[14712] in North American Network Operators' Group
Re: Reporting Little Blue Men
daemon@ATHENA.MIT.EDU (Eric Osborne)
Thu Jan 22 11:53:30 1998
From: Eric Osborne <osborne@notcom.com>
To: ferguson@cisco.com (Paul Ferguson)
Date: Thu, 22 Jan 1998 11:41:28 -0500 (EST)
Cc: osborne@notcom.com, dave@fast.net, eric@ccti.net, nanog@merit.edu
In-Reply-To: <3.0.5.32.19980122112000.00848870@lint.cisco.com> from "Paul Ferguson" at Jan 22, 98 11:20:00 am
Yeah, but the original post said something along the lines of
"any packets to or from my network to a broadcast address". It's not the
"to" part of that which is a problem, but the "from" - as you know, x.y.z.3
can be a host or a broadcast address (if it's a /30 mask).
In other words, I can't prevent my customers from sending packets to
a broadcast address, esp. on a subnet smaller than /24. You might be
able to block outgoing packets for destination x.y.z.255, but if you've got
a mask >/24 (/23, etc..), couldn't .255 be a valid host address?
Just being picky, I suppose....
eric
>
> At 10:55 PM 1/21/98 -0500, Eric Osborne wrote:
>
> >How do you prevent packets from your network with a broadcast address, since
> >what defines a "broadcast" address really depends on the subnet mask?
> >
>
> "no ip directed-broadcast"
>
> - paul
>
