{"id":219,"date":"2015-09-07T06:59:32","date_gmt":"2015-09-07T06:59:32","guid":{"rendered":"http:\/\/onlinelab.info\/?p=219"},"modified":"2015-09-07T06:59:32","modified_gmt":"2015-09-07T06:59:32","slug":"how-to-use-linux-as-router","status":"publish","type":"post","link":"https:\/\/www.asianux.org.vn\/index.php\/2015\/09\/07\/how-to-use-linux-as-router\/","title":{"rendered":"How to use Linux as router"},"content":{"rendered":"

Linux as a Router<\/h3>\n

In this practical we are using three computers. One Linux system will be use for routing and reset two will remain in two different networks. First we will configure the system which is going to play the role of router.<\/p>\n

How to create virtual LAN card<\/p>\n

Configure server system<\/h3>\n

You need two LAN card for routing between two networks or you can create virtual LAN card instead of deploying them physically.<\/p>\n

To create virtual Ethernet card change directory to \/etc\/sysconfig\/network-scripts<\/strong><\/p>\n

\"change<\/p>\n

ifcfg-eth0<\/strong> is the necessary script file for Ethernet 0. Copy this file to the same folder to create new virtual LAN cards.<\/p>\n

\"cp<\/p>\n

Now on this newly created virtual LAN card. It could be done by service network restart<\/strong><\/p>\n

\"service<\/p>\n

Run setup<\/strong> command and select network configuration sub window from list<\/p>\n

\"setup<\/p>\n

You have two LAN card here, select eth0<\/strong> from list to assign IP<\/p>\n

\"select<\/p>\n

<\/ins><\/ins><\/ins><\/div>\n

This Ethernet card will be the default gateway of first network set its IP to 192.168.1.254<\/strong> and click on ok<\/p>\n

\"assign<\/p>\n

Now select eth0.1<\/strong> ( This our virtual LAN card which we create in our last sections)<\/p>\n

\"select<\/p>\n

Set its IP to 192.168.0.254<\/strong> This will be the default gateway of other network. Click on OK<\/strong> then quit<\/strong> and quit<\/strong> to come back on command prompt<\/p>\n

\"assign<\/p>\n

IP forwarding can be enabled by editing in \/etc\/sysctl.conf<\/strong> file. open this file<\/p>\n

\"vi<\/p>\n

Locate the net.ipv4. ip_forward = 0 tag<\/strong>. and replace the value 0<\/strong> to 1<\/strong>. This will enable IP forwarding to permanently . But this require a system reboot.<\/p>\n

<\/ins><\/ins><\/ins><\/div>\n

\"change<\/p>\n

If don’t want to restart the system you can tell running kernel directly by echo<\/strong> command and kernel will enable the IP forwarding<\/p>\n

\"echo<\/p>\n

now configure our client system. we are using two system one from each network to test the connectivity .<\/p>\n

Our first system is a Linux machine run setup<\/strong> command on it<\/p>\n

\"setup<\/p>\n

assign its IP address to 192.168.0.1<\/strong> with a default gateway of 192.168.0.254<\/strong><\/p>\n

\"assign<\/p>\n

now restart the network service and check connectivity form its default gateway ( Server IP)<\/p>\n

\"ping\"<\/p>\n

Now go on our other host which we are using a window machine ( You can also use Linux host ) and set IP address to 192.168.1.1<\/strong> with a default gateway to 192.168.1.254<\/strong><\/p>\n

\"ip<\/p>\n

now open command prompt and test connectivity with default gateway<\/p>\n

\"ping<\/p>\n

At this point you have completed all necessary step’s to enable routing its time to verify this<\/p>\n

<\/ins><\/ins><\/ins><\/div>\n

Test from windows system<\/h3>\n

ping<\/strong> the Linux host located on other network<\/p>\n

\"ping<\/p>\n

Test from Linux system<\/h3>\n

ping<\/strong> the Window host located on other network<\/p>\n

\"ping<\/p>\n","protected":false},"excerpt":{"rendered":"

Linux as a Router In this practical we are using three computers. One Linux system will be use for routing and reset two will remain in two different networks. First we will configure the system…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-219","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/www.asianux.org.vn\/index.php\/wp-json\/wp\/v2\/posts\/219","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.asianux.org.vn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.asianux.org.vn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.asianux.org.vn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.asianux.org.vn\/index.php\/wp-json\/wp\/v2\/comments?post=219"}],"version-history":[{"count":0,"href":"https:\/\/www.asianux.org.vn\/index.php\/wp-json\/wp\/v2\/posts\/219\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.asianux.org.vn\/index.php\/wp-json\/wp\/v2\/media?parent=219"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.asianux.org.vn\/index.php\/wp-json\/wp\/v2\/categories?post=219"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.asianux.org.vn\/index.php\/wp-json\/wp\/v2\/tags?post=219"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}