Question

4

How to setup a static ip in Ubuntu? Where i need network, broadcast, dns parameters to fill in from my ISP?

rated 0 times [ 4] [ 0] / answers: 1 / hits: 12373 / 2 Years ago, sun, january 2, 2022, 10:30:41

I have a public ip as below which is static (my isp provided) as below:

IP Address: x.x.146.50

Subnet Mask:    255.255.255.240

Default Gateway:    x.x.146.49

DNS1:   x.x.1.196

DNS2:   x.x.7.196

But what is my Network, Broadcast and DNS (this scared me for ages, looking for a easy way to do 100% accurate calculating/math).

iface eth0 inet static

    address x.x.146.50

    netmask 255.255.255.240

    network ????????????

    gateway x.x.146.49

    broadcast ?????????

Follow up: (short cut)

$ ipcalculator 8.8.8.8/28

Address:   8.8.8.8              00001000.00001000.00001000.0000 1000

Netmask:   255.255.255.240 = 28 11111111.11111111.11111111.1111 0000

Wildcard:  0.0.0.15             00000000.00000000.00000000.0000 1111

=>

Network:   8.8.8.0/28           00001000.00001000.00001000.0000 0000

HostMin:   8.8.8.1              00001000.00001000.00001000.0000 0001

HostMax:   8.8.8.14             00001000.00001000.00001000.0000 1110

Broadcast: 8.8.8.15             00001000.00001000.00001000.0000 1111

Hosts/Net: 14                    Class A



1) It tells me Broadcast what to copy and paste

2) It tells me Netmask what to copy and paste

3) It tells me Network what to copy and paste

Now its Easy! i was always finding them complex in my head to do manual calculation and server is down for 20 days :P. Not not anymore.

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answered 2 Years ago poous · Accepted Answer

Your network is x.x.146.48 and your broadcast x.x.146.63.

Network and broadcast can be derived from ip and netmask. Netmask is used to separate the IP in two different segments (they are called network and host). If you look at your netmask in binary it looks like:

11111111.11111111.11111111.11110000

255     .255     .255     .240

The ones mark the network segment, the zeros the host.
You IP in binary is (I'm not going to translate the 146 as it is fully part of the network address):

x.x.146.0011-0010

From the netmask we know the last four digits is you host address, so your networks is.

x.x.146.0011-0000 or 48

The broadcast address is the same that the network one but with all the host bits at 1.

x.x.146.0011-1111 or 63

You can found much more info about ip routing and subnets in wikipedia.