Compatible-systems 5.4 Manuel d'utilisateur télécharger pdf (Page 220)

214 Chapter 13 - AppleTalk Filtering

• lteq, le, <=, or =< These are allowable ways of writing a “less than or

equal to” operator which will match the packet/information if its value is

less than or equal to the value specified in the option expression.

• gt or > These are allowable ways of writing a “greater than” operator

which will match the packet/information if its value is greater than the

value specified in the option expression.

• gteq, ge, >=, or => These are allowable ways of writing a “greater than

or equal to” operator which will match the packet/information if its value

is greater than or equal to the value specified in the option expression.

• ne, <>, or != These are allowable ways of writing an “inequality” oper-

ator which will match if the value in the packet/information is not equal

to the value specified in the option expression.

The options available for AppleTalk filter rules allow rules to be more

narrowly specified to exclude packets or other information based on a number

of additional factors.

• type <operator> <AppleTalk packet type> This option allows filtering of

the packet type from the AppleTalk DDP header. The value must be

between 1 and 255. The numbers of some well-known packet types are

listed below.

RTMP (1)NBP (2)ATP (3)

ECHO (4)RTMP Request (5) ZIP (6)

ADSP (7)SNMP (8)IP-in-AppleTalk (22)

DECnet-in-AppleTalk (68)

• srcnet <operator> <network number> This option allows filtering of

packets by the source network from the AppleTalk DDP header. The

value must be between 1 and 65279. The keyword all may be used to

specify all network numbers.

• dstnet <operator> <network number> This option allows filtering of

packets by the destination network from the AppleTalk DDP header. The

value must be between 1 and 65279. The keyword all may be used to

specify all network numbers.

• srcnode <operator> <node address> This option allows filtering of

packets by the source node from the AppleTalk DDP header. The node

value must be between 1 and 253.

• dstnode <operator> <node address> This option allows filtering of

packets by the destination node from the AppleTalk DDP header. The

node value must be between 1 and 253.

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Compatible-systems 5.4 Manuel d'utilisateur Page 220