From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Mon Jun 16 2003 - 12:07:02 GMT-3
At 5:11 PM +0800 6/16/03, Chen Kwong Wai William wrote:
>?Dear all,
>
> Can anyone kindly explain to me what actually does, if I
>configure "no ip directed-broadcast" on an Interface? Thx a lot.
IP directed broadcast is off by default in modern IOS versions, to
protect against certain hacking attacks. See
http://www.isi.edu/in-notes/rfc2644.txt
>
> For example:
>
> (192.168.1.0/24) - (E0) Router (E1) - (192.168.2.0/24)
>
> Suppose, if directed broadcast is enable on E0, but disabled on E1, then:
>
> 1) From 192.168.1.0, "ping 192.168.2.255" will be blocked?
> 2) From 192.168.2.0, "ping 192.168.1.255" will be blocked?
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