pfSense

IE8 on XP (pause for laughter) does not respect the JavaScript that disables the CIDR field when editing a host alias. As a consequence, if you edit a host alias to add an IP the CIDR field is active and set to 128, and the JavaScript also does not automatically reset that to 32 even on a Network type alias. The /128 gets saved in the alias and then leads to filter reload errors because it's not a valid mask for an IPv4 address.

Even if we do not fix the front-end JS we should be ignoring the CIDR field entirely for a host type alias. The page could use some sanity checking to make sure the user can't save the alias with a bad mask. Even if the browser is braindead we shouldn't allow the invalid input.

How to repeat using IE 8:
Create a host alias, add one IP, save.
Edit the host alias, click + to add a new row

Current versions of IE and other browsers properly handle/respect the JavaScript and have no issues, but in the interest of preventing foot-shooting, the validation and/or backend issue should be addresses.