This article is for people trying to get their Linux PC connect to internet or just the local network. Most linux distributions come with automatic DHCP clients and thus need minimal tinkering with configuration. But if you are in a situation where having a simple DHCP client is not working, read on. In this part I’ll write about bare basics only.<\/p>\n
First run ifconfig<\/strong> command in console window to check your ip configuration. ifconfg is linux counterpart of Windows ipconfig command. Most likely, the output will look like this:<\/p>\n lo Link encap:Local Loopback Here eth0<\/strong> identifies your LAN interface. If you have more than one, it’s shown as eth1, eth2 and so on. Wirelss interfaces are shown as wlan0, wlan1 and so on.<\/p>\n lo is you default local interface which will always have ip 127.0.0.1<\/p>\n In this case, you can see that eth0 is correctly configured with ip 192.168.1.117 and netmask 255.255.255.0<\/p>\n If you are sure that your network has a DHCP server and want to use only that, run the following command:<\/p>\n \/etc\/init.d\/networking restart<\/strong><\/p>\n Unless you had specified a permanent IP address, the interface on which DHCP client is running will get you an ip like this.<\/p>\n For cases where you don’t have a DHCP server to provide you IP configuration automatically or you just want some other address, say 192.168.1.11 on eth0, type the following command<\/p>\n ifconfig eth0 192.168.1.11 netmask 255.255.255.0<\/strong><\/p>\n This command will assign ip address 192.168.1.11 with netmask 255.255.255.0 to your default network interface eth0. If you want to assign this ip to another ethernet interface, replace eth0 by that interface’s identifier. For example if you want to assign this ip to your 2nd network card, type: Now, that you’ve assigned an ip, it’s time to provide gateway too. If your gateway address in 192.168.1.1, \u00a0type the following command. \u00a0<\/strong>By now, you should be able to connect to your local network. But in order to browse internet, you still need DNS. <\/strong>In Linux, a file named resolv.conf\u00a0<\/strong>stored in \/etc\/<\/strong> contains address of your DNS server. To manually add DNS entries, open resolv.conf in any text editor and add your DNS ip in separate lines. For example:<\/p>\n nameserver 192.168.1.1 Don’t forget to add nameserver<\/strong> before each DNS ip. Save the file and start browsing.<\/p>\n Following above steps will enable you to \u00a0connect to the network for current session. But what if you need to save the settings permanently ? For this you’ll need to edit a file named interfaces.\u00a0<\/strong>It’s path is \/etc\/network\/interfaces\u00a0<\/strong>and it’s contents look like this:<\/p>\n auto lo<\/span> \u00a0<\/span><\/p>\n Here, \u00a0auto eth0 , iface eth0 inet dhcp<\/em><\/span> part shows that DHCP is enabled on eth0 interface.<\/span><\/p>\n iface eth1 inet static<\/span><\/em> <\/em>This part is for eth1 and displays it’s static ip address, netmask and gateway in different lines. If you want any of your interfaces to have a static permanent address, modify entry for that interface \u00a0just like this with address of your choice. In this case, I have 2 network cards and one wireless lan. eth0 \u00a0and wlan get their ip from DHCP while eth1 has a static ip. You can either delete entries of interfaces that you don’t have or just put a #<\/strong> before them to disable them.<\/span> ifconfig eth0 down<\/span><\/p>\n To enable it again type:<\/span><\/p>\n ifconfig eth0 up<\/span>\u00a0<\/span><\/p>\n That’s most of it that’s usually needed in a normal computer. Thanks for reading \u00a0<\/span> <\/em> This article is for people trying to get their Linux PC connect to internet or just the local network. Most linux distributions come with automatic DHCP clients and thus need minimal tinkering with configuration. But if you are in a situation where having a simple DHCP client is not working, read on. In this part…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77,80],"tags":[228,304],"class_list":["post-42","post","type-post","status-publish","format-standard","hentry","category-linux-2","category-tutorial-2","tag-linux","tag-tutorial"],"yoast_head":"\n
\nroot@jj:\/# ifconfig
\neth0 Link encap:Ethernet HWaddr 00:e0:1c:40:07:cf
\ninet addr:192.168.1.117 Bcast:192.168.1.255 Mask:255.255.255.0
\ninet6 addr: fe80::2e0:1cff:fe40:7cf\/64 Scope:Link
\nUP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
\nRX packets:90395 errors:0 dropped:0 overruns:0 frame:0
\nTX packets:68143 errors:0 dropped:0 overruns:0 carrier:0
\ncollisions:0 txqueuelen:1000
\nRX bytes:58988739 (58.9 MB) TX bytes:11107421 (11.1 MB)
\nInterrupt:22 Base address:0x3000<\/span><\/p>\n
\ninet addr:127.0.0.1 Mask:255.0.0.0
\ninet6 addr: ::1\/128 Scope:Host
\nUP LOOPBACK RUNNING MTU:16436 Metric:1
\nRX packets:377 errors:0 dropped:0 overruns:0 frame:0
\nTX packets:377 errors:0 dropped:0 overruns:0 carrier:0
\ncollisions:0 txqueuelen:0
\nRX bytes:41747 (41.7 KB) TX bytes:41747 (41.7 KB)
\n
\n<\/span><\/p>\n
\n
\nifconfig eth1 192.168.1.11 netmask 255.255.255.0<\/strong><\/p>\n
\n
\nroute add default gw 192.168.1.1<\/strong>\u00a0<\/strong><\/p>\n
\nnamserver 4.2.2.2<\/span><\/p>\n
\n<\/span>iface lo inet loopback<\/span>
\n<\/span>
\n<\/span>auto eth0 <\/span>
\n<\/span>iface eth0 inet dhcp<\/span>
\n<\/span>
\n<\/span>
\n<\/span>iface eth1 inet dhcp<\/span>
\n<\/span>address 192.168.1.11<\/span>
\nnetmask 255.255.255.0<\/span>
\n<\/span>gateway 192.168.1.1<\/span>
\n
\n<\/span>#auto eth2<\/span>
\n<\/span>#iface eth2 inet dhcp<\/span>
\n<\/span>
\n<\/span>#auto ath0<\/span>
\n<\/span>#iface ath0 inet dhcp<\/span>
\n<\/span>
\n<\/span>auto wlan0<\/span>
\n<\/span>iface wlan0 inet dhcp<\/span><\/p>\n
\n\u00a0<\/span><\/em>address 192.168.1.11<\/span><\/em>
\nnetmask 255.255.255.0<\/span><\/em>
\n<\/span><\/em>gateway 192.168.1.1 <\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/span><\/em>\u00a0<\/span><\/em><\/p>\n
\nAlso you can disable a network interface by using command<\/span><\/p>\n
\n<\/span><\/p>\n
\n<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"