[Dnsmasq-discuss] how to track changes for a given hostname

[Olaf Hering]

My dnsmasq sometimes forgets the hostname of one of my boxes. I wonder
how to track that without tweaking the source?

My reconnect script reports:
...
ssh: connect to host optiplex port 22: Connection refused
rc '255'. root at optiplex @ Fr 30. Mai 11:27:43 CEST 2014
ssh: connect to host optiplex port 22: Connection refused
rc '255'. root at optiplex @ Fr 30. Mai 11:29:01 CEST 2014
ssh: Could not resolve hostname optiplex: Name or service not known
rc '255'. root at optiplex @ Fr 30. Mai 11:30:20 CEST 2014
ssh: Could not resolve hostname optiplex: Name or service not known
rc '255'. root at optiplex @ Fr 30. Mai 11:31:40 CEST 2014
...


My setup is like this:

 * A FritzBox 7360, which acts as DHCP and DNS server.
 * My Workststation running openSUSE 11.4, with dnsmasq-2.70, it acts as DNS
   for localhost and as DHCP proxy to provide TFTP to other hosts.
   Compile time options: IPv6 GNU-getopt no-DBus i18n IDN DHCP DHCPv6
   no-Lua TFTP no-conntrack ipset auth no-DNSSEC

 * A Testhost named optiplex. It is reachable with IPv4 and IPv6.

When the failure above happens, my workstation fails to resolve
optiplex. Restarting dnsmasq helps.

olaf at probook:~ $ host optiplex
olaf at probook:~ $ host optiplex fritz.box
Using domain server:
Name: fritz.box
Address: fd00::a96:d7ff:feb1:1e3d#53
Aliases: 

optiplex.fritz.box has address 192.168.2.102
optiplex.fritz.box has IPv6 address 2001:a60:1011:601:baac:6fff:fea3:7d0a
optiplex.fritz.box has IPv6 address 2001:a60:1011:601:30e6:8090:5088:397
optiplex.fritz.box has IPv6 address fd00::30e6:8090:5088:397
optiplex.fritz.box has IPv6 address fd00::baac:6fff:fea3:7d0a
olaf at probook:~ $ host optiplex 192.168.2.1
Using domain server:
Name: 192.168.2.1
Address: 192.168.2.1#53
Aliases: 

optiplex.fritz.box has address 192.168.2.102
optiplex.fritz.box has IPv6 address 2001:a60:1011:601:baac:6fff:fea3:7d0a
optiplex.fritz.box has IPv6 address 2001:a60:1011:601:30e6:8090:5088:397
optiplex.fritz.box has IPv6 address fd00::30e6:8090:5088:397
optiplex.fritz.box has IPv6 address fd00::baac:6fff:fea3:7d0a
olaf at probook:~ $ 

olaf at probook:~ $ sudo su -
root's password:
root at probook:~ # rcdnsmasq restart
Shutting name service masq caching server done
Starting name service masq caching server done
root at probook:~ # logout
olaf at probook:~ $ host optiplex
optiplex.fritz.box has address 192.168.2.102
optiplex.fritz.box has IPv6 address 2001:a60:1011:601:baac:6fff:fea3:7d0a
optiplex.fritz.box has IPv6 address 2001:a60:1011:601:30e6:8090:5088:397
optiplex.fritz.box has IPv6 address fd00::30e6:8090:5088:397
optiplex.fritz.box has IPv6 address fd00::baac:6fff:fea3:7d0a
olaf at probook:~ $ host optiplex fritz.box
Using domain server:
Name: fritz.box
Address: fd00::a96:d7ff:feb1:1e3d#53
Aliases: 

optiplex.fritz.box has address 192.168.2.102
optiplex.fritz.box has IPv6 address 2001:a60:1011:601:baac:6fff:fea3:7d0a
optiplex.fritz.box has IPv6 address 2001:a60:1011:601:30e6:8090:5088:397
optiplex.fritz.box has IPv6 address fd00::30e6:8090:5088:397
optiplex.fritz.box has IPv6 address fd00::baac:6fff:fea3:7d0a
olaf at probook:~ $ 


How can I find out why optiplex fails to resolve?


Olaf