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Inbound Traffic Filter Criteria and Actions

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3-7

DECnet Phase IV Criteria and Actions

You can filter inbound DECnet Phase IV traffic based on specified bit patterns in

the DECnet header.

Predefined DECnet Criteria

Table 3-4 lists the predefined criteria for DECnet Phase IV inbound traffic filters,

and the reference field, offset, and length for each criterion.

User-Defined DECnet Criteria

In addition to the predefined DECnet Phase IV filter criteria, you can create traffic

filters with user-defined criteria by specifying an offset and length to this

reference field in the DECnet header:

DECnet Actions

The DECnet Phase IV filtering actions are Accept, Drop, and Log.

Table 3-4. Predefined Criteria for DECnet Phase IV Inbound Traffic

Filters

Criterion Name Reference Field Offset Length

Destination Area DEC4_BASE 0 6

Destination Node DEC4_BASE 6 10

Source Area DEC4_BASE 16 6

Source Node DEC4_BASE 22 10

Reference Field Description

DEC4_BASE Points to the first byte in the header

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 183 184

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