Ifconfig-route-netstat

Ifconfig command

Ifconfig-a

Ifconfig eth0 [Up|down]

Ifconfig eth0 172.16.6.14/16 [up]

Ifconfig eth0 172.16.6.14/16 (16 subnet mask length)

Ifconfig eth0 172.16.6.14 netmask 255.255.0.0

Note: effective immediately.

Enable promiscuous mode: [-]promisc

Route command

Routing Management Commands

View Route-n

Adding a route add

Route add-host 192.168.1.44 GW 172.16.6.1 Dev eth0 (destination host routing)

Route add-net 192.168.0.0 netmask 255.255.255.0 gw 172.16.6.1 Dev eth0

Default route, Gateway:

Route add-net 0.0.0.0 netmask 0.0.0.0 GW 172.16.6.1

Route add default GW 172.16.6.1

Route Del-host 192.168.1.44

Route del-net 192.168.0.0 netmask 255.255.255.0

DNS server Specifies

/etc/resolv.cnfg

NameServer DNS_IP1

NameServer DNS_IP2

NameServer DNS_IP3

Positive solution: Fqdn-->ip

Dig-t A FQDN

Host-t A FQDN

Inverse solution: Ip-->fqdn

Dig-x IP

Host-x IP

Netstat: Network Status View command

Netstat-print network connections, routing tables, interface statis-

Tics, masquerade connections, and multicast memberships

Show Network Connections:

Netstat-t

Netstat-tn

Netstat-atn

-t:tcp

-u:udp

-r:raw socket

-L: Monitor

-A: all States

-N: Displayed in numeric format, not reversed

-e: Extended format information

-P: Show dependent process PID

Common combinations:

-TAN,-UAN,-TNL,-UNL

Show route Table

Netstat-rn

Display interface Statistics

Netstat-i

Netstat-ieth0

Ifconfig-route-netstat