Hi Alex, At 2006-01-20 21:27, Alexandre Souza wrote: >> I don't think that the IP number can be faked >> because any computer receiving mail from another >> computer has to be connected to that other >> computer via the IP number of the other > >IP spoofing is a very common techinique.
I did some research using Google and here http://www.iss.net/security_center/advice/Underground/Hacking/Methods/Technical/Spoofing/default.htm it says: 'A common misconception is that "IP spoofing" can be used to hide your IP address while surfing the Internet, chatting on-line, sending e-mail, and so forth. This is generally not true. Forging the source IP address causes the responses to be misdirected, meaning you cannot create a normal network connection.' (And what else would the purpose of spoofing be other than hiding your IP address.) Here is a technical description of spoofing: http://www.securityfocus.com/infocus/1674 I think that from the description of the Simple Mail Transfer Protocol (SMTP) http://www.faqs.org/rfcs/rfc821.html it's clear that it's using TCP and not IP and therefore it's hard to break into an email dialog between two systems and especially to make sure that you can replace the first block of the email and without that first block it's quite useless. Furthermore that it's hard if not impossible to break into a dialog between two computers who aren't on your own local network. A local network like that of an internet provider and it's clients or a local business network. But I'm not an expert... Greetings, Jaap -- Author: Jaap van Ganswijk INET: [EMAIL PROTECTED] Fat City Hosting, San Diego, California -- http://www.fatcity.com --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
