Use global variable which defines the tmp_path and remove hardcoded ones.
Update link to traffic shaper config because HTTP/500 errors are bad mmmkay?
Hide Additional BOOTP/DHCP Options behind an advanced button like other items
Change size of columns to 10 and 55 for the number option rowhelper
Misc comments
Use intval()
Make sure entered # is a integer and use htmlspecialchars()
Add URL to custom BOOTP and DHCP options page hosted at iana.org
Reduce colspan to 3
Do not turn the fields red when restoring previously saved items
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