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trace
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1994-08-09
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trace [<iface> [off | <btio>]
Controls packet tracing by the interface drivers. Specific bits
enable tracing of the various interfaces and the amount of
information produced. Tracing is controlled on a per-interface basis;
without arguments, 'trace' gives a list of all defined interfaces and
their tracing status. Output can be limited to a single interface by
specifying it, and the control flags can be change by specifying them
as well.
The flags are given as a hexadecimal number which is interpreted
as follows:
B - Broadcast filter flag. If set, only packets specifically
addressed to this node will be traced; broadcast packets will
not be displayed.
T - Controls type of tracing:
0 - Protocol headers are decoded, but data is not displayed
1 - Protocol headers are decoded, and data (but not the headers
themselves) are displayed as ASCII characters, 64 characters/line.
Unprintable characters are displayed as periods.
2 - Protocol headers are decoded, and the entire packet (headers AND
data) is also displayed in hexadecimal and ASCII, 16 characters per
line.
I - Enable tracing of input packets if 1, disable if 0
O - Enable tracing of output packets if 1, disable if 0
Example: # Trace all incoming packets on port1 and display with
# headers
trace port1 0111