Anonymous_User Absent Member.
Absent Member.
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Nslookup problem - one hostname with two dns names

Hi,

We're on NW6.5 SP3.. We have 2 windows servers running databases that we
want users to access in a load-balanced manner. We've created a round-robin
dns entry called 'Transformprod' which has the ip addresses of both servers
associated with it, and it randomly responds either one or the other. This
works well.

However a windows backup server running Legato which tries to backup the
servers themselves sometimes runs into an issue where it tries to backup one
of the servers but ends up trying to connect to 'Transformprod' instead, and
fails. I'm guessing that it tries to connect to one of the servers (e.g.
W2Sunbpp02), performs an nslookup to get the ip address but somehow gets
Transformprod in the response instead of the actual server name.

If I perform nslookups on one of the servers addresses, I sometimes get the
actual servername, sometimes Transformprod. I'd expect to get both, ideally
first the actual server then the Transformprod name afterwards.

Could this be because Transformprod comes first alphabetically in the zone?
Or because the reverse lookup entry lists Transformprod first, then the
server name?

Any suggestions?



Steve Law


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2 Replies
Anonymous_User Absent Member.
Absent Member.

Re: Nslookup problem - one hostname with two dns names

In article <LnMye.2612$cZ.338@prv-forum2.provo.novell.com>, SLaw wrote:
> However a windows backup server running Legato which tries to backup the
> servers themselves sometimes runs into an issue where it tries to backup one
> of the servers but ends up trying to connect to 'Transformprod' instead
>

Is the backup software doing a reverse lookup? If you haven't entered
'Transformprod' into the app's config anywhere, that's all I can think of that
would cause this.

> If I perform nslookups on one of the servers addresses, I sometimes get the
> actual servername, sometimes Transformprod. I'd expect to get both
>

I'd expect both as well, and that is what I get from my NW 6.0 server. My 6.5
server is "under construction" so can't be used for testing right now. Does a
packet trace reveal any more info on this?

bd
NSC Volunteer SysOp


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Anonymous_User Absent Member.
Absent Member.

Re: Nslookup problem - one hostname with two dns names

I just confirmed that my NW 6.5 SP3 server also returns both ptr
records when doing an nslookup against it.

bd
NSC Volunteer SysOp


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