No response via UDP - knot-dns-users

11 Bře 2013

Hello,

I'm pretty sure I have tomatoes (or other vegetables) on my eyes, but
Knot won't answer UDP queries here, running on Centos 6.3 in an OpenVZ
container. This is the minimal configuration and the results I'm seeing:

$ knotc -V
Knot DNS, version 1.2.0-rc3

$ cat knot.sample.conf 
system {
  identity "knot 1.2-rc2";
  storage "/etc/knot";
}

interfaces {
  my-iface { address 127.0.0.1@53; }
}

zones {
  example.com {
    file "example.com.zone";
  }
}

log {
  syslog { any info, debug, notice, warning, error; }
}

$ knotc -c knot.sample.conf start
2013-03-11T18:07:44.244202+01:00 Starting server...
2013-03-11T18:07:44.244337+01:00 Zone 'example.com.' is up-to-date.

$ netstat -anp
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State      
PID/Program name   
tcp        0      0 127.0.0.1:53                0.0.0.0:*                   LISTEN     
11408/knotd         
tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN     
486/sshd            
tcp        0      0 172.16.153.104:22           172.16.153.1:64881          ESTABLISHED
554/sshd            
tcp        0      0 :::22                       :::*                        LISTEN     
486/sshd            
udp        0      0 127.0.0.1:53                0.0.0.0:*                              
11408/knotd         
unix  2      [ ]         DGRAM                    8840414 11408/knotd         

$ dig @127.0.0.1 example.com any

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.6 <<>> @127.0.0.1
example.com a
; (1 server found)
;; global options: +cmd
;; connection timed out; no servers could be reached

$ dig +tcp @127.0.0.1 example.com a

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.10.rc1.el6_3.6 <<>> +tcp
@127.0.0.1 example.com a
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20248
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;example.com.			IN	A

;; AUTHORITY SECTION:
example.com.		60	IN	SOA	localhost. root.localhost. 1997022700 28800 14400 3600000 86400

;; Query time: 2 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon Mar 11 18:08:32 2013
;; MSG SIZE  rcvd: 79

Mar 11 18:07:44 knot knot[11408]: Binding to interface 127.0.0.1 port 53.
Mar 11 18:07:44 knot knot[11408]: Configured 1 interfaces and 1 zones.
Mar 11 18:07:44 knot knot[11408]: 
Mar 11 18:07:44 knot knot[11408]: Loading 1 compiled zones...
Mar 11 18:07:44 knot knot[11408]: Loaded zone 'example.com.' serial 1997022700
Mar 11 18:07:44 knot knot[11408]: Loaded 1 out of 1 zones.
Mar 11 18:07:44 knot knot[11408]: Starting server...
Mar 11 18:07:44 knot knot[11408]: Server started as a daemon, PID = 11408
Mar 11 18:07:44 knot knot[11408]: PID stored in /etc/knot/knot.pid

Can you please help me open my eyes?

Thanks,

        -JP