audrey said:
> The rule can't set because WebUI says below,
>
> ++ The following input errors were detected:
> ++     * There is already a 1:1 rule for the specified internal IP
> address.

Right, I forgot - m0n0wall uses ipnat's "bimap" for 1:1 mappings, and
multiple mappings to the same internal IP would cause the firewall not to
know which one to choose for outgoing connections... Not sure if ipnat
would just pick the first one, though. I'll have to check some time...

- Manuel