UCX Communication Error

[Volker Halle]

As you are running DCnet on this LAN interface, you MUST specifiy the DECnet MAC address AA-00-04-00-14-28

When DECnet Phase IV software starts on a LAN interface, it re-programs the MAC address of the LAN interface to use the DECnet MAC address. It is calculated as AA-00-04-00 (fixed prefix) and then the DECnet-address (in your case 10.20) by calculating area*1024 + node-in-area (e.g. 10*1024+20) and swapping the 2 hex bytes.

The interface will then ONLY recognize the newly programmed MAC address.

Volker.

[C Ravi]

I have used the physical DECNet address, but the device still does not ping?

[Volker Halle]

From the VAXstation side, you can only look at the LAN counters. If no packets are being received, either the 'other side' doesn't send them or there is a HW problem in the receiver part of the LAN interface.

If you are programming the 'Highway Data link', is there no way to ping from the 'external device' ?

If UCX SHOW ARP does not show the MAC address of the 'external device' HDL01, the VAXstation has never received an ARP response from that device, so it cannot send an ICMP message to that device.

If you doubt that the LAN interface on the VAXstation does work correctly, it may be possible to test with a loopback connector and some console-level test.

Volker.

[C Ravi]

No there is no way of pinging to the Vaxstation from the Highway Data Link.

Also can you please tell, what type of tests can be performed on the LAN interface on the Vaxstation.

Also can this be a problem with the connection of the BNC Cable.

[Volker Halle]

Yes, it could also be a problem with the transceiver cable and wherever you plug in the other end of the cable.

Here is a pointer to the 'VAXstation 4000 Model 60 Ownerâ s and System Installation
Guide'

http://vt100.net/mirror/mds-199909/cd1/vax/pmarioma.pdf

Chapter 4 describes 'Testing your Ethernet Subsystem'. Note that you may need a AUI loopback connector and a T-Connector with 2 terminators for the ThinWire port.

Volker.

[C Ravi]

Hi volker

Thanks for the document, it was helpful.
It is no pinging to the highway data link device, there was a problem in the position of the network switch and also a terminator had to be attached at the thin wire ethernet end.

Thanks again, i had been stuck with this problem for the past two weeks