RE: Disable ipv6.......

[Bonno Bloksma <b.bloksma@tio.nl>]

Hello Charlie,

>> # rmmod ipv6
>> 
>> libkmod: ERROR ../libkmod/libkmod-module.c:1802
>> kmod_module_get_holders: could not open '/sys/module/ipv6/holders': No 
>> such file or directory Error: Module ipv6 is in use
>
> Thank you Ivan and Pi for your help.
>
> I think the message above is spurious, a remnant of something that has not yet been updated from Wheezy.
>
> [...]
>
> So I am certain now that I don't have ipv6 enabled at all, and that message can be ignored.

In previous Debian versions ipv6 was done via a module that one could unload or disable to prevent ipv6 being activated.
As of Squeeze ipv6 is built in at the kernel level and cannot be disabled that way.

So unless you are still running Lenny or build your own kernel there is no ipv6 module.
Just do "ip addr" or "ifconfig" and you will probably see ip6 lines, ip6 is default on now. If your uplink does not do ipv6 then there is no ipv6 traffic going over the line and no delay in using ipv4.

Bonno Bloksma