topic Re: Problems with Tcpip and names in Operating System - OpenVMS

Problems with Tcpip and names

Kirsten Knüttel — Thu, 15 Jul 2004 05:25:24 GMT

Hello,

some strange things happen at the moment in our OpenVMS. First the Versions (OpenVMS 7.3-1, TCP/IP 5.3 Eco2). We use DHCP for our PCs.
We have 3 DNS-Servers, 2 Win2000 Servers and 1 OpenVMS-Server. First I used for VMS the VMS DNS-Server, now I try the Win2000 servers but
nothing changed.

Here are two of our users, user A is from a NT4 PC and user B from a XP PC:
VMS> show user /full

A BDE04 A 2B64DCE9 TNA9622: (Host: mrsstwsn5266 Port: 3431)
B BDE05 _TNA919: 2B4C15DA TNA919: (Host: mrsstwsn00164 Port: 2299)

Now the strange things:
1)
The name of the PC from user A is PC5331 and not MRSSTWSN5266.
The IP-Adress of PC5331 is 10.112.70.19

NSLOOKUP> 10.112.70.19
Name: mrsstwsn0068
Address: 10.112.70.19

NSLOOKUP> MRSSTWSN0068
Name: mrsstwsn0068.STO.MODOPAPER.COM
Address: 10.112.68.115

NSLOOKUP> MRSSTWSN5266
Name: mrsstwsn5266.STO.MODOPAPER.COM
Address: 10.112.68.151

2)
The name of the PC from user B is MRSSTWSN00129 and not MRSSTWSN00164
The IP-Adress of MRSSTWSN00129 ist 10.112.68.29

NSLOOKUP> MRSSTWSN00129
Name: mrsstwsn00129.STO.MODOPAPER.COM
Address: 10.112.68.29

NSLOOKUP> MRSSTWSN00164
*** mrsstser0015.sto.modopaper.com can't find mrsstwsn00164: Server failed

The ping for mrsstwsn00164 fails,too. The PC seems to be not reachable.

We have the same problem with more of our PCs. Sometime you can see names that don't exist, sometimes you see names of other PCs.
We've looked in our DNS but we can't find the error. The PC5331 can only be found in the DHCP database, the PC00129 can be found in the DNS database.

How can I see the right names?

Re: Problems with Tcpip and names

Ian Miller. — Thu, 15 Jul 2004 10:19:44 GMT

it looks like the inverse lookup (ip addr to name) is not inline with the normal lookup (n ame to addr). These are/can be seperate databases. How are the DNS databases updated?

Re: Problems with Tcpip and names

Antoniov. — Thu, 15 Jul 2004 12:12:57 GMT

Hi,
if you have 3 DNS server what order are record in vms name service?
You posted:

NSLOOKUP> 10.112.70.19
Name: mrsstwsn0068
Address: 10.112.70.19

Before this you could see the DNS server answer you: in that DNS server may be 10.112.70.19 is mrsstwsn0068.
When you try reverse resolving, as Ian posted you access to a different database and also setting name you cold inquire about virtual host.
Look for this real example (web site of my business):
NSLOOKUP>shs-av.it
Non-authoritative answer:
Name: shs-av.it
Address: 193.207.40.49

> 193.207.40.49
Name: explorer.anstal.it
Address: 193.207.40.49

Antonio Vigliotti

Re: Problems with Tcpip and names

Kirsten Knüttel — Fri, 16 Jul 2004 00:33:21 GMT

Hello,

in both directions it is the same name server that answers (both times the openVMS server).

But we've found a solution for our problem (we needed the IP-Adresses of the users who are logged in), I've switched off that the IP-Adresses are translated into names:

TCPIP> set service telnet /log=addr

Now I only see the IP-Adresses and these are the right ones.

So many thanks to all who tried to help me (perhaps we can find the reason for our problems in the future).

Kind regards,

Kirsten