SYNOPSIS
fgadm [ check | reload | save | stop ]
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.
AUTHOR
fgadm was written by Jamie Wilkinson <[email protected]> for the filtergen package, to ease maintenance of filtergen-based firewalls.