rfc1978 help
Jeroen Massar
jeroen at unfix.org
Fri Nov 5 18:32:27 UTC 2004
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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