Weird ipv6 behavior

What’s happening here? Is this a strange bug?


% /sbin/ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:13:20:4F:60:1A  
          inet addr:131.156.145.144  Bcast:131.156.145.255  Mask:255.255.255.0
          inet6 addr: fec0::b:213:20ff:fe4f:601a/64 Scope:Site
          inet6 addr: 2002:839c:9172:b:213:20ff:fe4f:601a/64 Scope:Global
          inet6 addr: fe80::213:20ff:fe4f:601a/64 Scope:Link
          inet6 addr: fec0::b:d129:201b:d23c:af3/64 Scope:Site
          inet6 addr: 2002:839c:9172:b:d129:201b:d23c:af3/64 Scope:Global
          inet6 addr: fec0::b:24a6:344d:56b9:4b4d/64 Scope:Site
          inet6 addr: 2002:839c:9172:b:24a6:344d:56b9:4b4d/64 Scope:Global
          inet6 addr: 2002:839c:9172:b:d092:1e54:3e05:3143/64 Scope:Global
          inet6 addr: fec0::b:d092:1e54:3e05:3143/64 Scope:Site
          inet6 addr: fec0::b:cc60:d598:faaf:44ce/64 Scope:Site
          inet6 addr: 2002:839c:9172:b:cc60:d598:faaf:44ce/64 Scope:Global
          inet6 addr: 2002:839c:9172:b:c4b9:d3f6:9572:bf4f/64 Scope:Global
          inet6 addr: fec0::b:c4b9:d3f6:9572:bf4f/64 Scope:Site
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1036109 errors:0 dropped:51928 overruns:0 frame:0
          TX packets:27535 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:132851458 (126.6 Mb)  TX bytes:4152508 (3.9 Mb)

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:265 errors:0 dropped:0 overruns:0 frame:0
          TX packets:265 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:45776 (44.7 Kb)  TX bytes:45776 (44.7 Kb)

In case it is not clear, I am asking why eth0 has 13 ipv6 addresses.

This is 12.1. The system was installed about 1 week ago. When I ran that “ifconfig” it had been up for a little under 5 days since the last reboot. I have since rebooted, and the problem has not yet shown up.

The network is handled with “ifup”. It is set to use DHCP to get an ipv4 address, but no ipv6 address. I did not disable ipv6 support.