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How do I disable the route / from CentOS or RHEL 6 Linux server?
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OpenBSD: Static Routing Configuration

I know how to setup static routing under Linux and FreeBSD operating systems. But, how do you setup static routing under OpenBSD operating systems?
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My home Linux laptop is connected to ADSL router and whenever I run route -n command at the prompt it says is set to my routers IP What is the meaning of
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Ubuntu Linux: Find Out Default Gateway

How do I find out default gateway IP address (default router IP assigned) for my Ubuntu Linux systems?
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Solaris UNIX Add Static Routes

Q. How do I add Static Routes under Solaris UNIX? My default gateway configured in /etc/defaultrouter, but what is the proper place to configure static routes for a Solaris UNIX server? Can you tell me exact configuration file name for a static routing?
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FreeBSD Set a Default Route / Gateway

Q. How do I modify or set a default route for my FreeBSD server? How do I make default route configuration persistent?

A. The route command is used under FreeBSD to manually manipulate the network routing tables. It provides six commands:
=> add : Add a route.

=> flush :Remove all routes.

=> delete : Delete a specific route.

=> change : Change aspects of a route (such as its gateway).

=> get : Lookup and display the route for a destination.

=> monitor : Continuously report any changes to the routing information base, routing lookup misses, or suspected network partitionings.

Task: View / Display FreeBSD Routing Table

Use netstat command with -r option:
$ netstat -r
$ netstat -rn


Routing tables
Destination        Gateway            Flags    Refs      Use  Netif Expire
default            61.221.xx.yy       UGS         0      247    em1
10               UGS         0       50    em0
10.10.110/26       link#1             UC          0        0    em0        00:1b:0d:e6:58:40  UHLW        2        0    em0   1145
61.221.xx.yy/29    link#2             UC          0        0    em1
61.221.xx.yy       00:1b:0d:e6:57:c0  UHLW        2        0    em1   1055
61.221.xx/24       link#2             UC          0        0    em1          UH          0        0    lo0

The first two line displays default routes.

Task: FreeBSD Set a default route

All network packets that cannot be sent according to the previous entries of the routing table are sent through the following default gateway:
# route add default

How do I save routing information to a configuration file?

If you reboot FreeBSD box, the routing configuration will be lost i.e. the routing information will not persist. You need to edit /etc/rc.conf file to set defaultroute:
# vi /etc/rc.conf
Set default route by editing defaultrouter variable:
Save and close the file.

Task: Start and Stop FreeBSD Configured Interfaces

To apply changes to a configuration file, you need to stop and restart the corresponding FreeBSD networking interface. The following command will also update routing information:
# /etc/rc.d/netif restart
# /etc/rc.d/routing stop
# /etc/rc.d/routing start

Further readings:

  • Read man pages netstat, route, rc.conf

How do I find out my gateway IP for a computer or a network device that allows or controls access to another computer or network under Linux / UNIX operating systems?
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