On 3/19/23 03:28, cor...@free.fr wrote:
On 19/03/2023 18:00, David Christensen wrote:
On 3/18/23 16:31, cor...@free.fr wrote:
On 19/03/2023 06:17, Kushal Kumaran wrote:
On Sat, Mar 18 2023 at 07:28:23 PM, cor...@free.fr wrote:
Hello
I know 192.168.1.0/24 is a valid C range for network address.
but what does 192.168.1.1/24 mean?
I ask this just for a setting in the SPF:
spf.pinoad.se. 300 IN TXT "v=spf1
ip4:188.66.63.1/24 -all"
It means the same thing. 192.168.1.1/24 is the same range as
192.168.1.0/24, but written by someone not paying too much attention.
That's correct. Thanks.
AIUI:
* 192.168.1.0/24 identifies an IPv4 network with an address of
192.168.1.0 and a network prefix of 24 bits. The address is within
the reserved private block 192.168.0.0/16. The prefix corresponds to
a class C network.
* 192.168.1.1/24 identifies an IPv4 network interface with an address
of 192.168.1.1 and a network prefix of 24. The interface is
configured to communicate over the 192.168.1.0/24 network.
So for Inleed (a local ISP)'s SPF:
spf.pinoad.se. 300 IN TXT "v=spf1 ip4:188.66.63.1/24 -all"
They specify only 188.66.63.1 to send email?
But as far as I know their mailserver is 188.66.63.2:
mail.inleed.xyz. 300 IN A 188.66.63.2
Then this mail server should have problems in messages delivery.
Thanks
Corey
If I correctly understand Sender Policy Framework SPF Record Syntax:
http://www.open-spf.org/SPF_Record_Syntax/
The phrase "ip4:188.66.63.1/24" in the above DNS SPF record states that
outgoing mail will come from hosts in the address block 188.66.63.1/24.
The address 188.66.63.2 is within the published address block, so the
ISP is stating that mail sent by that host is legitimate.
On 3/19/23 03:38, cor...@free.fr wrote:
> So,
>
> * 188.66.63.1/24 is a range, not a single host in SPF
> * why it's not written as 188.66.63.0/24 which is more clear?
>
> Thanks
I agree that "188.66.63.0/24" would be a more conventional way to
specify a network address block. Perhaps you should ask the ISP why
they used "188.66.63.1/24".
David
