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