DNS Query

[jezuk1]

Hi folks,

Something interesting happened this evening with my router's DNS configuration. I noticed the IPv6 DNS autoconfiguration changed and the link local address of the router has been replaced with 2001:470:20::2 (ordns.he.net). This has broken resolution for static DNS entries because Windows queries the configured IPv6 server first, which is no longer the router. I'm using a Billion 7800N and it has an option for IPv4 "Use Router as DNS Server" but I can't find an option to override this in the IPv6 Autoconfig section of the web interface.

I honestly don't know enough about IPv6 to know why this has happened, all I know is the change happened at 19:41 and there are some events in the router's syslog at this exact moment, although they relate to IPv4. Something obviously happened at this exact moment in time but I don't have enough information to know what.

Code Select Expand

Oct 14 19:41:49 gateway   gateway dnsmasq[91]: using nameserver 212.69.36.3#53
Oct 14 19:41:49 gateway   gateway dnsmasq[91]: using nameserver 212.69.40.3#53
Oct 14 19:42:48 gateway   gateway dnsmasq[91]: using nameserver 212.69.36.3#53
Oct 14 19:42:48 gateway   gateway dnsmasq[91]: using nameserver 212.69.40.3#53

The interim solution has been to manually configure IPv6 DNS in Windows to the router, instead of 2001:470:20::2 (ordns.he.net)

Any ideas?

[Steve]

Ordns.he.net that's the Hurricane Electric an iPv4 to IPv6 tunnel broker isn't it?

[jezuk1]

I've solved this by configuring my own BIND caching nameserver on my Linux box, and setting the 7800N to issue this out to clients on 4 and 6. Couldn't immediately find any better solution and in fact this is working really well

[Steve]

Good news but did you every figure out where the HE DNS came from?

[pctech]

You haven't tinkered with Hurricane Electric's Tunnelbroker service at any point have you?

[jezuk1]

Good news but did you every figure out where the HE DNS came from?

I never did manage to work out where it came from, bit of a mystery.

You haven't tinkered with Hurricane Electric's Tunnelbroker service at any point have you?

No, never tinkered with either I'm afraid!

[brian_idnet]

Hi,

I have asked our network team to take a look and check to ensure we are sending out the correct IPv6 DNS addresses and will let you know.

Regards,

Brian
IDNet

[brian_idnet]

Hi,

Please can you reboot and retest to check what server addresses you now get?

regards,

Brian
IDNet

[jezuk1]

Hi Brian

I've actually reconfigured the router to issue out the static IPv6 address of the caching nameserver I'm using locally. I'll set it back to auto tomorrow and let you know what gets assigned (the 7800N seems to require a restart after changing this specific part of the configuration)

Thanks
Jez

[jane]

I think I am seeing this as well (please correct me if I am wrong).
From ipconfig /all

DNS Servers . . . . . . . . . . . : 2001:470:20::2
                                            192.168.1.254

I noticed it when using ProcMon. svchost.exe UDP traffic >ordns.he.net:domain

I am also using the Billion 7800N. Should I reboot?