Re: [SPAM] Re: [SPAM] [Full-Disclosure] Your daily internet traffic report

From: Hugo van der Kooij (hvdkooij_at_vanderkooij.org)
Date: 10/17/04

  • Next message: Honza Vlach: "Re: [Full-Disclosure] TCP / IP" 
    To: full-disclosure@lists.netsys.com
Date: Sun, 17 Oct 2004 11:19:23 +0200 (CEST)

    On Sat, 16 Oct 2004 lee.e.rian@census.gov wrote:

    > > > Most routers will regard any ICMP request to them as a low priority
    > issue.
    > >
    > > do they? icmp is not only about 'echo'. there's lot of
    > > other functions via type/code - fragmentation, mtu etc,
    > > vital for traffic signalization. administrators, who
    > > blindly closes all icmp traffic are plain stupid idiots.
    >
    > Lots 'o flame but no light.
    >
    > How about sharing your knowledge of why certain icmp traffic should be
    > allowed and the risks associated with allowing that traffic?

    Just to name one: Path MTU discovery (RFC 1191)

       This memo describes a technique for dynamically discovering the
       maximum transmission unit (MTU) of an arbitrary internet path. It
       specifies a small change to the way routers generate one type of ICMP
       message.

    Hugo. 

    -- 
	I hate duplicates. Just reply to the relevant mailinglist.
	hvdkooij@vanderkooij.org		http://hvdkooij.xs4all.nl/
		Don't meddle in the affairs of magicians,
		for they are subtle and quick to anger.
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