[45214] in North American Network Operators' Group
Re: traffic filtering
daemon@ATHENA.MIT.EDU (J.F. Noonan)
Tue Jan 22 14:57:50 2002
Date: Tue, 22 Jan 2002 13:57:07 -0600 (CST)
From: "J.F. Noonan" <jfn@msc.com>
To: Joe Abley <jabley@automagic.org>
Cc: <nanog@merit.edu>
In-Reply-To: <20020122123455.Q29612@buffoon.automagic.org>
Message-ID: <Pine.BSI.4.33.0201221353480.21067-100000@pcjfn.msc.com>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Errors-To: owner-nanog-outgoing@merit.edu
On Tue, 22 Jan 2002 at 12:34pm Joe Abley wrote:
>
> On Mon, Jan 21, 2002 at 05:53:16PM -0500, Stephen Griffin wrote:
> > I'm curious about how many networks completely filter all traffic to
> > any ip address ending in either ".0" or ".255".
>
> I heard recently that Windows 2000 will refuse to send packets
> to addresses with the least-significant octet 255, if the most-
> significant octet indicates the address lies in a pre-CIDR class
> C. So, for example, 192.168.0.255 would be unreachable from a
> windows 2000 machine, regardless of the fact that it might be
> a legitimate host numbered within 192.168.0.0/23.
Not true. M$ is guilty of many evil things, but not this one.
--
Joseph F. Noonan
Rigaku/MSC Inc.
jfn@msc.com
-------------------------------------------
Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
C:\>tracert o2
Tracing route to o2.msc.com [12.110.0.218]
over a maximum of 30 hops:
1 <10 ms <10 ms <10 ms netb.msc.com [192.246.38.10]
2 <10 ms <10 ms <10 ms 172.16.16.2
3 <10 ms 10 ms <10 ms 12.124.26.249
4 <10 ms 10 ms <10 ms gbr2-p51.hs1tx.ip.att.net [12.123.134.18]
5 <10 ms <10 ms 10 ms gbr3-p40.dlstx.ip.att.net [12.122.2.97]
6 10 ms 10 ms 10 ms gbr4-p60.dlstx.ip.att.net [12.122.1.138]
7 30 ms 30 ms 30 ms gbr4-p50.dvmco.ip.att.net [12.122.2.102]
8 30 ms 30 ms 30 ms gbr1-p20.dvmco.ip.att.net [12.122.5.22]
9 40 ms 40 ms 40 ms ar1-p3110.slkut.ip.att.net [12.123.207.5]
10 40 ms 40 ms 40 ms 12.127.107.26
11 50 ms 40 ms 60 ms fw-utah.msc.com [12.110.0.130]
12 40 ms 40 ms 60 ms o2.msc.com [12.110.0.218]
Trace complete.
C:\>
