I have a couple of name servers which are not pingable. I have them in my hosts.cfg as follows:
10.10.10.10 ns1-int.foo.com # noconn dns=ns1.foo.com
0.0.0.0 ns2-int.foo.com # noconn dns=ns2.foo.com
The first returns a green dns test result. The second returns a red "Service dns on ns2-int.foo.com is not OK : Service unavailable." I can't figure out why. I don't want to embed ip addresses in my hosts.cfg, and I can't think why I should need to.
There is nothing telling when I run the test interactively with:
xymoncmd xymonnet --no-update --debug ns1-int.foo.com
nor for ns2-int.foo.com
When I snoop the interface while doing the above tests, the differences are significant:
For ns1-int, I see xymon lookup ns1-int on the normal name server.
Then I also see it request ns1.foo.com from ns1-int.foo.com and get the correct response. I'm not sure why the reverse lookup is there.
xymona -> d.foo.com DNS C ns1-int.foo.com. Internet Addr ?
d.foo.com -> xymona DNS R ns1-int.foo.com. Internet Addr 10.10.10.10
xymona -> ns1-int.foo.com DNS C ns1.foo.com. Internet Addr ?
ns1-int.foo.com -> xymona DNS R ns1.foo.com. Internet Addr 192.168.123.1
xymona -> d.foo.com DNS C 10.10.10.10.in-addr.arpa. Internet PTR ?
d.foo.com -> xymona DNS R 10.10.10.10.in-addr.arpa. Internet PTR ns1-int.foo.com.
For ns2-int, however, the result is much simpler. I see xymon lookup ns2-int on the normal name server. . . . and then nothing.
xymona -> d.foo.com DNS C ns2-int.foo.com. Internet Addr ?
d.foo.com -> xymona DNS R ns2-int.foo.com. Internet Addr 10.20.20.20
When I change the line in hosts.cfg for ns2-int from 0.0.0.0 to an ip address, it works fine.
What is going on here? Why isn't the DNS test using the address it has obviously retrieved from DNS?
--
Do things because you should, not just because you can.
John Thurston XXX-XXX-XXXX
user-ce4d79d99bab@xymon.invalid
Enterprise Technology Services
Department of Administration
State of Alaska