[Exim] Re: Mail relay problems

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著者: Derrick 'dman' Hudson
日付:  
To: 'exim-user list'
題目: [Exim] Re: Mail relay problems
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On Sun, Jun 09, 2002 at 08:39:26PM -0500, Cory Daehn wrote:
| So 16 is the bits?


Yes.  The CIDR notation is
    <network_addr_of_block>/<#_bits_in_netmask>


As a result,
    64.217.0.0/16
refers to a netblock starting with 64.217.0.0 as the "network"
address and ending with 64.217.255.255 as the "broadcast" address.
(unless you've setup your network oddly like they used to do with the
same network and broadcast addresses)


| Should my Class C entries be /8 or /256?


Neither. A /8 is a Class A. /256 is invalid for the same reason
/65536 is -- there aren't 256 bits in an IPv4 address. A Class C is a
/24 network. A /32 is a netblock with only a single address.

For example,
    127.0.0.1/32
is a netblock consisting of exactly 1 address, 127.0.0.1.


The first private Class C subnet is
    192.168.0.0/24


HTH,
-D

--

I tell you the truth, everyone who sins is a slave to sin.  Now a slave
has no permanent place in the family, but a son belongs to it forever.
So if the Son sets you free, you will be free indeed.
        John 8:34-36


GnuPG key : http://dman.ddts.net/~dman/public_key.gpg

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