The MMP Uses SO_LINGER To Cause TCP Rst, Runs Afoul Of Solaris Rst Rate Limit
Last updated on APRIL 25, 2018
Applies to:Oracle Communications Messaging Server - Version 8.0.2 and later
Information in this document applies to any platform.
Using: Oracle Communications Messaging Server 22.214.171.124.20180130
Running into the default for these Solaris ndd parameters:
tcp_rst_sent_rate_enabled = 1
tcp_rst_sent_rate = 40
You can see how many TCP Rst are NOT sent because of that rate limit by doing:
kstat -p tcp:0:tcpstat:tcp_rst_unsent
Looking at snoop, the Rst packets seem to be going to port 993 on the backends.
If we have a high enough rate of connections between the MMP and the backends, and if the MMP normally sets SO_LINGER such that connections are closed with Rst, it could be a normal connection rate is running afoul of the default for that ndd limit.
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