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System: Linux bareserver 4.15.0-213-generic #224-Ubuntu SMP Mon Jun 19 13:30:12 UTC 2023 x86_64
User: root (0)
PHP: 7.2.24-0ubuntu0.18.04.17
Disabled: pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,
$ pwd: /usr/share/doc/iptables/
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File: //usr/share/doc/iptables/INCOMPATIBILITIES
INCOMPATIBILITIES:

- The REJECT target has an '--reject-with admin-prohib' option which used
  with kernels that do not support it, will result in a plain DROP instead
  of REJECT.  Use with caution.
  Kernels that do support it:
  	2.4 - since 2.4.22-pre9
	2.6 - all

- There are some issues related to upgrading from 1.2.x to 1.3.x on a system
  with dynamic ruleset changes during runtime. (Please see 
  https://bugzilla.netfilter.org/bugzilla/show_bug.cgi?id=334).
  After upgrading from 1.2 to 1.3, it suggest go do an iptables-save, then
  iptables-restore to ensure your dynamic rule changes continue to work.
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