RCA THOMSON SpeedTouchTM (Wireless) Business DSL Router - Manual (Page 96)

Chapter 7
Scenario 1: Residential user.
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Expressions We will now have a look at the http expression. Go to the expression page and select
the Service tab.
Expert mode -> IP Router -> Expressions
This will show you a list of service expressions defined by default.
When we click on the + next to the HTTP expression name we can see the
definitions used for this expression.
Here we can see that the expression http is used for packets :
 of the type TCP (proto=6) with destination port 80.
Again at the bottom of the page you can see the actual protocol instead of the
number.
If desired you can have a look at all the different expressions used for interactive
traffic. We will not discuss all the expressions here as the configuration principle is
the same for all of them. They all define a protocol and a port used by the service.