> As David pointed out, it is "reserved for future use - you must set
> these bits to zero and not use it _for your own purposes_.   For non-rfc
> use of these bits _will_ break something the day we start using them
> for something useful.
> 
> So, no reason for a firewall author to check these bits.

I thought that most firewalls were supposed to be insanely paranoid.
Perhaps it would be considered a possible covert data channel, as
farfecthed as that may sound.

rick jones
-- 
ftp://ftp.cup.hp.com/dist/networking/misc/rachel/
these opinions are mine, all mine; HP might not want them anyway... :)
feel free to email, OR post, but please do NOT do BOTH...
my email address is raj in the cup.hp.com domain...
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