Modbus TCP

rongolsen · ‎05-29-2007

Are there special software tools \hardware that can detect and route ModbusTCP packets more efficiant?

wong34539 · ‎06-04-2007

Modbus/TCP is an open automation protocol used in a variety of SCADA, PLC, and industrial IO applications. Modbusfw is a Linux 2.4.x Netfilter Extension that permits filtering decisions (DROP, REJECT, etc.) based on application-layer values, allowing finer-grained access control than is currently possible by simply blocking TCP port 502

http://modbusfw.sourceforge.net/

andrew.burns · ‎06-05-2007

You might want to look at implementing some kind of QoS, marking modbus packets on entry to the network and prioritising them as they pass through.

Here's a link to some white papers which should give you some ideas:

http://www.cisco.com/en/US/products/ps6558/prod_white_papers_list.html

HTH

Andrew.