[75131] in North American Network Operators' Group
Re: rfc1978 help
daemon@ATHENA.MIT.EDU (Jeroen Massar)
Fri Nov 5 13:33:18 2004
From: Jeroen Massar <jeroen@unfix.org>
To: adrian kok <adriankok2000@yahoo.com.hk>
Cc: nanog@merit.edu
In-Reply-To: <20041105180719.7777.qmail@web21202.mail.yahoo.com>
Date: Fri, 05 Nov 2004 19:32:27 +0100
Errors-To: owner-nanog-outgoing@merit.edu
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On Sat, 2004-11-06 at 02:07 +0800, adrian kok wrote:
> Hi all
>=20
> Sth I want to clarify:
>=20
> 1/=20
> 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"?
>=20
> 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
>=20
> tcp 0 1 202.64.230.8:33397 =20
> 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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