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Chapter 5
Packet Classification and Labelling
E-NIT-CTC-20041213-0013 v0.5
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5.5 Expressions
Definition Expressions are used in rules for source and destination interface, source and
destination IP address (es) (ranges) and services.
There are three types of expressions :
Interface related expressions. These are expressions related to an interface like:
lan, wan,ipoa, pppoe, pppoa etc.
IP related expressions. These are expressions related to an IP address or range.
Service related expressions. These are expressions related to a service like
HTTP, FTP, IKE, SIP, etc.
Expressions command
group
The command group expressions (expr) consists of the following commands :
Adding an expression Execute the following CLI command to add an expression:
This command has added an expression of the type service with the name ftp using
protocol tcp and destination port 20.
Expression command group
expr add
delete
modify
list
flush
{Administrator}=>:expr add name ftp type serv proto tcp dstport 20