09-19-2001
Quote:
Originally posted by eddie
We buy dial-up accounts just for getting Internet connections.
Exactly. Whether or not you use the ISP's mail server is irrelevant. You are using their dial-up (or broadband) connection, and are therefore bound by their AUP.
Quote:
What reports the IP of my sendmail server to the recipients server? Sendmail daemon? Does the recipients server resolve the IP form the network packets (Network Layer of OSI)?
Yes. At some point the sending machine has to contact a recipient machine to send the message. Whether or not you have inserted your own fake headers at this point is irrelevant. When you make a connection to the recipient the recipient appends the connecting IP to the headers. You can hack your outgoing packets to include a fake source address if you like, but in that case you will have to use SMTP blind -- i.e. sending without ever seeing the responses to your commands.
Quote:
If we have to change something at the network layer to spoof the IP, I would like to give up.
You need access to raw sockets, which generally means root privileges. Unfortunately its not that hard to do. See nmap for example.
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