Slide 75

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RPC messages

$\begin{figure}\centerline{\epsfig{figure=/home/sri/courses/figs/eps/rpc-comm.eps,width=2.5in}} \end{figure}$

Identifying Programs and Procedures

100011    1   udp  32774  rquotad
100002    2   udp  32775  rusersd
100002    3   udp  32775  rusersd
100012    1   udp  32776  sprayd

Mapping to Protocol Port
- TCP/UDP port number is 16 bits
- RPC program number is 32 bits!
- Dynamic mapping (portmapper)

Sridhar Iyer
2001-01-08