| Title: | DEC TCP/IP Services for OpenVMS |
| Notice: | Note 2-SSB Kits, 3-FT Kits, 4-Patch Info, 7-QAR System |
| Moderator: | ucxaxp.ucx.lkg.dec.com::TIBBERT |
| Created: | Thu Nov 17 1994 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 5568 |
| Total number of notes: | 21492 |
My customer has UCX V4.1 eco4/VMS v6.1 and wants to know if there
is a way to prevent the TNA device from disconnecting after they
hang up from the modem.
TNA vs. LTA
-- LTA devices will go OFFLINE when the Port that they are pointing
to becomes unavailable.=20
-- TNA devices will go OFFLINE when the Port that they are attached
to becomes unavailable.
-- LTA devices will go back ONLINE when the Port that they are
pointing to becomes available again.
** TNA devices do NOT go back ONLINE when the Port that they are
attached to becomes available.
The issue with TNA devices NOT becoming available, after the
Port they are attached to resets and raises DTR, is a problem
concerning modem connections. When a TNA device (Port) initiates a
modem connection, the modem attached to that port makes the connection
to the other modem and raises DCD. However when the TNA device is told
to drop the connection, the port on the server lowers DTR and this
triggers the modem to drop DCD - hence the modems disconnect and reset
themselves. When the server has dropped DTR -- the TNA device looses
its connection to the port and goes OFFLINE. The problem then is when
the port on the server raises DTR again (the port has reset itself)
the TNA device does NOT sense this and remains OFFLINE.
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 5546.1 | Hope that this clears this up | UCXAXP::GEMIGNANI | Thu May 29 1997 14:47 | 16 | |
First of all, the incoming TELNET (TNA) connections are accepted on
transient devices; that is, the TNA is deleted after the connection is
broken and the final deassignment of the device is performed.
For outgoing TNA devices (which are created with the TELNET
application's "CREATE_SESSION" command), the current implementation of
the TNDRIVER will place the device OFFLINE when the connection is
broken. There is currently no support for dynamic reconnection.
If dynamic reconnection were supported (which it will, in a future
release) then the reconnection attempt originates from the TNA device
to the remote end (i.e. where the modem is). TNAs do not behave
~~~exactly~~~ like LTAs do, as the TELNET connection actually
disappears while the device may always be present.
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| 5546.2 | Thanks. | ALFSS2::MOORE_E | Wed Jun 04 1997 03:32 | 11 | |
I am sorry it took so long to reply. I will pass the information
on to the customer. The transition from LTA to TNA will take
some time with this customer. I am sure they will be pleased
to know that this issue will be addressed in the future.
Thank you for your reply.
Eula Moore
CSC/UCX
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