---- from root's .bash_history ---- ifconfig eth0 nameif kutya 00:50:56:ae:00:09 ifconfig ifconfig eth0 man ifconfig route vi /etc/network/interfaces arpo arp arp -n ssh teacherb arp -n ping teacherb traceroute teacherb traceroute rs1.sze.hu ifconfig ssh whale.hit.bme.hu -l lencse traceroute whale.hit.bme.hu iptables -L ping -c 1 teacherb iptables -A INPUT -p icmp -j drop iptables -A INPUT -p icmp -j DROP iptables -L ping -c 1 teacherb iptables -D INPUT -p icmp -j DROP iptables -A INPUT -s 192.168.100.105 -p icmp -j DROP ping ns.tilb.sze.hu ping teacherb.tilb.sze.hu iptables -D INPUT -s 192.168.100.105 -p icmp -j DROP iptables man iptables cd /proc/sys ls cd net ls cd ipv4 ls ls ip* cat ip_forward vi /etc/sysctl.conf man sysctl.conf vi /etc/sysctl.conf man iptables man iptables