1

Prepare the kernel debug options.

# fw ctl debug 0

# fw ctl debug -buf 8200

# fw ctl debug -m fw + conn drop vm nat xlate xltrc mgcp sip

# fw ctl debug -m h323 all

# fw ctl debug -m CPAS all

Best practice:

Enable the 'ld' flag in the 'fw' module. This does, however, cause extremely high CPU load.

2

Verify the kernel debug options.

# fw ctl debug -m fw

# fw ctl debug -m h323

# fw ctl debug -m CPAS

3

Start the kernel debug.

# fw ctl kdebug -T -f > /var/log/debug.txt

4

Start the traffic capture in another shell.

# fw monitor -e "host(X.X.X.X), accept;" -o /var/log/fw_mon.cap

5

Replicate the issue.

6

Stop the kernel debug.

Press CTRL+C.

# fw ctl debug 0

7

Stop the traffic capture in another shell.

Press CTRL+C.

8

Collect the debug output files.

/var/log/debug.txt

/var/log/fw_mon.cap