Technical data

Configuring Serial Lines
3.4 Solving Serial Line Problems
Watch the modem’s LED display as you attempt to communicate using the
PING command.
You might not be able to ping the system if the serial line is tied up with a
large FTP operation.
9. Use the TCPTRACE command to see packets going in and out of the local
system. For information about using TCPTRACE, enter:
$ HELP TCPTRACE
10. Display a count of the packets being sent and received on the problem
interface, in full screen format, updated every second. For a SLIP problem,
enter:
TCPIP> SHOW INTERFACE SLn
To display the packet counts for PPP problem, enter:
TCPIP> SHOW INTERFACE PPn
In these commands, n is the interface number.
3.4.1 Solving PPP Problems
Keep the following in mind for PPP-specific problems:
• If the virtual terminal software has not been loaded, the following error will
be displayed when you try to connect:
%PPPD-E-NEEDVIRTTERM, point-to-point connection on device _TTB0: must
be done on a virtual terminal
Correct this problem by entering the following commands before you dial out:
$ RUN SYS$SYSTEM:SYSMAN
SYSMAN> IO
CONNECT VT/NOADAPTER/DRIVER=SYS$LOADABLE_IMAGES:SYS$TTDRIVER.EXE
SYSMAN> EXIT
To make this permanent, add the following commands to the
SYS$MANAGER:SYSTARTUP_VMS.COM file:
$ SET PROCESS/PRIVILEGE=CMKRNL
$ SYSMANIO = "SYSMAN IO"
$ SYSMANIO CONNECT VT/NOADAPTER/DRIVER=SYS$LOADABLE_IMAGES:SYS$TTDRIVER.EXE
Be sure to terminate any old virtual terminal sessions.
• If you are trying to use OpenVMS as a PPP client to your ISP (Internet
service provider), check where the ISP uses an authentication protocol,
such as CHAP, PAP, or RADIUS. These protocols are not supported and will
prevent a connection to OpenVMS.
3–16 Configuring Serial Lines