I specified linux world because I have deep administrative experience there. (Also with i, though I've not been blessed with this opportunity on that platform. Also because unix administrators _tend_to_be_ more TCP savvy. I did not mean to imply that this relates only to *ix. Quite the opposite, actually.

Even (gasp!) on mafinframe, this is an issue, because the problem is at the root of all TCP communications, not imbedded in some system's O/S code.

"Vern Hamberg" <vhamberg@xxxxxxxxxxx> wrote:

The trouble with this, Dennis, so far as I can see, is that this box
isn't UNIX - we have never had to think about clearing ARP on this box.

I don't know if there is even a way to do it.

Perhaps that is accomplished by the system when restarting TCPIP -
with some other command.

This system, as you know, is positioned as not needing all that
administrative stuff other OS' do.

So is there a way to clear the ARP? It'd be an interesting thing to


On 4/14/2011 9:13 AM, Dennis wrote:
It is a general rule-of-thumb in the unix world: If you replace a
switch, clear ARP. If you replace a router, clear ARP. Seems to avoid
a wealth of issues.

"Gqcy"<gmufasa01@xxxxxxxxx> wrote:

On 4/14/2011 7:43 AM, Don Cavaiani wrote:
Last night we put in all new switches, and quickly replugged the
Ethernet cable, and the system went on running, telnet for sure.

However, the http servers no longer connected. This morning I
re-started all the HTTP servers, but we were still unable to

I then did an IPL which brought everything back up.

In my experience, _every_time_ we unplug the Ethernet cable, we had
to at a minimum end and restart TCP/IP, and sometimes vary off and
the controller...


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