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by anonymous

Hello

we've got the following problem. The DNS is not resolving correct. Here's a part of the TCP-dump.

1733 16.442012 192.168.254.201 192.168.254.1 DNS 84 Standard query 0x0004 A <url-name>
1734 16.442012 192.168.254.201 192.168.254.1 DNS 84 Standard query 0x0004 A <url-name>
1735 16.442680 172.24.200.70 172.17.10.1         DNS 84 Standard query 0xa117 A <url-name>
1736 16.442914 172.24.200.70 1.1.1.1                 DNS 84 Standard query 0xa117 A <url-name>
1737 16.448574 172.17.10.1 172.24.200.70         DNS 100 Standard query response 0xa117 A <url-name> A 192.168.60.230
1738 16.449172 192.168.254.1 192.168.254.201 DNS 84 Standard query response 0x0004 A <url-name>
1739 16.449218 192.168.254.1 192.168.254.201 DNS 84 Standard query response 0x0004 A <url-name>

192.168.254.201 = client
192.168.254.1 = RUT950 - LAN site
172.24.200.70 = RUT950 - WAN site
172.17.10.1 = Internal DNS

In the dump we see that there is a DNS resolving of the <url-name>. But the RUT950 is not sending it to the client.
And the RUT950 tries both DNS servers. the internal and 1.1.1.1

With regards Martin

1 Answer

0 votes
by anonymous
Hello,

Disable Rebind protection in the DNS options.

Regards,
by anonymous
Hello

Thanks for the reply. It solved the problem.

Regards.
by anonymous
Thanks for this, but I am really interested why turning off this option solves this problem. This option is turned on by default.
by anonymous

When rebind protection is enabled the resolver strips private IP addresses from replies. When it is disabled replies containing private addresses are not modified.