rfc1978 help

Fri Nov 5 18:07:19 UTC 2004

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

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

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

Deny TCP 202.64.230.8:33021 10.254.254.254:25 

Deny TCP 202.64.230.8:57798 172.21.143.58:25 

Thank you so much