>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
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.
Am Tiergarten 22 Tel.: +49/69/4990880
D-60316 Frankfurt Fax : +49/6103/383-157
Germany privat: maass @
biz.: Joerg .
PGP signature available upon request.