Security and Integrity, Cont'd EID source routing: does not inherit IP source routing difficulties b/c receivers don't reverse routes to reply to senders Source EIDs can be spoofed  But today's source IP addresses can be spoofed  Detectable under two-way communication: Host A EID: e a IP: i a Server EID: f IP: j Host B EID: e b IP: i b ibib j ebeb f
{}