[Solved] Quick Question about Automatic CIDR generation on firewall rules

  • Hi,

    I am trying to create a firewall rule where a certain network can access a port on a local server.

    I assumed to create a firewall rule to a "single host", I would use CIDR:, meaning 32 bits in the mask.  Yet when I select the drop down for "single host or alias", it auto populates the mask to /31, which yields hosts:

    I don't want .103 active, why can't I specify /32?  Is /32 somehow an invalid CIDR?


  • LAYER 8 Netgate

    Single host just ignore the netmask pulldown and put in the host address. It really should hide instead of switching to /31.

  • Thanks!  That makes sense.

    I should have realized it when it turned grey it was no longer being considered, but it also tries to calculate it then turns it grey which threw me off.

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