Tom Eastep wrote:

>       add_rule $chainref, q(-m string --algo kmp --from 2 --hex-string
>               "|010000010000000000000000020001|" -j DROP)

I misunderstood how string match works. The following rule restricts the
match to exactly the place in the message where the tell-tale pattern
occurs:

        add_rule $chainref, q(-m string --algo bm --from 29 --to 30
          --hex-string "|010000010000000000000000020001|" -j DROP);

-Tom
-- 
Tom Eastep        \ When I die, I want to go like my Grandfather who
Shoreline,         \ died peacefully in his sleep. Not screaming like
Washington, USA     \ all of the passengers in his car
http://shorewall.net \________________________________________________

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