John_Gill Trusted Contributor.
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IP address disappear for the domain zone

Hi,

Running 2 dns/dhcp servers as VM's with SLES11 sp3 with OES11 sp2. DNS and DHCP have been working perfectly for a number of years.

One of my windoze servers now has the following issue. I config DCHP to issue a reserved IP (10.1.3.106) for the server. I restart the DHCP with "rcnovell-dhcpd restart" and plug the network cable into the port. All is good as the server gets an IP, mask, gateway, tree etc etc...

I go to the DNS/DHCP java console and manually add the name and IP address to the domain and in-addr-arpa zones and nslookup and pings work to the server... all is still good. Now, anywhere from 15 minutes to 2 hours later, users phone to save the server is unreachable. I look in the console and the name entry is there but the IP address has disappeared from the domain zone. The IP and name still exists in the in-addr-arpa zone.

I then delete the name from the domain zone and re-add the entry and restart the dns service (rc-novell-named restart) on both servers and all is good for a while and then the same issue starts again .... endless loop.

I have restarted both DNS servers and the problem server, but still no joy. eDir is 100% and so is NTP. Ideas and suggestions would be most welcome.

Regards
John
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John_Gill Trusted Contributor.
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Re: IP address disappear for the domain zone

mmmmh, things that go bump in the night ..... I "moved" the problem server to a different sub-net and all was good for an hour, so "moved" the server back. mutter mutter, curse, still no joy. During the night, something went bump and DNS has not lost the IP address. The system has been stable for a few days, so all is good in my I.T. world or until the ghost in the machine rears it ugly head .....
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Re: IP address disappear for the domain zone

In article <John_Gill.8ihs9c@no-mx.forums.microfocus.com>, John Gill
wrote:
> I look in
> the console and the name entry is there but the IP address has
> disappeared from the domain zone. The IP and name still exists in the
> in-addr-arpa zone.
>
> I then delete the name from the domain zone and re-add the entry and
> restart the dns service (rc-novell-named restart) on both servers and
> all is good for a while and then the same issue starts again ....
> endless loop.


Sorry for delay, why is it that having a special day(b-day) means
everything lands on it?
Glad it healed itself, and that adds evidence to a possible root cause,
that eDir was having issues syncing. I would recommend running some
basic eDir health checks on each of the eDir boxes. Assuming all Linux
of some flavor, just run each of the commands on each box and drill into
any errors that show
ndsrepair -T
ndsrepair -E
ndsrepair -C -Ad -A
all it would take is for server times to have been off to cause the
behaviour you say, so make sure your NTP servers you are pointing to
are; common(the same set), fairly local, and NOT a vm (even Windoze is
better than anything in a vm for offering consistant NTP services).


Andy of
http://KonecnyConsulting.ca in Toronto
Knowledge Partner
http://forums.novell.com/member.php/75037-konecnya
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John_Gill Trusted Contributor.
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Re: IP address disappear for the domain zone

Hi,

Thanks for your input. I did run the ndsrepair on the 2 physical and 2 virtual (DNS/DHCP) servers and there were zero errors, but something must have clicked into place. As a side note, I had an eDir issue about 8 months back and a Novell guy in Rottedam, Netherlands, sorted it out. He also moved my timesync to my secondary DNS server, a VM, and I have not had any time sync issues since.

John (things that go bump in the night) Gill
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Knowledge Partner

Re: IP address disappear for the domain zone

In article <John_Gill.8iqv40@no-mx.forums.microfocus.com>, John Gill
wrote:
> ... moved my timesync to my secondary DNS server, a VM, and I have
> not had any time sync issues since.

As all the OES/eDir boxes partake in timesync, that doesn't directly
make much sense (might have in NetWare days, but thats not where you
said we are).
Timesyncronization is all through NTP, so if in a terminal session of
each of the servers you type
rcntp status
you will see where they are pointing to and the step beyond that, along
with other useful data on the stability of each of the ntp servers this
server is pointing to.
I typically try to have a pair of physical boxes (often part of the
backup systems or Networking gear, they don't have to be Micro Focus
boxes) as the main NTP source locally(i.e. They get from outside and
share internally) and have all the VMs point to them.

>John (things that go bump in the night) Gill

Does this mean you are one we can blame when we hear those bumps, or
that you want to track all those occurrences we might share with you 😉


Andy of
http://KonecnyConsulting.ca in Toronto
Knowledge Partner
http://forums.novell.com/member.php/75037-konecnya
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