ipv6" on the CLI Not tested, however, and Ubuntu recently had a bug that stopped this from working Thanks, Kelly! A variation on that turned the trick. I had to do net.ipv6.conf.eth0.disable_ipv6=1 When I used "all" instead of "eth0" "ssh -X" didn't work properly when I ssh'ed to the host in question. It complained about not being able to open the display. And "env | grep DISPLAY" showed nothing. Bug or feature? How does turning off ipv6 change the behavior of sshd with regards to X11forwarding? And why!!?? Curiouser and curiouser, cried Alice! Rick PS: I don't know why I didn't see the "disable_ipv6" option before. I looked in /proc/sys/net/ipv6 for anything that might be useful, but somehow overlooked the obvious... Oh well! It's good to have others to talk to when you're like that. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
Re: Is there any way to turn off IPv6 in the stock Debian 2.6.30 kernel without recompiling?
On Tue, Sep 8, 2009 at 15:03, Rick Thomas wrote: > > > The 2.6.30 kernel seems to have ipv6 turned on and compiled-in -- i.e. not a > module. > > Does this make it impossible to turn off IPv6? Or am I missing something... net.ipv6.conf.all.disable_ipv6=1 in /etc/sysctl.conf ought to do it. likewise "ipv6.disable=1" as a kernel option or "echo 1 >/proc/sys/net/ipv6/conf/all/disable_ipv6" on the CLI Not tested, however, and Ubuntu recently had a bug that stopped this from working Cheers, Kelly Clowers -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
