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remove obsolete note on link local addresses

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Wolfgang Bumiller 2016-10-05 11:48:45 +02:00 committed by Dietmar Maurer
parent bc1c71d47e
commit b6ee2d0ebc
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pve-firewall.adoc
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@ -458,69 +458,6 @@ NFQUEUE=0
----
Avoiding `link-local` Addresses on `tap` and `veth` Devices
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
With IPv6 enabled by default every interface gets a MAC-derived link local
address. However, most devices on a typical {pve} setup are connected to a
bridge and so the bridge is the only interface which really needs one.
To disable a link local address on an interface you can set the interface's
`disable_ipv6` sysconf variable. Despite the name, this does not prevent IPv6
traffic from passing through the interface when routing or bridging, so the
only noticeable effect will be the removal of the link local address.
The easiest method of achieving this setting for all newly started VMs is to
set it for the `default` interface configuration and enabling it explicitly on
the interfaces which need it. This is also the case for other settings such as
`forwarding`, `accept_ra` or `autoconf`.
Here's a possible setup:
.File `/etc/sysconf.d/90-ipv6.conf`
----
net.ipv6.conf.default.forwarding = 0
net.ipv6.conf.default.proxy_ndp = 0
net.ipv6.conf.default.autoconf = 0
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.default.accept_ra = 0
net.ipv6.conf.lo.disable_ipv6 = 0
----
.File `/etc/network/interfaces`
----
(...)
# Dual stack:
iface vmbr0 inet static
address 1.2.3.4
netmask 255.255.255.128
gateway 1.2.3.5
iface vmbr0 inet6 static
address fc00::31
netmask 16
gateway fc00::1
accept_ra 0
pre-up echo 0 > /proc/sys/net/ipv6/conf/$IFACE/disable_ipv6
# With IPv6-only 'pre-up' is too early and 'up' is too late.
# Work around this by creating the bridge manually
iface vmbr1 inet manual
pre-up ip link add $IFACE type bridge
up echo 0 > /proc/sys/net/ipv6/conf/$IFACE/disable_ipv6
iface vmbr1 inet6 static
address fc00:b:3::1
netmask 96
bridge_ports none
bridge_stp off
bridge_fd 0
bridge_vlan_aware yes
accept_ra 0
(...)
----
Notes on IPv6
-------------