ifconfig_em0="inet 172.16.1.X/24"
defaultrouter="172.16.1.254"

# Alias example
# ifconfig_em0_alias0="inet 172.16.1.100+X/32"
# ifconfig_em0_alias1="inet 172.16.1.200+X/32"
# ifconfig_em0_alias2="inet 10.5.Z.X/24"

# 802.1q example
# cloned_interfaces="vlan2 vlan3"
# ifconfig_vlan2="inet 172.16.2.X/24 vlan 2 vlandev em0"
# ifconfig_vlan3="inet 172.16.3.X/24 vlan 3 vlandev em0"

[hostX:~] # cat /etc/hosts
…
172.16.1.Y	hostY
172.16.1.254	gate

 
[hostX:~] # cat /etc/resolv.conf 
domain  class.un
nameserver      172.16.1.254

# ifconfig em0 -alias

# ifconfig em0 inet 172.16.1.X/24

# ifconfig em0 inet 10.5.Z.X/24 alias

# /etc/rc.d/netif start

route -n flush

route add default 172.16.1.254

/etc/rc.d/routing start

Команда	        Ключи
arp	        -a -d
ping	        -s размер
netstat 	-rn –f inet –I интерфейс -inb
ifstat	
traceroute	
sockstat	-4
tcpdump	        -i em0 -n -s 0 -X "port 21 and host 172.16.1.X"
nslookup