LINUX SETUP GATEAWAY WITH ROUTE COMMAND

Linux setup default gateway with route command by NIXCRAFT on AUGUST 2, 2006 · 26 COMMENTS· last updated at AUGUST 16, 2007 Q. How do I setup default gateway with a route command? A. route command show and/or manipulate the IP routing table under Linux and UNIX oses. Route manipulates the kernel's IP routing tables. Its primary use is to set up static routes to specific hosts or networks via an interface after it has been configured with the ifconfig program. When the add or del options are used, route modifies the routing tables. Without these options, route displays the current contents of the routing tables. Display default route Following three-command display the current routing table: # route Output: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.1.0 * 255.255.255.0 U 0 0 0 ra0 default dsl-router 0.0.0.0 UG 0 0 0 ra0 $ /sbin/route Output: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 191.255.255.0 * 255.255.255.0 U 0 0 0 eth0 169.254.0.0 * 255.255.0.0 U 0 0 0 eth0 default 191.255.255.1 0.0.0.0 UG 0 0 0 eth0 You can use -n option, to display numerical addresses instead of trying to determine symbolic host names (via dns or /etc/hosts file). This is useful if you are trying to determine why the route to your nameserver has vanished. $ /sbin/route -n Output: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 191.255.255.0 0.0.0.0 255.255.255.0 U 0 0 0 venet0 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 venet0 0.0.0.0 191.255.255.1 0.0.0.0 UG 0 0 0 venet0 Please note that a destionation entry 0.0.0.0 (or default) is the default gatway. In above example 191.255.255.1 is a default gatway. Add / setup a new route The syntax is as follows: route add default gw {IP-ADDRESS} {INTERFACE-NAME} Where, IP-ADDRESS: Specify router IP address INTERFACE-NAME: Specify interface name such as eth0 For example if your router IP address is 192.168.1.254 type the following command as the root user: # route add default gw 192.168.1.254 eth0 OR use hostname such as dsl-router: # route add default gw dsl-router eth0 Setting route using GUI tools/command under Linux If you find above command hard to use, consider using GUI tools. If your are using Red Hat/CentOS/Fedora core Linux type following command: # redhat-config-network OR If you are using other Linux distribution use command: # network-admin

BACKUP DATA UNTUK 2 SERVER LINUX

Memakai Linux sebagai sistem operasi memiliki banyak kelebihan. Selain tahan virus, banyak fungsi-fungsi otomatis yang bisa dilakukan melalui script. Misalnya untuk melakukan backup atau sinkronisasi antar dua file-sharing server bisa dilakukan dengan command scp (server copy) yang dikombinasikan dengan cron untuk otomatisasi (scheduling). Command scp memerlukan fungsi ssh (secure shell) untuk bisa tersambung dengan remote server. Supaya ssh bisa langsung connect tanpa mengisikan password, caranya sebagai berikut : 1. Buat sebuah private/public key di local server ssh-keygen -t rsa 2. Copykan public key tersebut ke remote server scp ~/.ssh/id_rsa.pub remote_host: 3. Tambahkan key tersebut ke remote server trusted key Login ke remote server. Jika belum pernah membuat key sama sekali, jalankan ssh-keygen -t rsa guna menyiapkan directory untuk key. Kemudian tambahkan key yang baru dibuat tadi ke file authorized_keys Your ads will be inserted here by Easy AdSense. Please go to the plugin admin page to paste your ad code. cat ~/id_rsa.pub >> ~/.ssh/authorized_keys Ubah akses level file dengan command : chmod 644 ~/.ssh/authorized_keys 4. Sekarang coba anda login ke remote server melalui ssh ssh username@remote_server Jika langkah-langkah diatas benar, harusnya anda bisa masuk tanpa perlu mengetikkan password. 5. Buat script untuk copy file dari remote server scp username@remote_server:/remote_dir /local_dir Simpan command tersebut ke sebuah file (misal: mybackup.sh) dan ubah mode filenya dengan chmod 755 mybackup.sh Copykan file mybackup.sh ke directory /etc/cron.daily supaya bisa running otomatis tiap hari.