[Info-vax] strange LAT problem

[Jan-Erik Söderholm]

Den 2018-12-03 kl. 14:19, skrev Bob Koehler:
> In article <pu0os2$tgf$1 at gioia.aioe.org>, helbig at asclothestro.multivax.de (Phillip Helbig (undress to reply)) writes:
>> In article <pu0igt$54o$1 at Iltempo.Update.UU.SE>, Johnny Billquist
>> <bqt at softjar.se> writes:
>>
>>> On 2018-11-28 21:52, Phillip Helbig (undress to reply) wrote:
>>>> In article <ptls10$hsa$2 at Iltempo.Update.UU.SE>, Johnny Billquist
>>>> <bqt at softjar.se> writes:
>>>>
>>>>> Any WiFi in this picture?
>>>>
>>>> No.  There is WiFi on the same LAN, but nothing to do with VMS.
>>>
>>> Meaning you use LAT between VMS hosts, and all the VMS hosts are sitting
>>> on the same ethernet segment with nothing else in between?
>>
>> Right; just a switch.
> 
>     LAT is extreemly sensitive to timing, and it's possible that the
>     switch does not meet the needs of LAT.  We've seen network bridges
>     that required special firmware to hande LAT.  (Not routers, LAT is
>     not a routable protocol, one can expect it to stop at a router.)
> 

LAT worked on 30 year old 10 Mb switches. I would be very surpriced if
there are timing ("too slow") issues with modern 100Mb or Gb switches.
Even the very cheapest ones...

This whole thing is probably some simple issue in one or more
of the affected systems.