Re: [Bugme-new] [Bug 9443] New: RFC4193 IPv6 addresses seem not to be completly supported : default gateway not set

On Fri, 23 Nov 2007 05:42:35 -0800 (PST) bugme-daemon@bugzilla.kernel.org wrote:

http://bugzilla.kernel.org/show_bug.cgi?id=9443

           Summary: RFC4193 IPv6 addresses seem not to be completly
                    supported : default gateway not set
           Product: Networking
           Version: 2.5
     KernelVersion: 2.6.22-3
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: IPV6
        AssignedTo: yoshfuji@linux-ipv6.org
        ReportedBy: guy.widloecher@vinci.com


Most recent kernel where this bug did not occur: unknown
Distribution: DEBIAN SID
Hardware Environment: tested on COMPAQ Deskpro EN and VMware Workstation
Software Environment: reproduced in Kernel Version 2.6.22-14 (UBUNTU)
Problem Description:

RFC4193 defines fc00::/8 and fd00::/8 IPv6 addresses known as "Local IPv6
addresses" and stated that "They are not expected to be routable on the global
Internet" and "They are routable inside of a more limited area such a site".
RFC4193 addresses are the equivalent of RFC1918 IPv4 addresses for IPv6.

When using this kind of address as "static" (iface ... static), the default
gateway is not set (see the result of the command route -6 : ::/0 route is
missing), so sending such IPv6 packets outside the local LAN is not possible.



Steps to reproduce:

debian:~# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug eth0
iface eth0 inet dhcp
iface eth0 inet6 static
  pre-up modprobe ipv6
  address fd12:3000:4000:5000::1
  netmask 64
  gateway fd12:3000:4000:5000::100
debian:~#

debian:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:B8:53:3B
          inet addr:192.168.19.135  Bcast:192.168.19.255 Mask:255.255.255.0
          inet6 addr: fd12:3000:4000:5000::1/64 Scope:Global
          inet6 addr: fe80::20c:29ff:feb8:533b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:262 errors:0 dropped:0 overruns:0 frame:0
          TX packets:141 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:28702 (28.0 KiB)  TX bytes:20060 (19.5 KiB)
          Interrupt:17 Base address:0x1080

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:16436  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:560 (560.0 b)  TX bytes:560 (560.0 b)

debian:~#

debian:~# route -6
Kernel IPv6 routing table
Destination                                 Next Hop     Flags Metric Ref   
Use Iface
::1/128                                     ::     U     0      4  1 lo
fd12:3000:4000:5000::1/128                  ::     U     0      0  1 lo
fd12:3000:4000:5000::/64                    ::     U     256    0  0 eth0
fe80::20c:29ff:feb8:533b/128                ::     U     0      0  1 lo
fe80::/64                                   ::     U     256    0  0 eth0
ff00::/8                                    ::     U     256    0  0 eth0
debian:~#

And adding the default route manually gives an error :

debian:~# route -A inet6 add ::/0 gw fd12:3000:4000:5000::100 eth0
SIOCADDRT: Invalid argument
debian:~#