Bugtraq mailing list archives

Re: ICMP ECHO_REQUEST on BROADCAST--HOWTO Filter!

From: mfm () FRII COM (Mfm)
Date: Tue, 29 Jul 1997 09:39:52 -0600


        And a final note: there are very few applications which depend
on the routing of broadcast packets.  You may know of one such
application; if it's a popular one that you think lots of people are
using, speak up.  So you should feel safe in blocking broadcast traffic
in your network.  Popular applications which depend on *non*-routed
broadcast traffic include RIP and netbios (Microsoft's networking
protocol).  Putting filter access-lists on your interfaces should
not interfere with non-routed broadcast traffic.



I know of one such program.  In order to print to HP JetDirect printers,
you need either the JetAdmin program, or the drivers to go with it.
Either way, when you print to a printer that is not on the local subnet,
you are routeing broadcast packets.  And yes, I found this out the hard
way.


Jake
Frii.com Support Services

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