Mohan Parthasarathy wrote: > "Now, when bob receives the packet sent by Alice, he has no other knowledge > about Alice except the packet itself. In particular, the only information > he has about Alice is the source IP address in the packet". > > I am missing something here. Isn't the packet carrying any other > information at all ?
An attacker can change any field in the packet. However, if the attacker changes the source address, the packet is not about Alice any more. Thus, the packet does carry information, but the only piece of information that can be _securely_ relied on is the address. I think others, like Dave Thaler, are saying this more clearly here, probably due to my shortcomings in handling the English language. --Pekka -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
