[Dnsmasq-discuss] DNS server doesn't forward the PTR response from upstream server

Patrick DENG kldeng05 at gmail.com
Mon Jul 4 03:44:14 BST 2016


Hi, all

I have a VM (192.168.0.99) with dns server 192.168.0.3 and there is a
dnsmasq process running on it with a upstream dns server.

And when i ping a domain like so.com, it will last about 5~6 seconds before
print the response.
The tcpdump shows the dns reverse lookup blocks the ping output. The
upstream dns server return the result of PTR request, but the dns server
(192.168.0.3) doesn't forward the response to the VM.

18:06:59.781814 IP 192.168.0.99.48523 > 192.168.0.3.53: 44607+ A? so.com.
(24)
18:06:59.782082 IP 192.168.0.3.50872 > <upstream-server>.53: 55885+ A?
so.com. (24)
18:06:59.867878 IP <upstream-server>.53 > 192.168.0.3.50872: 55885 1/0/0 A
106.120.160.134 (40)
18:06:59.868118 IP 192.168.0.3.53 > 192.168.0.99.48523: 44607 1/0/0 A
106.120.160.134 (40)
18:06:59.914170 IP 192.168.0.99.50664 > 192.168.0.3.53: 62022+ PTR?
134.160.120.106.in-addr.arpa. (46)
18:06:59.914552 IP 192.168.0.3.46386 > <upstream-server>.53: 16393+ PTR?
134.160.120.106.in-addr.arpa. (46)
18:06:59.914845 IP <upstream-server>.53 > 192.168.0.3.46386: 16393 NXDomain
0/0/0 (48)


Any help would be appreciated. Thx!
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