Firewall Wizards mailing list archives

Re: Q on external router


From: Bernhard Schneck <Bernhard_Schneck () genua de>
Date: Wed, 22 Apr 1998 21:31:59 +0200

In message <Pine.SUN.3.95.980422171232.27846D-100000 () is3 hk super net> you writ
e:
After posting my question, I searched the archive at nfr.net and the
argument by "Adam Shostack" against a switch in the DMZ was not that it
cannot prevent sniffing but rather, it may not stand malicious attack.
However, he did not quote any concrete evidence or example because these
are relatively new.

Switches have finite storage for ARP entries (usually some power of
2, say 4096 or 8192).  Flood them with enough (bogus) ARPs and most
of them will start passing all packets.

POOF.

\Bernhard.



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