[Demosfen.Spb]

# Define variables
IPT=/usr/sbin/iptables # change if needed
EXT_IF=eth0 # external interface (connected to internet)

# Enable TCP SYN Cookie Protection
if [ -e /proc/sys/net/ipv4/tcp_syncookies ]; then
echo 1 > /proc/sys/net/ipv4/tcp_syncookies
fi

# Disable ICMP Redirect Acceptance
echo 0 > /proc/sys/net/ipv4/conf/all/accept_redirects

# Do not send Redirect Messages
echo 0 > /proc/sys/net/ipv4/conf/all/send_redirects

# Enable bad error message protection
echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses

# Enable broadcast echo protection
echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

# Disable source-routed packets
echo 0 > /proc/sys/net/ipv4/conf/all/accept_source_route

# Set default policy to DROP
$IPT -P INPUT DROP
$IPT -P OUTPUT DROP
$IPT -P FORWARD DROP

# Flush old rules
$IPT -F

# Allow loopback traffic
$IPT -A INPUT -i lo -j ACCEPT
$IPT -A OUTPUT -o lo -j ACCEPT

# Allow packets of established connections and those
# which are related to established connections
$IPT -A INPUT -i $EXT_IF -p all -m state --state ESTABLISHED,RELATED -j ACCEPT

# Allow all outgoing packets
$IPT -A OUTPUT -o $EXT_IF -j ACCEPT

# Allow incoming ssh from internet (uncomment the line below if needed)
#$IPT -A INPUT -i $EXT_IF -p tcp --destination-port 22 --syn -m state --state NEW -j ACCEPT

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Create rc.firewall in da /etc/rc.d/ and make it executable by "chmod a+x" command
Good luck! Wenda must die!

@темы: Slackware