Compatible Systems 5.4 Manuale Utente

At a minimum, every non-comment line in a filter set must include an action 
and a network expression. Together these components specify a filter rule that 
the device will follow when sending and/or receiving IPX RIP packets.

Every line in an IPX Route filter set must begin with the actions permit or 
deny, or the comment indicator #.

•

Lines which begin with permit specify that information meeting the 
conditions should be included in the IPX routing table.

•

Lines which begin with deny specify that information meeting the condi-
tions should not be included in the IPX routing table.

•

Lines which begin with # specify that the text on the line is a comment 
and should be ignored.

The network expression uses a set of operators to specify the conditions under 
which the rule will be satisfied. These operators are discussed below:

•

eq, ==, or =  These are acceptable ways of writing an "equality" operator 
which will match if the value in the routing information is equal to the 
value specified in the network expression.

•

lt or <  These are acceptable ways of writing a "less than" operator which 
will match if the value in the routing information is less than the value 
specified in the network expression.

•

lteq, le, <=, or =<  These are acceptable ways of writing a "less than or 
equal to" operator which will match if the value in the routing informa-
tion is less than or equal to the value specified in the network expression.

•

gt or >  These are acceptable ways of writing a "greater than" operator 
which will match if the value in the routing information is greater than 
the value specified in the network expression.

•

gteq, ge, >=, or =>  These are acceptable ways of writing a "greater than 
or equal to" operator which will match if the value in the routing infor-
mation is greater than or equal to the value specified in the network 
expression.

•

ne, <>, or !=  These are acceptable ways of writing an "inequality" oper-
ator which will match if the value in the routing information is not equal 
to the value specified in the network expression.

The keyword all may be used to specify all network number values in the 
network expression.