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Re: traffic filtering

  • From: J.F. Noonan
  • Date: Tue Jan 22 15:53:06 2002



Never mind.  Brain several iterations behind keyboard.  It was
kindly pointed out to me offlist.  I will now return to lurking
where I belong.

thx,


On Tue, 22 Jan 2002 at 1:57pm J.F. Noonan wrote:

>
>
> 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:\>
>
>
>
>
>





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