Home page logo
/

nanog logo nanog mailing list archives

Re: Reporting Little Blue Men
From: Eric Osborne <osborne () notcom com>
Date: Thu, 22 Jan 1998 11:41:28 -0500 (EST)

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




  By Date           By Thread  

Current thread:
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]