Unbound does not response a forwarded query
adrian at favap.com
Tue Feb 28 05:16:02 UTC 2017
When I check Unbound cache, it shows
unbound-control dump_cache|grep mine.intra
file.mine.intra. 86387 IN A 10.3.3.50
msg file.mine.intra. IN A 33152 1 47 1 1 0 0
file.mine.intra. IN A 0
3 records about file.mine.intra are generated by one client query.
------------------ Original ------------------
From: "Adrian Zhang via Unbound-users"<unbound-users at unbound.net>;
Date: Tue, Feb 28, 2017 10:59 AM
To: "unbound-users"<unbound-users at unbound.net>;
Subject: Unbound does not response a forwarded query
I am using unbound to forward mine.intra which is a private domain of Microsoft Windows Active Directory due to DNS server on Windows server has the record.
first of all, there is a record file.mine.intra created on DNS server on Windows, and works for clients via running "dig file.mine.intra @IP-OF-WINDOWS".
Second, create forward configuration in unbound.conf and restart Unbound, details are listed below. But Unbound is not able to response to client which run "dig file.mine.intra at IP-OF-UNBOUND"
(10.3.3.21 is dc1 of mine.intra, 10.3.3.22 is dc2 of mine.intra.)
Finally, I use tcpdump -w to catch packages and save to a file to see that happens. Then using Wireshark to open capture file I get below result.
Time source. Dest. Protocol. Length. Info.
7.841795 client_ip. Unbound_ip. DNS 76 Standard query 0xb80a A file.mine.intra
7.842781 Unbound_ip Windows_ip. DNS 87 Standard query 0xdece A file.mine.intra OPT
7.843769. ReltekU_e9:.. Broadcast ARP 60 Who has IP_OF_Unbound? Tell IP_OF_Windows
7.843788. ReltekU_64.. ReltekU_e9:.. ARP 42 IP_OF_Unbound is at 52:54:00:64:37:c7
7.844291. Windows_ip. Unbound_ip. DNS 103 Standard query response 0xdece A file.mine.intra A 10.3.3.50 OPT
7.844761. Unbound_ip. 188.8.131.52. DNS 70 Standard query 0x8762 NS <ROOT> OPT
Clearly Windows response the query but Unbound do not receive it and forward response to client, however it continually query ROOT DNS. BTW, these is also standard private domain forwarding settings (same format like above) in the same unbound.conf and works well, such as my-private-domain.com forwarded to a BIND server.
Why this happens and how to make Unbound response client if query a host in xxx.intra?
Thanks in advance.
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