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The issue affected all networking, inbound and outbound. All connections
were slow, and sometimes timed-out.
A TRCCNN showed the SYN ACK leave IBMi, and a Wireshark trace showed it
never arrived at the client.
IBM continues to maintain their innocence, but they had me fix the problem
with an IBMi configuration change. I use VirtualIP for fail-over/load
balancing with two physical ports. My two *DFTROUTE both had a "Duplicate
route priority" of 7, and IBM had me change them both to 5. Presto! I was
back in business. As IBM explained, the 7 meant that a request could come
in on one port but respond on the other port. Changing it to 5 means that
all responses go out on the same port they were received.
I knew that VirtualIP was the old way to do fail-over, and there was newer
way (Link Aggregation). Before this however, I never had a compelling
reason to change. I'll be investigating Link Aggregation when time permits.
Thanks
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