Firewall Wizards: RE: A fun smackdown...

["Ben Nagy" <ben () iagu net>]

> > "Be liberal in what you accept; be strict in what you send."
This was NEVER a security doctrine. It was an RFC doctrine, originally
(AFAIK) from RFC 791 (cf):
 
"In general, an implementation must be conservative in its sending behavior,
and 
 liberal in its receiving behavior."

RFCs are concerned with interoperability. Security is concerned with risk.
The two are not congruent. If you know anything about this history of the
Internet Protocol and the RFCs < 1000 in general, you would not characterise
it as security focused.

This is intuitive - well at least to me and all of the 'old timers' on this
list.

> -----Original Message-----
> From: firewall-wizards-admin () honor icsalabs com 
[...]
> On Tue, 17 May 2005, Martin wrote:
>
> > "Be liberal in what you accept; be strict in what you send."
[Paul, sensibly, rebuts ... ]
> _All_ effective security controls break that tenet.  The more 
> liberal your controls, the more risk you assume.
>
> Paul
To borrow the vernacular,

"w3rd."

ben


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