Linux Basic Web Tools learning notes

1.ifconfig Interface Up/down/mtu/netmask/broadcast

Ifconfig eth0 192.168.1.1 #不加参数, automatically add masks by standard A/B/C class

Ifconfig eth0 192.168.100.100 netmask 255.255.252.0 MTU 8000

Ifconfig eth0:0 192.168.100.101 #给一张网卡添加多个ip

Ifconfig settings expire after restarting the network service

Ifconfig wl0 up #启动无线网卡 without configuring any parameters

2. Ifup/ifdown using the/etc/sysconfig/network-scripts/ifcfg-eth* configuration to enable the NIC

3.route

Router Add/del–net/host netmask Gw/dev

Route add–net 192.168.100.0 netmask 255.255.255.0 Dev eth0

Route add default GW 192.168.1.254

Route del–net 169.254.0.0 netmask 255.255.0.0 Dev eth0

4.ip

IP link show/set device up/down/address/name/mtu

IP link set eth0 down

IP link set eth0 MTU 1000

IP link Set eth0 name Virbird address Aa:aa:aa:aa:aa:aa

IP address add/del IP dev broadcast/label/scope (global,site,link,host)

IP address add 192.168.1.2/24 broadcast + dev eth0 label Eth0:vbird

IP addresss del 192.168.1.2/24 dev eth0

IP route

IP route Add/del ip/network via Gateway/dev MTU

IP route add 192.168.5.0/24 dev eth0

IP route add 192.168.10.0/24 via 192.168.5.100 Dev eth0

IP route add default via 192.168.1.254 dev eth0

IP route Delete 192.168.10.0/24

5 dhclient IP Request via DHCP

6 Ping

Ping–c2–s 8000–m do 192.168.1.254 #发大包并且不允许交换机或路由器将封包重组

IP header 20bytes,icmp20bytes, ETHERNET Baotou 1500

7netstat

-N uses a number instead of a host name

-A lists all online statuses, including the Tcp/udp/unix socket

-T only TCP packets

-U UDP packets only

-L All in the listening service

-p list PID and program file name

-C refresh every few seconds

View network services that are currently started

Netstat–tulnp

View all network online status for this computer

The netstat–atunp# client randomly takes more than 1024 ports, and only root can start ports below 1024.

8 nslookup

-query=type

9 wget

Vim/etc/wgetrc

Http_proxy =

Ftp_proxy =

Use_proxy= on

Ten tcpdump

-A ASCII format to display packet contents

-E is displayed in two-layer packet format

-NN Digital Display Host

-x 16 in binary form

-I listener Port

-W Output listening content

Tcpdump–i Eth0–nn Port 21

Linux Basic Web Tools learning notes