You are using match-all which makes to match a packet with both SYN and FIN.
Split them and also use mask 0x3E for FIN

class-map type access-control match-all SYN
match field TCP dest-port eq 80
match field tcp control-bits eq 2 mask 0x3D

class-map type access-control match-all FILTER
match field TCP dest-port eq 80
match field tcp control-bits eq 1 mask 0x3E



With regards
Kings

On Thu, Jun 2, 2011 at 8:20 PM, Bruno <[email protected]> wrote:

> Check this statement
>
> class-map type access-control match-all FILTER
> match field TCP dest-port eq 80
> match field tcp control-bits eq 2 mask 0x3D
> match field tcp control-bits eq 1 mask 0x3D
>
> Will this catch either SYN OR FIN and other bits could be set as well? Is
> that right?
> --
> Bruno Fagioli (by Jaunty Jackalope)
> Cisco Security Professional
>
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