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4-8
Surveyor
User’s Guide
Module settings are described in the subsections below. Default values for Module
Settings are shown in Table 4-4:
Buffer Size
Portable Surveyor 10/100 Ethernet Analyzer Card and NDIS cards require that a
capture buffer size be set. The buffer size is the amount of system memory that will
be used to save captured data. Buffer sizes can be set between 64KB and 16MB.
THGm modules have a hardware buffer and do not require system memory for
captured data. The default buffer size is 512KB.
Packet Slice (Slicing Size)
All devices support packet slicing. Packet slicing means that a subset of the entire
packet is saved in the capture buffer. You can save the first 32 bytes (Mac layer), the
first 64 bytes (Network layer), the first 112 or 128 bytes (Application layer), or the
full length of the packet.
Packet slicing can be set separately for monitor and capture except for THGm. For
monitor, packet slicing can improve performance when monitoring the entire packet
contents is not required. For capture, packet slicing can save space in the capture
buffer for more packets when analysis of the entire contents of each packet is not
required.
Table 4-4. Default Module Settings
Module Setting Default Values
Buffer Size 512K
Packet Slicing Size, Capture Full packet length
Packet Slicing Size, Monitor Full packet length (for THGm), 128 bytes (for standard NDIS
modules)
Enable Full Buffer Auto Save Not selected
Expert Symptoms All symptoms enabled except TCP checksum errors
Modes: Expert Analysis Mode Selected (Expert plug-in only)
Modes: Non-WKP Mode Not selected
Modes: Multi-QoS Only Not selected (Multi-QoS plug-in only)
Expert Threshold Each threshold has its own default value
MAC Control Frame Selected for THGm, not supported by others