Debian: How do I disable ipv6?

Mark Hobley <(E-Mail Removed)> wrote:
> How do I disable ipv6 in Debian?

> I have blacklisted the ipv6 module, but Debian has this compiled
> this into the monolithic core, rather than building it as a module.

> I have also added a file into the sysctl.d directory as follows:

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

> And I have rebooted the server, but ipv6 persists:

> Resolving ftp.uk.debian.org... 83.142.228.128, 2001:470:1f08:80b::2
> ^
> ipv6

That may be a function of whether the application making the
getaddrinfo() call is or is not setting the AI_ADDRCONFIG flag. If it
does, then addresses of a given family will only be returned if there
is an interface (other than loopback) configured with an address from
that family. If that flag is not set, even a "pure" IPv4 system may
return an IPv6 address via getaddrinfo(), having been given it by the
DNS server - even though/if the DNS query was carried in an IPv4
datagram.

> netstat -a
> tcp6 0 0 [::]:43801 [::]:* LISTEN
> tcp6 0 0 [::]:46874 [::]:* LISTEN
> tcp6 0 0 [::]:52607 [::]:* LISTEN
> tcp6 0 0 [::]:nfs [::]:* LISTEN
> tcp6 0 0 [::]:56389 [::]:* LISTEN
> tcp6 0 0 [::]:44584 [::]:* LISTEN
> tcp6 0 0 [::]:sunrpc [::]:* LISTEN
> tcp6 0 0 [::]:www [::]:* LISTEN

> ^ ^ ^
> More ipv6

Well, more addresses being displayed using IPv6 style at least, and
indicating that their owning applications may have been ported to be
able to accept connections via IPv6.

> I don't want any ipv6 on this leg of the network.

Are there any interfaces on the system configured with an IPv6
address? If not, then apart from the AI_ADDRCONFIG question,
everything else is really (IIRC) just cosmetic.

rick jones

> Mark.

> --
> Mark Hobley
> Linux User: #370818 http://markhobley.yi.org/


--
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How do I disable ipv6 in Debian?

I have blacklisted the ipv6 module, but Debian has this compiled this into
the monolithic core, rather than building it as a module.

I have also added a file into the sysctl.d directory as follows:

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

And I have rebooted the server, but ipv6 persists:

Resolving ftp.uk.debian.org... 83.142.228.128, 2001:470:1f08:80b::2
^
ipv6

netstat -a
tcp6 0 0 [::]:43801 [::]:* LISTEN
tcp6 0 0 [::]:46874 [::]:* LISTEN
tcp6 0 0 [::]:52607 [::]:* LISTEN
tcp6 0 0 [::]:nfs [::]:* LISTEN
tcp6 0 0 [::]:56389 [::]:* LISTEN
tcp6 0 0 [::]:44584 [::]:* LISTEN
tcp6 0 0 [::]:sunrpc [::]:* LISTEN
tcp6 0 0 [::]:www [::]:* LISTEN

^ ^ ^
More ipv6

I don't want any ipv6 on this leg of the network.

Mark.

--
Mark Hobley
Linux User: #370818 http://markhobley.yi.org/

Hello,

Mark Hobley a écrit :
> How do I disable ipv6 in Debian?
>
> I have blacklisted the ipv6 module, but Debian has this compiled this into
> the monolithic core, rather than building it as a module.

You can add ipv6.disable=1 to the kernel command line in the boot loader
setup.