Re: Networking after 7.5

Gibbs Rule 39 applies, however also FrankenRule 04h also applies. (https://www.frankeni.com/FrankenRules.html#04h)

Do you see the SYN ACK departing IBM i? In other words it matters where to do the Wireshark trace from. If it's STRCMNTRC that's cool and it can create pcap files for wireshark but that just says that IBM i created it, not that it got to your switch, let alone to your device.

If the wireshark trace is run on the machine with ACS on it that's absolutely the end of the line so if it is seen at the switch, it is getting lost 'somewhere in the middle'.

FYI We have a number of i7.5 partitions running and have experienced no issues.

- DrF

On 12/1/2022 11:00 AM, Justin Taylor wrote:

I upgraded from 7.3 to 7.5 over the long holiday weekend while the rest of
the company was enjoying Thanksgiving. The upgrade completed without
issue, but I immediately began experiencing network slow-downs and
time-outs. I don't think I've had an ACS Verify Connection complete
successfully. Only IBMi is having an issue.

IBM support insists this isn't IBMi related, and it's just a coincidence
that it occurred with the 7.5 upgrade. Does anyone have any suggestions on
how I can troubleshoot this?

Here's what IBM support said based on packet traces:
"The IBM i is responding to the SYN with a SYN ACK but the Wireshark trace
doesn't show that the SYN ACKs are being received."

TIA