what is a filter ? WExplain any five filters in unix Post: 302191226

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LEARN ABOUT DEBIAN

fgadm

FGADM(8)						      System Manager's Manual							  FGADM(8)

NAME

       fgadm - filtergen command program

SYNOPSIS

       fgadm [ check | reload | save | stop ]

DESCRIPTION

       fgadm is a simple command interface for managing filtergen(8) based packet filters.

USAGE

       fgadm  can  be  used  to  stop  existing  filters  (thus  turning  them off), reload new packet filters, save currently running filters for
       longevity, and to check filter scripts for errors before reloading.

       The following commands are accepted by fgadm:

       check  Check the filter script /etc/filtergen/rules.filter for errors.  The generated filter will be printed on standard output, and errors
	      printed to standard error.

       reload Replace  the  current  live  packet filter with the one in /etc/filtergen/rules.filter.  The script will be tested for errors before
	      reloading.

       save   The current live packet filter will be saved in a distribution-friendly way.  On Red Hat systems, this will  save  the  iptables	or
	      ipchains firewall that is currently loaded into the kernel to load at boot with the iptables or ipchains initscript.

       stop   This  command  will  flush  the  current	live packet filter out and put it in a default accept mode, thus no firewalling will be in
	      place.  This is useful to abort firewalls in an emergency.

EXAMPLES

       One may find the following sequence of commands useful for making firewall changes on live servers:

       # at now + 2 min
       warning: commands will be executed using (in order) a) $SHELL b) login shell c) /bin/sh
       at> fgadm stop
       at> ^D<EOT>
       job 53 at 2004-06-07 17:25
       # fgadm check
       # fgadm reload
       # atq
       53
       # atrm 53
       # fgadm save

FILES

   /etc/filtergen/rules.filter
       Packet filter descriptions are read from this file when fgadm is used.

   /etc/filtergen/fgadm.conf
       This file alters the behaviour of filtergen as called from fgadm.

BUGS

       fgadm save does not work on Debian systems with iptables due to a lack of common sense in the iptables package.

SEE ALSO

       filtergen(8), filter_syntax(5), filter_backends(5)

AUTHOR

       fgadm was written by Jamie Wilkinson <jaq@spacepants.org> for the filtergen package, to ease maintenance of filtergen-based firewalls.

								   June 7, 2004 							  FGADM(8)