can't make ipv4 dhcp and ipv6 static both exist

[James Knott]

A couple of things.  First off, my experience is with openSUSE, not
Debian.  However, in my experience, bridges don't usually have IP
addresses, as they work at level 2, not 3.  Also, it's generally not
necessary to use static IPv6 addresses.  The two common methods are MAC
based and random number addresses.  It is possible to have both on one
interface.  Of course, the other two options are static and DHCP.  I
also see you're assigning a gateway address.  Again, that's generally
not necessary with IPv6, as routers advertise themselves.

On my home network, I run a few computers, along with a smart phone and
tablet and I've never had to configure an IPv6 address or router on any
of them.  It just works automagically.  I get my IPv6 subnet from a
tunnel broker and other than the firewall, I didn't have to do any
address configuration at all.  The router learned my subnet from the
tunnel and all the devices addresses are MAC based or random and all
just work.  This is one of the (many) benefits of IPv6.

BTW, I have a /56 subnet, which is 2^72 addresses, or about a trillion
times the entire IPv4 address space.



Neil Watson wrote:
> Greetings,
>
> On a debian laptop I have the following interfaces file. For some
> reason the
> IPV6 address will not set. Why?
>
> auto lo br0
> iface lo inet loopback
> iface lo inet6 loopback
>
> allow-hotplug br0 wlan0
>
> iface br0 inet dhcp
>         bridge_ports eth0
>         bridge_stop off
>         bridge_fd 0
>         bridge_maxwait 0
>
> iface br0 inet6 static
>         address 2001:470:1d:a2f::4
>         netmask 64
>         gateway 2001:470:1d:a2f::1
>
>
> root at neptune:/etc/network# ifconfig
> br0       Link encap:Ethernet  HWaddr f0:de:f1:d8:0d:87           inet
> addr:172.16.100.19  Bcast:172.16.100.255  Mask:255.255.255.0
>           inet6 addr: fe80::f2de:f1ff:fed8:d87/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:1965 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:1647 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:1511472 (1.4 MiB)  TX bytes:217730 (212.6 KiB)
>
> eth0      Link encap:Ethernet  HWaddr f0:de:f1:d8:0d:87           UP
> BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:7437 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:4924 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:7126724 (6.7 MiB)  TX bytes:650467 (635.2 KiB)
>           Interrupt:20 Memory:f2500000-f2520000
>
> lo        Link encap:Local Loopback           inet addr:127.0.0.1 
> Mask:255.0.0.0
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:65536  Metric:1
>           RX packets:10 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:1380 (1.3 KiB)  TX bytes:1380 (1.3 KiB)
>

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