From: Jan Kasprzak <kas@FORESTA.CZ>
Subject: Re: Jake IP sluzby projedou pres Novell
Date: Tue, 23 Jan 1996 11:09:56 GMT
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Daniel Docekal (daniel@MAIL.CODALAN.CZ) wrote: : Mimochodem, vas subjekt "jake ip sluzby projedou" svedci o nepochopeni : :) routingu. Routingu je JEDNO jake "sluzby" si skrz nej nekdo posila, : routing se deje na podstatne nizsi urovni, tj. proste propousti pakety : podle toho pro jakou sit jsou urceny, staci mu tedy vseho vsudy cilova : adresa paketu a zakladni informace o tom jak se ke ktere siti dostat. Nemate tak uplne pravdu (i kdyz u Novellu zrovna asi ano). Ale jinak si vetsina routeru umi nastavit filtr na to, ktere packety se kam budou posilat; treba ja si mohu rict, ze muj router bude forwardovat packety na port 23/tcp pouze z mych vlastnich subsiti, a nikoli z Internetu. Tim zabranim, aby mi nekdo zvenku telnetoval na moje stroje. Obvykle (BSD, Linux) se k tomu pouziva prikaz ipfw(8). Takze vetsina routeru/firewallu _umi_ filtrovat packety podle obsahu. Neni tedy pravda, ze : Nikdy v zivote se nedozvi jake "sluzby" ten paket obsahuje [...] -Yenya -- Jan "Yenya" Kasprzak, E-mail kas@foresta.cz, WWW http://www.fi.muni.cz/~kas/ [[[[ System Administrator at Foresta SG, a.s. (tel: +42-5-45222018) ]]]] [[[[ Linux Czech WWW Page: http://www.fi.muni.cz/~kas/linux/ ]]]] In accord with UNIX philosophy, Perl gives you enough rope to hang yourself. --Larry Wall, Randal Schwartz: Learning Perl
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