Installing and Administering PPP
Chapter 5 97
Security Techniques
Building a Stanza - General
Building a Stanza - General
Some general concepts to remember when writing a stanza are listed
here:
• Each stanza includes one or more numbers, addresses, or keywords,
separated by slashes (/).
• Each number, address, or keyword adds an additional qualifier to the
stanza.
• Each qualifier or pattern must match for the rule to be applied to the
packet.
• A stanza can be used to either permit or deny a matching packet.
• Begin with the negation operator (!) to block or deny a packet.
• Any stanza that is not negated permits matching packets.
• Comments begin with a ‘#' character and extend through the end of
the line.