====== SIOCADDRT: File exists Error ======
\\ 
\\ 
I was getting this error on a MFEL, but it is applicable to any Linux server with multiple NICs.
\\ 
\\ 
==== The Problem ====
\\ 
I‘m typing the following command under Ubuntu Linux:
\\ 
    route add default gw 192.168.3.2 eth0
\\ 
But it is giving me out the following error:
    SIOCADDRT: File exists
\\ 
How do I fix this problem?
\\ 
\\ 
==== The Solution ====
\\ 
This error normally displayed when you try to modify or or add a new routing IP address. For example, when you set the same route multiple times you will get this error.
\\ 
\\ 
Understanding SIOCADDRT: File exists Message
\\ 
  - 1.SIOC: Serial Input Output Controller.
  - 2.ADD: ADD (addition).
  - 3.RT: RouTe (routing ip).
  - 4.File exists – Routing is already configured so delete wrong one and add the new one.
\\ 
\\ 

----

==== Display Current Routing Table ====
\\ 
Open a command-line terminal (select Applications > Accessories > Terminal), and then type the following command to see your current routing table:
\\ 
    netstat -r
    
    or
    
    ip route list
\\ 
==== Delete Wrong Routing IP Address ====
\\ 
Use the following syntax:
\\ 
    sudo ip route delete {IP/SUBNET} dev {INTERFACE}
\\ 
To delete default route 192.168.1.0/24 via eth0, enter:
\\ 
    sudo ip route delete 192.168.1.0/24 dev eth0
\\ 
==== Add Correct Routing IP ====
\\ 
Type the following command:
\\ 
    sudo ip route add default via 192.168.3.2
    
    OR
    
    sudo route add default gw 192.168.3.2 eth0
\\ 
==== Network Configuration File ====
\\ 
Edit, <color red>/etc/network/interfaces</color> file and setup the correct routing address:
\\ 
    auto eth0
        iface eth0 inet static
         address 192.168.3.10
         network 192.168.3.0
         netmask 255.255.255.0
         broadcast 192.168.3.255
         ### set router default ip here ###
         gateway 192.168.3.2
\\ 
\\ 
Originally from [[http://www.cyberciti.biz/faq/siocaddrt-file-exists-ubuntu-linux-error-solution/]]
\\ 
\\