Hi, Just wanted to discuss a minor point in the CERT and other advisories. They mention that NFS and Sun RPC in general are vulnerable to the sequence number attack. It is true that nfs and other rpc's do rely on IP address for authentication but I dont see how they are vulnerable to an attack. You need to see the reply in order to get a filehandle in order to do anything with nfs. As for Sun RPC, it doesn't trust any host as its just a tool for writing protocols. Are there other RPC protocols which are vulnerable to this attack? Am I overlooking something about NFS? Did someone just put 2 (fake source IP) and 2 (protocol relies on IP for authentication) together and get 3 (NFS is vulnerable to this attack)? Tim N.