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I have to configure an ubuntu hardy server network interface.

The service hoster told me that this is the network data for the machine:

IP Range:  111.111.200.74 to 111.111.200.78
Netmask:   255.255.255.248
Broadcast: 111.111.200.79
Gateway:   111.111.200.73
Subnet:    111.111.200.72/29

I am only using the first IP address. I will update the /etc/hosts file with 111.111.200.74, but I am still unsure how the /etc/network/interfaces file should be. This is my plan:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
  address   111.111.200.74
  netmask   255.255.255.248
  network   111.111.200.???
  broadcast 111.111.200.79
  gateway   111.111.200.73

As you can see I don't know how to build the network line. How would I calculate the data for the network line and what is the result?

(I changed the first 2 octets of the subnet, they are not "111.111" in the real setup.)

Edit: This is what I will use, constructed from the accepted answer below:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
  address   111.111.200.74
  netmask   255.255.255.248
  # the following line is optional/redundant, 
  # because address and netmask are given above:
  network   111.111.200.72
  broadcast 111.111.200.79
  gateway   111.111.200.73
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1 Answer 1

up vote 2 down vote accepted

you should be able to leave that out as long as your netmask and address are correct.

There are also online calculators like subnet-calculator.com if you want to fill it in.

In your current example it's included in "111.111.200.72/29". "/29" is the encoded subnetmask, "111.111.200.72" is the network ip

share|improve this answer
    
So in this example there would be no need to visit that page? I use the line "network 111.111.200.72" and that's it? Just to be on the safe side. Thank you –  user12096 Mar 26 '10 at 9:31
    
yes, you dont have to calculate it, .72 is correct or just leave out the line completely, works fine too –  tliff Mar 26 '10 at 9:35
    
I updated the machine's config and restarted networking, it seems alive :-) Thank you! –  user12096 Mar 26 '10 at 9:44

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