During firewall kernel debug with fw ctl zdebug you received less information that expected. You noticed that a lot of messages were lost since the time the debug was started. What should you do to resolve this issue?
A.
Increase debug buffer; Use fw ctl debug -buf 32768
B.
Redirect debug output to file; Use fw ctl debug-o ./debug.elg
C.
Redirect debug output to file; Use fw ctl zdebug -o ./debug.elg
D.
Increase debug buffer; Use fw ctl zdebug -buf 32768
The correct answer is:
A. Increase debug buffer; Use fw ctl debug -buf 32768
- The "fw ctl zdebug" command is a shorthand for quickly enabling kernel debug flags and outputs directly to the console, but it uses a small buffer (by default, 1MB). If you are losing messages, it is likely because the buffer is too small and overflows.
- To resolve this, you should increase the kernel debug buffer size before starting the debug. The correct command to do this is:
fw ctl debug -buf 32768
This sets the buffer size to 32MB, which helps prevent message loss during high-volume debugging.
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