Archived from groups: comp.security.firewalls (
More info?)
xiebopublic@gmail.com writes:
> Thank you very much for your advice. I've tried the search engine of
> www.rfc-editor.org, and it has no any result for "telnet proxy" or
> "telnet gateway". I also have tried google, but not result too. That's
> why I post it here.
one pointed to by
http://www.rfc-editor.org/repositories.html
not specifically search
http://www.garlic.com/~lynn/rfcietff.htm
but categorization (organized by keywords found in titles and
abstracts) ... click on "Term (term>RFC#)" in "RFCs listed by" section
.... and find/move down to "proxy"
proxy
see also firewall
3820 3666 3665 3620 3603 3527 3487 3413 3361 3319 3313 3261 3238
3143 3135 3040 2844 2843 2607 2577 2573 2543 2322 2273 2263 2186
1919
clicking on the RFC number, brings up the RFC summary in the lower
frame. clicking on the ".txt=nnn" field retrieves the actual
RFC.
proxies started out being stub applications that did application-level
sanity checking of incoming requests (aka you actually had an
application that listened on the socket ... accepted the tcp
connection ... did minimal processing and then created a new tcp
connection to the "real" application, forwaring the information). much
of the early checking was trying to catch things like buffer overflow
exploits
http://www.garlic.com/~lynn/subpubkey.html#overflow
for instance
1919 I
Classical versus Transparent IP Proxies, Chatel M., 1996/03/28
(35pp) (.txt=87374) (Refs 959, 1383, 1597)
in contrast, early firewalls started out doing various kind of
checking & filtering below the application level.
early on, you also had (port) wrappers ... possibly running on same
machine (rather than boundary machine). the wrappers might provide
things like different authentication checking (aka rather than have
straight telnet userid/password ... front-end providing more
sophisticated authentication processes ... before directly contacting
telnet). i don't have keyword entry for wrappers.
--
Anne & Lynn Wheeler | http://www.garlic.com/~lynn/