Differences between revisions 2 and 9 (spanning 7 versions)

IPv6 configuration on Ubuntu (dapper) systems

How can I enable/disable IPv6 globally?

Ubuntu dapper default supports IPv6, so you have to do nothing to enable IPv6. If you want do disable IPv6 globally, please read [:IPv6hostslinux disableIPv6:our section] on how to do it.

How can I enable forwarding between IPv6 enabled interfaces?

In /etc/sysctl.conf add the line

net/ipv6/conf/all/forwarding=1

and run

# sysctl -p /etc/sysctl.conf

Please note, you cannot enable/disable IPv6 forwarding per interface as in the IPv4 case. If you want to disable IPv6 forwarding for some interfaces, use netfilter/p6tables.

How can I enable/disable autoconfiguration on all interfaces?

Autoconfiguration is enabled by default. If you want to disable it for all interfaces, add the line

net/ipv6/conf/all/autoconf=0

to /etc/sysctl.conf and reload the file by sysctl as it is shown above.

How can I enable/disable router behaviour (i.e not to accept router advertisements) on all devices?

The kernel default accepts router advertisements. You can disable it on all interfaces by adding the line

net/ipv6/conf/all/accept_ra=0

to /etc/sysctl.conf and reloading it by sysctl.

How can I configure an interface statically with global IPv6 address?

Use the standard /etc/network/interfaces file on Debian/Ubuntu systems:

    iface eth0 inet6 static
        address dead:beef::1
        netmask 64

You can add a static default gateway if you want to ignore router advertisements:

    iface eth0 inet6 static
        address dead:beef::1
        netmask 64
        gateway dead:beef::

Please note, you cannot bring up just the IPv6 settings of an interface, so in order your changes take effect you have to issue the commands

# ifdown eth0
# ifup eth0

which brings down IPv4 on your interface.

-  ⇤ ← Revision 2 as of 2006-12-05 12:40:01 → 
  Size: 257
  Editor: kadlecsik
  Comment:
+   ← Revision 9 as of 2006-12-05 13:12:34 → ⇥
  Size: 1954
  Editor: kadlecsik
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 3:
-Ubuntu dapper default supports IPv6, so you have to do nothing. If you want do disable IPv6 globally, please read [:disableIPv6:our section] on how to do it.
+Ubuntu dapper default supports IPv6, so you have to do nothing to enable IPv6. If you want do disable IPv6 globally, please read [:IPv6hostslinux disableIPv6:our section] on how to do it.

== How can I enable forwarding between IPv6 enabled interfaces? ==
In {{{/etc/sysctl.conf}}} add the line

{{{
net/ipv6/conf/all/forwarding=1}}}
and run

{{{
# sysctl -p /etc/sysctl.conf}}}
Please note, you cannot enable/disable IPv6 forwarding per interface as in the IPv4 case. If you want to disable IPv6 forwarding for some interfaces, use netfilter/p6tables.

== How can I enable/disable autoconfiguration on all interfaces? ==
Autoconfiguration is enabled by default. If you want to disable it for all interfaces, add the line

{{{
net/ipv6/conf/all/autoconf=0}}}
to {{{/etc/sysctl.conf}}} and reload the file by {{{sysctl}}} as it is shown above.

== How can I enable/disable router behaviour (i.e not to accept router advertisements) on all devices? ==
The kernel default accepts router advertisements. You can disable it on all interfaces by adding the line

{{{
net/ipv6/conf/all/accept_ra=0}}}
to {{{/etc/sysctl.conf}}} and reloading it by {{{sysctl}}}.

== How can I configure an interface statically with global IPv6 address? ==
Use the standard {{{/etc/network/interfaces}}} file on Debian/Ubuntu systems:

{{{
    iface eth0 inet6 static
        address dead:beef::1
        netmask 64}}}
You can add a static default gateway if you want to ignore router advertisements:

{{{
    iface eth0 inet6 static
        address dead:beef::1
        netmask 64
        gateway dead:beef::}}}

Please note, you cannot bring up just the IPv6 settings of an interface, so in order your changes take effect you have to issue
the commands

{{{
# ifdown eth0
# ifup eth0}}}

which brings down IPv4 on your interface.