Security Flaws in IP The iP addresses are filled in by the originating host Address spoofing Using source address for authentication r-utilities(rlogin, rsh, rhosts etc.) 2111c Can a claim it is b to the server s? Internet .ARP Spoofing 1.13s Can c claim it is b to the server s? A11111112B 15-411: F08 security ° Source routingSecurity Flaws in IP • The IP addresses are filled in by the originating host  Address spoofing • Using source address for authentication  r-utilities (rlogin, rsh, rhosts etc..) Internet 2.1.1.1 C A 1.1.1.1 1.1.1.2 B 1.1.1.3 S •Can A claim it is B to the server S? •ARP Spoofing •Can C claim it is B to the server S? 15-411: F08 security •Source Routing 6