BIND trying to use IPv6 for recursion

Ian Pilcher arequipeno at gmail.com
Fri Jan 13 17:55:08 UTC 2012 

On 01/13/2012 11:50 AM, Bill Owens wrote:
> I'm not familiar with CentOS, but I would be surprised to hear that any modern Linux distro didn't have IPv6 enabled by default; you should see at least link-local addresses on your active interfaces (address family inet6, beginning with fe80::) I'm only pointing that out because if you're *not* seeing those, it is possible that the tool you're using to look for IPv6 isn't working correctly.
> 
> If you're actually ahead of that point and really saying that none of your interfaces have *global* IPv6 interfaces, then the only other thing I could suggest is looking to make sure you don't have a tunnel interface for 6to4; I don't think that would be enabled by default, though. 

I've specifically disabled all IPv6 addresses by setting

  net.ipv6.conf.all.disable_ipv6 = 1

in /etc/sysctl.conf.

Here is the output of ifconfig -a:

eth0      Link encap:Ethernet  HWaddr 00:1D:92:E0:1F:CA
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:11646099 errors:0 dropped:0 overruns:0 frame:0
          TX packets:12036575 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:3309972864 (3.0 GiB)  TX bytes:413719638 (394.5 MiB)
          Interrupt:18 Base address:0x6000

eth0.1    Link encap:Ethernet  HWaddr 00:1D:92:E0:1F:CA
          inet addr:172.31.1.254  Bcast:172.31.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1 errors:0 dropped:0 overruns:0 frame:0
          TX packets:24846 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:42 (42.0 b)  TX bytes:6822472 (6.5 MiB)

eth0.4    Link encap:Ethernet  HWaddr 00:1D:92:E0:1F:CA
          inet addr:172.31.4.254  Bcast:172.31.4.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2811 errors:0 dropped:0 overruns:0 frame:0
          TX packets:25330 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:387927 (378.8 KiB)  TX bytes:6842944 (6.5 MiB)

eth0.250  Link encap:Ethernet  HWaddr 00:1D:92:E0:1F:CA
          inet addr:172.31.250.254  Bcast:172.31.250.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3554107 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5217588 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:391721413 (373.5 MiB)  TX bytes:2146319157 (1.9 GiB)

eth0.251  Link encap:Ethernet  HWaddr 00:1D:92:E0:1F:CA
          inet addr:172.31.251.254  Bcast:172.31.251.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:778516 errors:0 dropped:0 overruns:0 frame:0
          TX packets:745701 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:166482724 (158.7 MiB)  TX bytes:170442196 (162.5 MiB)

eth0.252  Link encap:Ethernet  HWaddr 00:1D:92:E0:1F:CA
          inet addr:172.31.252.254  Bcast:172.31.252.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3365 errors:0 dropped:0 overruns:0 frame:0
          TX packets:29609 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:216141 (211.0 KiB)  TX bytes:13769389 (13.1 MiB)

eth0.253  Link encap:Ethernet  HWaddr 00:1D:92:E0:1F:CA
          inet addr:172.31.253.254  Bcast:172.31.253.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:979426 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1562642 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:85292751 (81.3 MiB)  TX bytes:1766913359 (1.6 GiB)

eth0.254  Link encap:Ethernet  HWaddr 00:1D:92:E0:1F:CA
          inet addr:172.31.254.254  Bcast:172.31.254.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:24846 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:6870228 (6.5 MiB)

eth0.255  Link encap:Ethernet  HWaddr 00:1D:92:E0:1F:CA
          inet addr:172.31.255.1  Bcast:172.31.255.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:6327801 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4406015 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2502811591 (2.3 GiB)  TX bytes:590708249 (563.3 MiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:4396 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4396 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:247734 (241.9 KiB)  TX bytes:247734 (241.9 KiB)

-- 
========================================================================
Ian Pilcher                                         arequipeno at gmail.com
"If you're going to shift my paradigm ... at least buy me dinner first."
========================================================================

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