Re: Using tn5250
Holger Schurig <[email protected]>
| Newsgroups | gmane.comp.emulators.tn5250 |
|---|---|
| Message-ID | <[email protected]> |
> When you press ENTER (or any function key), the data entered is > sent to your server and then a response (display refresh) is > sent back to the workstation from your server. If a packet is > lost in either direction the communication is "out of sync" - > the display waits for an answer from the server which is not > coming because: That is only half-ways true. Telnet doesn't use UDP, it uses TCP. And here the TCP/IP-Stacks (on your box and on the AS/400) will automatically retry the "lost" packet when no explicit or implicit ACK comes back. On Linux, this retry-behavior is tuneable, e.g. via /proc/sys/net/ipv4. > answer was totally / partially lost in the network. A totally lost answer will terminate the TCP/IP connection. However, note that with the default settings this can take a looooong time (more than half-n-hour!), because of the exponential backup. Just run wireshark / tshark on your client, press the ENTER key and observe the behavior. Now dismount the antenna on your AP and again press the ENTER key. And see what happens now :-) Be sure to keep tshark running until the connection will be terminated. Best regards, Holger -- http://www.holgerschurig.de -- This is the Linux 5250 Development Project (LINUX5250) mailing list To post a message email: LINUX5250-Zwy7GipZuJhWk0Htik3J/[email protected] To subscribe, unsubscribe, or change list options, visit: http://lists.midrange.com/mailman/listinfo/linux5250 or email: LINUX5250-request-Zwy7GipZuJhWk0Htik3J/[email protected] Before posting, please take a moment to review the archives at http://archive.midrange.com/linux5250.