Load Distribution to Multiple Servers via Direct Links

Load Distribution
Platform
Napatech SmartNIC
Content Type
User Guide
Capture Software Version
Link™ Capture Software 12.8

Filter-based local retransmission

It is possible to locally retransmit frames on multiple ports while delivering the same frames to the host as illustrated in the figure.


local_retransmit_example Sheet.3 Sheet.4 Capture/Write to disk Capture/Write to disk Sheet.8 E-mail traffic real-time analysis E-mail traffic real-time analysis Sheet.16 Web traffic real-time analysis Web traffic real-time analysis Sheet.22 Remaining traffic monitoring Remaining traffic monitoring

This NTPL example configures filters to retransmit SMTP traffic on one port, HTTP traffic on another and the rest of the traffic on a third port, while everything is captured and delivered to stream 0.
Define mTcpSrcPort = \\
Macro("Data[DynOffset=DynOffTcpFrame;Offset=0;DataType=ByteStr2;DataMask=[15:0]]")
Define mTcpPort_HTTP = Macro("80")
Define mTcpPort_SMTP = Macro("25")

Assign[StreamId=0] = Port==0 # Capture all
Assign[Priority=0; DestinationPort=1] = (mTcpSrcPort == mTcpPort_SMTP AND Port==0 AND \\
Truncated==False)
Assign[Priority=0; DestinationPort=2] = (mTcpSrcPort == mTcpPort_HTTP AND Port==0 AND \\
Truncated==False)
Assign[Priority=10;DestinationPort=3] = Port==0 # The remaining traffic