- , , , "" -. - , SMTP .
TCP- : sequence number ( C-SYN), , (C-ACK) sequence number (S-SYN). (S-ACK). . sequence number acknowledge number. .
, , sequence number (S-SYN ) . TCP/IP. , 4.3BSD sequence number, , 125000. , , (, ) sequence number . TCP/IP sequence number, .
, , A B, , B "rlogin A" A, . , C. A , B C - .
- B , . , B. , , . B, , A ( ). IP-, , A, sequence number . IP-, B. A sequence number, B. B ( ), , , . , sequence number B. "" A, B S-ACK (, , sequence number , A). , sequence number , . IP-, . , rsh, .rhosts /etc/passwd .
|
|
: IP-spoofing , . . - . ( ) , . , B ICMP-? IP-spoofing? -, sequence number ( ). , sequence number sequence number (, ). firewall ( IP-), , , , . , . , . , , , , IRC ( Internet IRC, ..). TCP/IP- IP-spoofing' ( , ). , , firewall , , , .