Linux网络安全技巧(2)

echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_all

telnet stream tcp nowait root /usr/sbin/tcpd in.telnetd -h

# Lookup names via DNS first then fall back to /etc/hosts.
order bind,hosts
# We don have machines with multiple IP addresses on the same card
(like virtual server,IP Aliasing).
multi off
# Check for IP address spoofing.
nospoof on
IP Spoofing: IP-Spoofing is a security exploit that works by tricking
computers in a trust relationship that you are someone that you really aren .

tty1
#tty2
#tty3
#tty4
#tty5
#tty6
#tty7
#tty8