I have an interface with an IP in a class B subnet. I want to add another IP in the came class B as an alias on the same interface. What netmask should I use? Some people say to use 255.255.255.255, while others say to use the regular netmask of the network, i.e. 255.255.0.0 in my case. Which is correct, and more importantly why?
In case it matters, I'm using Linux (CentOS 5)