On Sat, 2004-11-06 at 02:07 +0800, adrian kok wrote: > Hi all > > Sth I want to clarify: > > 1/ > 240.0.0.0/5 - Class E Reserved > 248.0.0.0/5 - Unallocated > Sometimes I got it should /4 or /5 ? > 240.0.0.0/4 - Class E Reserved > 248.0.0.0/4 - Unallocated
Look at the official list(tm): http://www.iana.org/assignments/ipv4-address-space > 2/ Can I block it in the firewall for > "255.255.255.255/32 - Broadcast"? > > deny ip from any to 255.255.255.255/32 > deny ip from 255.255.255.255/32 to any You can block anything you like > 3/ I got the following. ls it normail? > why there is connection to the broadcast address > > tcp 0 1 202.64.230.8:33397 > 192.168.255.255:25 SYN_SENT 255.255 or anything ending in 255 doesn't need to be a broadcast interface. Welcome to the wonderful world of CIDR :) I guess you might want to take a look at: http://www.cymru.com/Bogons/index.html Greets, Jeroen
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