Why do the interfaces show ipv6 address along with ipv4

Posted by nixnotwin on Ask Ubuntu See other posts from Ask Ubuntu or by nixnotwin
Published on 2011-01-26T07:34:57Z Indexed on 2011/01/28 23:38 UTC
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IPv6

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interface

I have manually specified only ipv4 address for my interfaces. But all the interfaces automatically show inet6 address as well. Does it mean that ubuntu starts an ipv6 tunnel by default. If it does, isn't it dangerous, as ipv6 assigns public ips for all LAN clients. I only have a firewall on my NAT router, and my clients, who's interfaces show ipv6 address, do not have firewalls. Here is a screenshot:

eth0      Link encap:Ethernet  HWaddr 34:dc:47:2e:ad:13
          inet6 addr: fe80::28cf:38ff:fb7b:da19/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:5783 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6098 errors:0 dropped:0 overruns:0 carrier:1
          collisions:0 txqueuelen:1000
          RX bytes:2961324 (2.9 MB)  TX bytes:1573757 (1.5 MB)
          Interrupt:46

Note: For privacy reasons I have modified the HWaddr and inet6 addr values.

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