Software architect (American Express)
TCS of America
Part of system support for American Express Credit Auth System involving the communications area for SNA and conversion to TCP/IP and implementing MQ, internet TCP daemon server. Middleware development was in C/C++ for TCP and MQ.
Defined IP rules config file to restrict port access, network services DB for QOS, rate of traffic flow, Syslog daemon config file for message logging of low resource messages from applications and Internet daemon config file using SED and RE for altering services config files.
Rexx front end for parameter selection for IP trace, PIU trace and development of Window C#.NET, Java, unmanaged C/C++ tools to reproduce test and prod issues.
“Proof of concept” for legacy change to TCP/IP using MQ and IP bridge.
“Proof of concept” for MQ client, services such as SNMP, monitoring tools on Windows MRTG.
Implementing MQSeries using MQ formats MQSRT, MQIIH and MQXMIT.
Conversion of auth traffic from SNA to TCP/IP implementing daemon model used non-blocking I/O and asynchronous I/O server, TPF API TCP complete read.
Network analysis on daemon server, MQSeries using traces, reproducing by having Windows replay messages to TPF using C/C++, C#. Reviewed delayed ACK performance with fixed timer and high message rate and messages are smaller then MTU size. Used windump, Analyzer, Wireshark in support of network troubleshooting.