Difference between revisions of "Network Setup Tips"
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Revision as of 16:28, 9 November 2011
Contents
Accessing Network Configuration Files
To easily access the network configuration files, simply use the cdnet command:
[root@probe network-scripts]#
/etc/sysconfig/network-scripts [root@probe network-scripts]#
How To Add A Host Name Identifier To A DHCP Server
Some times it is desirable to add a host name identifier at the DHCP Client to be recognized by the DHCP Server. This will allow for local host names to be resolved by their respective name on the local LAN. This works well with a DD-WRT enabled LinkSys router and bind.
To do this, add the following line to your network configuration file (Example for: eth0 - We will use file: "/etc/sysconfig/network-scripts/ifcfg-eth0" and request that the DHCP server set this system's host name to: "emachine".):
DHCP_HOSTNAME=<your desired host name for this NST DHCP client>
Both the "network" service and the NetworkManager service support this setting for DHCP.
DEVICE=eth0 BOOTPROTO=dhcp ONBOOT=yes DHCP_HOSTNAME=emachine
How To Permanently Set The Host Name Of Your System
To do this, add/change the following line to the system configuration file: "/etc/sysconfig/network"
HOSTNAME=<your desired host name for this NST system>
NetworkManager will be notified of this change and automatically set the system "hostname". The example below sets the system host name to: "emachine". Typically, if this system is a DHCP client, both the "DHCP_HOSTNAME" discussed above and the "HOSTNAME" entries are set identically.
NETWORKING=yes HOSTNAME=emachine NOZEROCONF=yes
A system reboot can be done to verify all changes.
Configuring A Static IP Address
If the network your interface is connected to does not have a DHCP server, you will need to configure your system to use a static IP address. The following shows the contents of: "/etc/sysconfig/network-scripts/ifcfg-eth0" which is used to assign a static IP address of 192.168.12.100 to eth0 (an Ethernet interface):
DEVICE=eth0 BOOTPROTO=static IPADDR=192.168.12.100 NETMASK=255.255.255.0 NETWORK=192.168.12.0 BROADCAST=192.168.12.255 GATEWAY=192.168.12.1 ONBOOT=yes
NOTE: The above assumes that the gateway machine for the network has an IP address of: "192.168.12.1".
Configuring A Stealth Network Interface
In order to configure a stealth (i.e., A network interface with a non-binding IP Address) network interface set the BOOTPROTO setting to: "none". Example: Make network interface: "eth1" at stealth interface using this minimal configuration:
DEVICE=eth1 BOOTPROTO=none ONBOOT=yes
Restarting the Network Service
After editing any network configuration file, you should restart the network service as shown below:
[root@tmobile network-scripts]# service network restart Shutting down interface eth0: [ OK ] Shutting down loopback interface: [ OK ] Bringing up loopback interface: [ OK ] Bringing up interface eth0: [ OK ]
Display Routing Table
The following command can be used to display your network routing table (the -n option was included to prevent the route command from trying to resolve names):
Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
