13 replies to this topic

[ette9000]

Hi,

is there any way to fully disabling ipv6?

[Erik Slagter]

Remove the ipv6 module...

But first of all, why do you want to do that?

[ette9000]

Can I really remove this packages ?
kernel-module-ipv6 - 3.3.0-r8.7
task-base-ipv6 - 1.0-r95.11


I want to do that cause of the bad performance of my WLAN since the upgrade to linux 3.3.0 and I don't need ipv6 at my Home Network.

May be you have another hint for me?

[pieterg]

yes, you can remove them.
But the question is, is the bad performance really caused by ipv6.
Let us know when you tried.

[Erik Slagter]

Yes, I am very curious as well, I can't really believe it would matter.

[kocus37]

Can I really remove this packages ?
kernel-module-ipv6 - 3.3.0-r8.7
task-base-ipv6 - 1.0-r95.11

Where can i remove this package and how, thanks.

I read about it and only new devices routers modens and computers from this year of manufacturing, are using ipv6.
So to avoid possible problems its better stay ipv4, i am not and expert,but maybe is too soon.

Thanks

[adri]

yes, you can remove them.
But the question is, is the bad performance really caused by ipv6.
Let us know when you tried.

Pieter,

I'm thinking of removing them from my DM8000.
I have an ipv6 enabled network and router.
The DM8000 picks up an good ipv6 address through 'router advertisement'.
However it doesn't use the dns server and default gateway settings included in the 'router advertisement' message and configuration.
The information is properly included, since my Windows 7 PC gets and uses all the right settings.
Without a default ipv6 gateway, the dreambox is unable to communicate with the outside world.
Even local communication is troublesome, with packet drops or timeouts.
I tried manually setting a ipv6 route, using the 'route -A inet6 add default' command, but this does not work either.
An error is generated for an ioctl about 'unable to open device'.
Do you have any ideas on getting the ipv6 functionality improved and properly working for internal and external communications?

Thanks,

Adri.

[pieterg]

My guess is that you're hitting incomplete ipv6 implementations in busybox.
Busybox is used for most of the network related commands (udhcpc, ipconfig, route).

Perhaps you have more luck with busybox 1.19.4 which we'll use in our upcoming openpli-3.0

[MiLo]

Most of the IPv6 stack should be able to run without support from "user" programs, so it should work out-of-the-box without any help from busybox (unless you need DHCP6 support, which you shouldn't need). If it all went well, your box should have a link-local address (0xfe80 range if i recall correctly) and a router-assigned address (probably 0x2001 range). Did that work?

Unfortunately, there have been a few preliminary IPv6 implementations, and they don't match with what was eventually built. I suspect things will improve when the dm8000 uses a newer kernel.
There are a bunch of /proc/ (or /sys/) files related to ipv6, including options for router anouncements. It's been a while since I messed with those. There's also an option there to turn IPv6 off.

Or simply remove "kernel-module-ipv6" from the system to disable it.

(personally, I don't recommend IPv6 at all, it only reduces the network performance by increasing the overhead. Not a problem on gigabit, but on 100Mbps the 4% extra overhead is noticable.)

[adri]

Most of the IPv6 stack should be able to run without support from "user" programs, so it should work out-of-the-box without any help from busybox (unless you need DHCP6 support, which you shouldn't need). If it all went well, your box should have a link-local address (0xfe80 range if i recall correctly) and a router-assigned address (probably 0x2001 range). Did that work?

Unfortunately, there have been a few preliminary IPv6 implementations, and they don't match with what was eventually built. I suspect things will improve when the dm8000 uses a newer kernel.
There are a bunch of /proc/ (or /sys/) files related to ipv6, including options for router anouncements. It's been a while since I messed with those. There's also an option there to turn IPv6 off.

Or simply remove "kernel-module-ipv6" from the system to disable it.

(personally, I don't recommend IPv6 at all, it only reduces the network performance by increasing the overhead. Not a problem on gigabit, but on 100Mbps the 4% extra overhead is noticable.)

Milo,
I do get a link-local address in the fe80: and a router-assigned address in the :200x range.
This is as expected.
However I do not get a default gateway address, usually the link-local address of the router who did the 'advertisement'.
I am not using DHCP6.
The busybox implementation of the 'route' program has an option '-A inet[6]', to specify the address family for the route.
This does not work on Pli 2.1, since a required device seems to be missing.
I will remove the 'kernel-module-ipv6', since I don't need ipv6 on the dreambox and currently is disrupting communications when enabled without a default gateway.
On the rest of my network, I only use IPV6 for IPV6 only hosts on the internet.

Adri.

[DDX]

I do get a default gw on my dm8000 (from a fritzbox 7340)
And I can connect to an ipv6 server (shell.xs4all.nl) :

~# telnet 2001:888:0:1::888 22
SSH-2.0-OpenSSH_5.5p1 Debian-6+squeeze1

[ette9000]

I just disabled all IPV6 AND I changed the Wifi channel of my router.
I figured out that some of my neighbours have new WLAN routers which used the same Wifi channel.
So I decided to change it.

Now I got the OLD performance.

But at the end I don't think the good performance is caused by disabling IPV6!

[Erik Slagter]

But at the end I don't think the good performance is caused by disabling IPV6!

Indeed...

Bad wireless performance is most likely to be caused by interference from other sources (like access points from neighbours, but also other sources) and also degradation of the signal by the environment, like walls, reflections, etc. Sometimes it can help to move the access point or client bij just a few centimeters.

[Sjaaky]

A week ago I discovered that most of my neighbours use some sort of auto-sensing. I can choose the channel I want and most of them back off to another channel . So I'm comfortably at channel 13 while the other 7 ap's are somewhere between 1 and 7 .