title: bind9 reverse zone not updating correctly
body: <p>I've been trying to learn how to setup isc-dhcp-server and bind9 for dynamic dns service within my home LAN.  I've followed a few how-tos online and managed to get it working, with one exception that my reverse zone doesn't seem to be getting updated correctly.  I know it's not quite right because if I do <code>dig raspbmc.home</code> (forward lookup) I get an answer back with the correct IP address of my raspberry pi, which is 192.168.1.12, but if I do <code>dig -x 192.168.1.12</code> I don't get an answer.  Reverse lookups on any IP address in my subnet don't give any answer, except for the DNS/DHCP server itself which has a static IP address.  I ran <code>sudo rndc sync</code> to update my zone files.  Here is the forward zone file:</p>
  
  <pre><code>$ORIGIN .
  $TTL 907200 ; 1 week 3 days 12 hours
  home            IN SOA  IXTREME.home. justin.IXTREME.home. (
                  7          ; serial
                  10800      ; refresh (3 hours)
                  3600       ; retry (1 hour)
                  604800     ; expire (1 week)
                  38400      ; minimum (10 hours 40 minutes)
                  )
              NS  IXTREME.home.
              A   192.168.1.2
  $ORIGIN home.
  $TTL 3600   ; 1 hour
  android A   192.168.1.5
              TXT "317532858ab461b8e08e92465158353660"
  iPad        A   192.168.1.10
              TXT "31fc08f1797f8ef06bf8bbd71c6889c2c3"
  printer     A   192.168.1.3
              TXT "31445a58fc15ac8a0c45ca7f81d62dc2ba"
  laptop      A   192.168.1.6
              TXT "31b7f1f9e90f391d8733427cd4f783363f"
  $TTL 907200 ; 1 week 3 days 12 hours
  IXTREME         A   192.168.1.2
  $TTL 3600   ; 1 hour
  iPhone      A   192.168.1.7
              TXT "31ff1a903b509d454737f163433b50e979"
  raspbmc         A   192.168.1.12
              TXT "319a34a5c33f22852155f1d0d79d29b7c9"
  </code></pre>
  
  <p>And  the reverse zone file ...</p>
  
  <pre><code>$ORIGIN .
  $TTL 907200 ; 1 week 3 days 12 hours
  1.168.192.in-addr.arpa  IN SOA  IXTREME.home. justin.IXTREME.home. (
                  7          ; serial
                  10800      ; refresh (3 hours)
                  604800     ; retry (1 week)
                  604800     ; expire (1 week)
                  86400      ; minimum (1 day)
                  )
              NS  IXTREME.home.
  $ORIGIN 1.168.192.1.168.192.in-addr.arpa.
  $TTL 3600   ; 1 hour
  10          PTR iPad.home.
  12          PTR raspbmc.home.
  3           PTR printer.home.
  5           PTR android.home.
  6           PTR laptop.home.
  7           PTR iPhone.home.
  $ORIGIN 1.168.192.in-addr.arpa.
  $TTL 907200 ; 1 week 3 days 12 hours
  2           PTR IXTREME.home.
  </code></pre>
  
  <p>The line <code>$ORIGIN 1.168.192.1.168.192.in-addr.arpa.</code> in the reverse zone file doesn't look right ... this should be <code>$ORIGIN 1.168.192.in-addr.arpa.</code>.  This line has been added automatically by isc-dhcp-server.  Can anybody help me troubleshoot this?</p>
  
  <p>Thanks - JJB</p>