They might not be as guilty as you say. There are
several ways to make a list of valid addresses, by
"brute-forcing" different letter combinations with
EXPN, VRFY, or MAIL FROM/RCPT TO.
Cisco pretends to do this, but is not entirely successful. When setting up a router for the first time, you still have to figure out which network class your IP network is, and subtract subnet bits from that. (If you use the setup dialogue. It saves time otherwise)
ie. Subnet bits: 8 != cidr/8
This can sometimes be annoying. (every time I forget, it's annoying.:-)
We still use CIDR for anything else, including IP address delegation for the customers of the company where I work.
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They might not be as guilty as you say. There are
several ways to make a list of valid addresses, by
"brute-forcing" different letter combinations with
EXPN, VRFY, or MAIL FROM/RCPT TO.
(I work at an ISP, we see this from time to time)
I wish it was so.
/8
:-)
Cisco pretends to do this, but is not entirely successful. When setting up a router for the first time, you still have to figure out which network class your IP network is, and subtract subnet bits from that. (If you use the setup dialogue. It saves time otherwise)
ie. Subnet bits: 8 != cidr
This can sometimes be annoying. (every time I forget, it's annoying.
We still use CIDR for anything else, including IP address delegation for the customers of the company where I work.
Oh, well.