Netmask automatically changes to 24

[David D Lowe]

Binary package hint: network-manager

I have added a new wireless connection with a WPA2 password and a manual IP address, like this:
IP address: 180.180.180.11, Netmask: 255.255.255.0 Gateway: 180.180.180.254
I also added two DNS servers.
The connection is flawless (pass my compliments to whoever responsible for this, I could never get it to work on Hardy). However, when I edit the wireless connection again, for some reason, the Netmask changes to 24. Just 24. The connection still works. Everything else is the same.
network-manager version: 0.7~~svn20080908t183521+eni0-0ubuntu2
I'm running Ubuntu Intrepid Ibex Alpha 5.

[Trygve Vea (trygve-vea-gmail)]

This is not a bug.

Ref. http://en.wikipedia.org/wiki/Netmask

The 24 means it is a 24 bit subnetwork, which is just another way of saying 255.255.255.0.

Regards, Trygve

[David D Lowe (flimm)]

OK, thanks.

[Robin Sheat (eythian)]

This is, however, a user-interface bug. It's something that unnecessarily causes confusion, and as such, probably should be fixed. Reopening, and marking confirmed as I've heard of other people having problems with it.

[David D Lowe (flimm)]

I don't experience this bug any more, I think it has been fixed.

[bigsicret (bigsicret)]

I meet the same issue with ubuntu 16.04.

[Hasindu (hasindudilshan10)]

I also have the same problem with ubuntu 16.04 :(
I can't share files with my windows machine :[

[arun gupta (bombshot)]

but still i m unable to connect to wifi

[blauhirn (blauhirn)]

This is still an issue in Ubuntu 16.04 up to the current date.
It is an interface bug, as Robin Sheat pointed out.

[Simon Rodan (simon-rodan)]

It is still an issue in Mint 19.1

[Simon Rodan (simon-rodan)]

A workaround seems to be to add two sets of addresses and then delete the top one (which will have the erroneously saved mas address).