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View All Network Setting

The “ifconfig” command with no arguments will display all the active interfaces details. Theifconfig command also used to check the assigned IP address of an server. [root@tecmint ~]# ifconfig eth0 Link encap:Ethernet HWaddr 00:0B:CD:1C:18:5A inet addr:172.16.25.126 Bcast:172.16.25.63 Mask:255.255.255.224 inet6 addr: fe80::20b:cdff:fe1c:185a/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2341604 errors:0 dropped:0 overruns:0 frame:0 TX packets:2217673  Full Article…

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Display Information of All Network Interfaces

The following ifconfig command with -a argument will display information of all active or inactive network interfaces on server. It displays the results for eth0, lo, sit0 and tun0. [root@tecmint ~]# ifconfig -a eth0 Link encap:Ethernet HWaddr 00:0B:CD:1C:18:5A inet addr:172.16.25.126 Bcast:172.16.25.63 Mask:255.255.255.224 inet6 addr: fe80::20b:cdff:fe1c:185a/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2344927 errors:0 dropped:0 overruns:0 frame:0 TX packets:2220777 errors:0 dropped:0 overruns:0 carrier:0  Full Article…

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View Network Settings of Specific Interface

Using interface name (eth0) as an argument with “ifconfig” command will display details of specific network interface. [root@tecmint ~]# ifconfig eth0 eth0 Link encap:Ethernet HWaddr 00:0B:CD:1C:18:5A inet addr:172.16.25.126 Bcast:172.16.25.63 Mask:255.255.255.224 inet6 addr: fe80::20b:cdff:fe1c:185a/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2345583 errors:0 dropped:0 overruns:0 frame:0 TX packets:2221421 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX  Full Article…

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How to Enable an Network Interface

The “up” or “ifup” flag with interface name (eth0) activates an network interface, if it is not in active state and allowing to send and receive information. For example, “ifconfig eth0 up” or “ifup eth0” will activate the eth0 interface. [root@tecmint ~]# ifconfig eth0 up OR [root@tecmint ~]# ifup eth0

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How to Disable an Network Interface

The “down” or “ifdown” flag with interface name (eth0) deactivates the specified network interface. For example, “ifconfig eth0 down” or “ifdown eth0” command deactivates theeth0 interface, if it is in active state. [root@tecmint ~]# ifconfig eth0 down OR [root@tecmint ~]# ifdown eth0

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How to Assign a IP Address to Network Interface

To assign an IP address to an specific interface, use the following command with an interface name (eth0) and ip address that you want to set. For example, “ifconfig eth0 172.16.25.125” will set the IP address to interface eth0. [root@tecmint ~]# ifconfig eth0 172.16.25.125

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How to Assign a Netmask to Network Interface

Using the “ifconfig” command with “netmask” argument and interface name as (eth0) allows you to define an netmask to an given interface. For example, “ifconfig eth0 netmask 255.255.255.224” will set the network mask to an given interface eth0. [root@tecmint ~]# ifconfig eth0 netmask 255.255.255.224

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How to Assign a Broadcast to Network Interface

Using the “broadcast” argument with an interface name will set the broadcast address for the given interface. For example, “ifconfig eth0 broadcast 172.16.25.63” command sets the broadcast address to an interface eth0. [root@tecmint ~]# ifconfig eth0 broadcast 172.16.25.63

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How to Change MTU for an Network Interface

The “mtu” argument set the maximum transmission unit to an interface. The MTU allows you to set the limit size of packets that are transmitted on an interface. The MTU able to handle maximum number of octets to an interface in one single transaction. For example, “ifconfig eth0 mtu 1000” will set the maximum transmission unit to given set  Full Article…

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How to Enable Promiscuous Mode

What happens in normal mode, when a packet received by a network card, it verifies that the packet belongs to itself. If not, it drops the packet normally, but in the promiscuous mode is used to accept all the packets that flows through the network card. Most of the today’s network tools uses the promiscuous  Full Article…

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How to Disable Promiscuous Mode

To disable promiscuous mode, use the “-promisc” switch that drops back the network interface in normal mode. [root@tecmint ~]# ifconfig eth0 -promisc

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How to Add New Alias to Network Interface

The ifconfig utility allows you to configure additional network interfaces using alias feature. To add alias network interface of eth0, use the following command. Please note that alias network address in same sub-net mask. For example, if your eth0 network ip address is172.16.25.125, then alias ip address must be 172.16.25.127. [root@tecmint ~]# ifconfig eth0:0 172.16.25.127 Next, verify the newly created alias network interface  Full Article…

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How to Remove Alias to Network Interface

If you no longer required an alias network interface or you incorrectly configured it, you can remove it by using the following command. [root@tecmint ~]# ifconfig eth0:0 down

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How to Change the MAC address of Network Interface

To change the MAC (Media Access Control) address of an eth0 network interface, use the following command with argument “hw ether“. For example, see below. [root@tecmint ~]# ifconfig eth0 hw ether AA:BB:CC:DD:EE:FF These are the most useful commands for configuring network interfaces in Linux, for more information and usage of ifconfig command use the manpages like “man ifconfig” at the terminal. Check  Full Article…

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ifconfig

ifconfig – configure a network interface ifconfig [interface] ifconfig interface [aftype] options | address …   For local network:  ifconfig interface up address netmask mask   Ifconfig is used to configure the kernel-resident network interfaces. It is used at boot time to set up interfaces as necessary. After that, it is usually only needed when debugging  Full Article…

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