From: Justin Menga (Justin.Menga@xxxxxxxxxxxxxxxxxx)
Date: Wed Dec 06 2000 - 07:00:01 GMT-3
Oops, sorry, yep, think of it as the wild card inverse mask....
-----Original Message-----
From: Fred Ingham [mailto:fningham@worldnet.att.net]
Sent: Wednesday, December 06, 2000 8:30 AM
To: Justin Menga; ccielab@groupstudy.com
Cc: 'Simon Hopkins'
Subject: Re: LSAP Filter
Better to think of the mask as a wild card mask similiar to
that used in access-lists. 0x0404 0001 will permit a DSAP
of 0x04 and a SSAP of 0x04 or 05. As stated in the original reply the
last bit of the SSAP is the C/R bit and can be either a 0 for a command
packet or 1 for a response packet.
HTH, Fred.
Justin Menga wrote:
>
> Hi,
>
> The mask is just a bit mask like your normal subnet masks. THe
> representation is just in hex - at the end of the day, just convert to
> binary and it becomes apparent.
>
> e.g.
> 0404 mask 0001 = 0000 0100 0000 0100 MASK 0000 0000 0000 0000 0001
>
> In other words, the last bit of the LSAP (the SSAP C/R field) can be
> anything. In Hex this works out to 0404 and 0405.
>
> -----Original Message-----
> From: Simon Hopkins [mailto:simon@muddypaws.net]
> Sent: Tuesday, December 05, 2000 7:45 AM
> To: ccielab@groupstudy.com
> Subject: LSAP Filter
>
> Can anyone explain how the mask works on an LSAP filter e.g
>
> access-list 201 permit 0x0404 0x0001
> access-list 201 permit 0x0C0C 0x0001
>
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