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class8 - CSCI 233 Internet Protocols Class 8 David C....

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11 CSCI 233 Internet Protocols Class 8 David C. Roberts
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22 Agenda n An Interesting Internet Protocol Product n Remote Login Applications--TELNET n File Transfer Applications—FTP, NFS n SMTP n POP
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33 New Product n Scanning Internet Camera n Pans, zooms, produces Internet video n Connects directly to the Internet n Doesn’t need a server
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44
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55 DDNS n What is DDNS? n How do you think it works?
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66 DDNS n Runs as DDNS server n Works with dynamic IP addresses n Software is added to host machine to  provide IP address to DDNS at startup n DDNS service maps DDNS name to  dynamic IP address
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Uses of The Product n Monitor any space; just connect it to the  Internet n Control, monitor the camera from  anywhere you have Web access n Shows the power, capability of the dumb  network that is available everywhere 77
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88 Remote Login n Client-server model can provide services  to multiple machines n Using TCP, interactive use of remote  machines can also be provided n Allow user to establish login session on  remote machine and execute commands
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99 TELNET Protocol n TELNET establishes TCP connection, passes  keystrokes from user’s keyboard to the remote  computer, brings back output to the user’s  screen n Services: n Network virtual terminal—standard interface n Client and server negotiate options n
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1010 TELNET Client and Server
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1111 TELNET Virtual Server (NVT) n TELNET client translates from user  terminal format into NVT format n Server translates NVT into local OS  requirements
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1212 TELNET NVT Control  Characters
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1313 TELNET Commands   Signal  Meaning IP  Interrupt Process (terminate running program) AO  Abort Output (discard any buffered output) AYT  Are You There (test if server is responding) EC  Erase Character (delete the previous character) EL  Erase Line (delete the entire current line) SYNCH  Synchronize (clear data path until TCP urgent data point, but do interpret commands) BRK  Break (break key or attention signal)
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1414 TELNET Command Encodings Command  Decimal Encoding Meaning IAC  255  Interpret next octet as command (when the IAC octet appears as data, the sender doubles it and sends the 2-octet sequence IAC-IAC) DON’T  254  Denial of request to perform specified option DO  253  Approval to allow specified option WON’T  252 
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class8 - CSCI 233 Internet Protocols Class 8 David C....

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