8-88 User’s Reference Guide

 

Add Input Filter

Enabled:

Yes

Forward:

No

Type...

Generic

Value:

0000C8E395000000

Mask:

FFFFFFFFFF000000

Offset:

6

Compare:

Equal

Chain to Next Filter:

No

ADD THIS FILTER NOW

CANCEL

Enter the packet specific information for this filter.

Note the Offset is set to look at a value six bytes into the packet, the Value is 0000C8E395000000 and the Mask is set to match only the hexidecimal digits we're interested in -- the ones that represent the MAC address.

The next item that's commonly evaluated in a Generic filter is the frame type. The frame type is located at an offset of twelve bytes. For IP packets it has a value of 0800 (hex) and for ARP the value is 0806 (hex). So a filter set summary to block all incoming IP and ARP packets looks like this:

+-#----

Value-------------

Mask--------------

Offst-Compare--

Chain---

On?-Fwd-+

+-------------------------------------------------------------------------

 

 

 

 

 

+

1

0800000000000000

FFFF000000000000

12

=

No

Yes No

2

0806000000000000

FFFF000000000000

12

=

No

Yes No

 

 

 

 

 

 

 

 

 

 

 

 

A filter set blocking all incoming IPX requires two filter rules. One to verify the byte with offset of 12 bytes is less than 600 (hex) ANDed (chained with) a filter that verifies the byte offset by 14 is not equal to FFFF.

The filter set should look like this (with the first filter rule's chain field set to “Yes” because the packet has to match both rules to be qualified as an IPX packet.)

+-#----

Value-------------

Mask--------------

Offst-Compare--

Chain---On?-Fwd-+

+-------------------------------------------------------------------------

 

 

 

 

 

+

1

0600000000000000

FFFF000000000000

12

<

Yes

Yes

2

FFFF000000000000

FFFF000000000000

14

=

No

Yes No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Netopia D7171 SDSL, D7100 SDSL, D3100-I IDSL, D3232 IDSL manual Add Input Filter

D7100 SDSL, D3232 IDSL, D3100-I IDSL, D7171 SDSL specifications

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