IP configuration:
GUI tool-
#system-config-network
CLI Tool-
#vi /etc/sysconfig/network-scripts/ifcfg-ethx
#setup
Device Activation:
#/etc/init.d/NetworkManager restart
#service network restart
#service network stop
#service network start
DNS configuration:
#vi /etc/resolve.conf
Default gateway:
#setup
#system-config-network
#vi /etc/sysconfig/network-scripts/ifcfg-ethx
Managing Ethernet Connections:
Network interface are named sequentially:
eth0, eth1, etc. view interface configuration with ifconfig eth0
#ifconfig eth0 enable interface with ifup eth0
#ifup eth0 disable interface with ifdown eth0
#ifdown eth0
other globle network setting :
if you want to modify your host name and gateway address manually.
temporary basis:
#hostname name
permanent basic:
#vi /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=server1.redhat.com
GATEWAY=192.168.1.1
save and exit
#service network restart
DNS Configuration:
1.domain name service translates hostname to network addresses
2. server address is specified by DHCP or /in /etc/resolve.conf
#service network restart
Local name resolve configuration file
#vim /etc/hosts
IP address hostname alias
Reference “man hosts”
# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.1.100 server1.example.com server1
Check the port number and routing command
route
traceroute
netstat
r display the routing rable
i display interface statistics
t shows tcp connection
u shows udp connection
a display all sockets (tcp,udp or local)
p display process IDs
e display extended information
l listening
n numerical
# hostname
server1.example.com
# hostname d
example.com
# hostname s
server1
# hostname a
server1
# hostname f
server1.example.com
# hostname i
192.168.1.100
# hostname y
# iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
pan0 no wireless extensions.
# ethtool eth0
Settings for eth0:
Supported ports: [ T P ]
Supported link modes: 10baseT /Half 10baseT /Full
100baseT /Half 100baseT /Full
1000baseT /Full
Supports autonegotiation: Yes
Advertised link modes: 10baseT /Half 10baseT /Full
100baseT /Half 100baseT /Full
1000baseT /Full
Advertised pause frame use: No
Advertised autonegotiation: Yes
Speed: 1000Mb/s
Duplex: Full
P ort: T wisted P air
P HYAD: 0
T ransceiver: internal
Autonegotiation: on
MDIX: Unknown
Supports Wakeon: d
Wakeon: d
Current message level: 0x00000007 (7)
Link detected: yes
# ethtool i eth0
driver: e1000
version: 7.3.21k61NAPI
firmwareversion: N/A
businfo: 0000:02:01.0
ethtool –s eth0 speed 100 autoneg off
ethtool –S eth0
# miitool eth0
eth0: negotiated 100baseTxFD, link ok
# host 192.168.1.100
100.1.168.192.inaddr.arpa domain name pointer server1.example.com.
# host server1.example.com
server1.example.com has address 192.168.1.100
# nslookup server1.example.com
Server: 192.168.1.100
Address: 192.168.1.100#53
Name: server1.example.com
Address: 192.168.1.100
# nslookup 192.168.1.100
Server: 192.168.1.100
Address: 192.168.1.100#53
100.1.168.192.inaddr.arpa name = server1.example.com.
[root@server1 Desktop]# dig server1.example.com
; <<>> DiG 9.7.3P 3RedHat9.7.38.P 3.el6 <<>> server1.example.com
;; global options: +cmd
;; Got answer:
;; >>HEADER<< 11399="" id:="" noerror="" opcode:="" query="" span="" status:="">
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUT HORIT Y: 1, ADDIT IONAL: 0
;; QUEST ION SECT ION:
;server1.example.com. IN A
;; ANSWER SECT ION:
server1.example.com. 86400 IN A 192.168.1.100
;; AUT HORIT Y SECT ION:
example.com. 86400 IN NS server1.example.com.
;; Query time: 0 msec
;; SERVER: 192.168.1.100#53(192.168.1.100)
;; WHEN: Sun Dec 2 21:56:55 2012
;; MSG SIZE rcvd: 67
# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.0 U 1 0 0 eth0
default 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
# netstat r
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
default 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
# netstat tulnp | grep 22
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 2184/sshd
tcp 0 0 :::22 :::* LISTEN 2184/sshd
# nmap sTU p 21 192.168.1.100
Starting Nmap 5.21 ( http://nmap.org ) at 20121202 22:05 IST
Nmap scan report for server1.example.com (192.168.1.100)
Host is up (0.00020s latency).
PORT STATE SERVICE
21/tcp open ftp
21/udp closed ftp
Nmap done: 1 IP address (1 host up) scanned in 0.03 seconds
# nmap sTU p 22 192.168.1.100
Starting Nmap 5.21 ( http://nmap.org ) at 20121202 22:05 IST
Nmap scan report for server1.example.com (192.168.1.100)
Host is up (0.00042s latency).
PORT STATE SERVICE
22/tcp open ssh
22/udp closed ssh
Nmap done: 1 IP address (1 host up) scanned in 0.03 seconds
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