Hi Walter,
>Where is stock OSes?
>
I don´t understand your question, I´m afraid... If you wanted to ask for
implementations, both Ultrix and OSF/1 have a so-called screend, which is a
sophisticated packet filter (add a little marketing sugar here :-). You can
configure them into the kernel and then edit a plain english configuration
file. Check out the documentation or send me a mail
(Joerg .
Maass @
frs .
mts .
dec .
com) if you need more help.
>>> Uh, the interface a packet arrived on is available from the mbuf
>>>header in 44bsd systems. I've used this fairly easily to build a
>>>fairly minimumal packet filter so that "virtual private networking"
>>>(encrypting and sending to a branch office) works, and isn't spoofed
>>>by packets arriving from the "public" interface.
>>> This is possible in 43BSD/SunOS too, thanks to a little kludge.
>>>
>>
>>Possible on Ultrix and OSF/1 from Digital Equipment, too.
>>
--
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Maass @
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mts .
dec .
com
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