Linux IP address Configuration - ifconfig [relevance: 3.79]

2007-08-31

ifconfig is the linux equivilent of ipconfig and will give you your ipaddress and network details :)

to edit it in red hat go into /etc/sysconfig/network-scripts/ifcfg-eth0 (where 0 is the interface u want to change) and append as desired. then from the command line:

service network [start,stop,restart]

In Ubuntu (Debian)

nano /etc/network/interfaces

Contents should be:

iface eth0 inet static
address 192.168.1.55
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
gateway 192.168.1.1

For DHCP it should read

auto eth0
iface eth0 inet dhcp

To restart your network interface and update settings

sudo /etc/init.d/networking restart

Redhat Linux Network Config [relevance: 2.81]

2007-09-04

Linux Redhat - when the network comes up it will try to execute all of the ifcfg* files in ### etc/sysconfig/network-scripts so create a new file ifcfg-eth01 for arguments sake and add:

### /etc/sysconfig/network-scripts/ifcfg-eth0:1
DEVICE=eth0:1
BOOTPROTO=static
IPADDR=192.168.0.1
NETMASK=255.255.255.0
NETWORK=192.168.0.0
BROADCAST=192.168.0.255
ONBOOT=yes

to add a virtual ip from the command line simply type:

ifconfig eth0:1 192.168.0.1 255.255.255.0

then add:
route add default gw 192.168.0.50 (GATEWAY)
to make make the machine publically visible to through the firewall

Gateway settings

reside in ### /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=myServerBox
GATEWAY=192.168.0.1

DNS settings

reside in /etc/resolv.conf
nameserver 192.168.1.1
nameserver 192.168.1.2

Firewall Settings (IPTables)

reside here:### etc/sysconfig/iptables
# Firewall configuration written by system-config-securitylevel
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:RH-Firewall-1-INPUT - [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A FORWARD -j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
-A RH-Firewall-1-INPUT -p 50 -j ACCEPT
-A RH-Firewall-1-INPUT -p 51 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp --dport 5353 -d 211.1.1.211 -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 8080 -j ACCEPT
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
COMMIT

network config in ubuntu shell:

$ nano /etc/network/interfaces

iface eth0 inet static
address 192.168.1.2
netmask 255.255.255.0
gateway 192.168.1.1
auto eth0

/etc/init.d/networking restart