disable IPv6 ?

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disable IPv6 ?

Postby mack_mcash » Sat Jul 20, 2013 1:48 pm

Hey, all. I'm using lmde_32bit-201204_xfce, with UP6, and stumbled upon the topic of: "disable_IPv6_for_wheezy", at these links:
Here is the steps from the above links:

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Step 1) Strictly follow one of the above links, to the letter. Dasien's post
*(on bottom)
is a summary of the Wiki page but, it includes code one could easily copy and paste into the terminal to accomplish the goals of said Wiki page.

Step 2) Edit /etc/netconfig on two lines. Find these lines:

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    udp6       tpi_clts      v     inet6    udp     -       -
    tcp6       tpi_cots_ord  v     inet6    tcp     -       -

Comment them with a '#' sign:

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    #udp6       tpi_clts      v     inet6    udp     -       -
    #tcp6       tpi_cots_ord  v     inet6    tcp     -       -

Gratuitous advice: Before editing sytem files, "always" make a backup copy by appending .backup to the end of a filename.

That should clean up any remaining IPv6 processes.

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However, since following directions seems to be something of a lost art, the commands below can be copied-and-pasted to achieve exactly the same effect.

Step 1: Open a terminal and su to root

Step 2: Verify that IPv6 is (or is not) active

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    netstat -tunlp |grep p6 |wc -l

If the result is anything other than 0, then one or more IPv6-aware processes is running.

Step 3: Follow Wiki directions (aka copy-and-paste these three lines into a root terminal).

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    echo net.ipv6.conf.all.disable_ipv6=1 > /etc/sysctl.d/disableipv6.conf

    sed '/::/s/^/#/' /etc/hosts >/etc/dipv6-tmp;cp -a /etc/hosts /etc/hosts-backup && mv /etc/dipv6-tmp /etc/hosts

    sed '/ipv6=yes/s/yes/no/' /etc/avahi/avahi-daemon.conf >/etc/avahi/dipv6-tmp;cp -a /etc/avahi/avahi-daemon.conf /etc/avahi/avahi-daemon.conf-backup && mv /etc/avahi/dipv6-tmp /etc/avahi/avahi-daemon.conf

Step 4: Reboot

Step 5: Repeat Steps 1-2

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    #netstat -tunlp |grep p6 |wc -l

should now return 0

Again, these steps will disable IPv6 on a stock install of Squeeze. If you have additional IPv6-aware processes running (server daemons in particular), then additional steps may be required, as outlined in the two articles linked to below.

Additional resources, references:

I'm ignorant on this subject and am seeking info from someone that may be willing to give advice as to whether following the steps outlined to disable IPv6 is desirable.

What are the benefits of disabling IPv6? Is it safe?
If a person did in fact follow these steps and disable IPv6, will there be consequences in the future when IPv6 is the standard?

Thanks for your response, if any. :)

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Re: disable IPv6 ?

Postby nomko » Sat Jul 20, 2013 4:05 pm

I'm not sure about your location/country, but here in Holland most providers are switching to IPv6 since IP addresses for IPv4 are running out (if they already aren't). I don't know which ISP you have, but looking at this development, i think it's not really smart to disable IPv6.

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Re: disable IPv6 ?

Postby DrHu » Sat Jul 20, 2013 4:24 pm

Most of the time IPV6 addresing doesn't in any way affect your computer operssations, whether enabled or not: some browser situations might benefit from disabling IPV6, other than that no problem having it in use (enabled..)

You don't really need IP6 if you are behind a nat, as most users might find the IPV4 xxx.xxx.xxx.xxx addressing scheme sufficient and possibly easier to understand

As in
172__ (forgot the #s at the moment, since I don't usually use that schema)
--its a standard, from IANA
https://en.wikipedia.org/wiki/Network_a ... ranslation
--might help get the picture

When you do that, you have to use port forwarding in order to get into the internet
http://superuser.com/questions/284051/w ... t-used-for

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Re: disable IPv6 ?

Postby mack_mcash » Sun Jul 21, 2013 7:10 am

Thanks, guys for the responses.

I am NOT going to disable IPv6 on my machine now since I believe it is not necessary. :)

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