Ethernet Support Guide for HP-UX 11i v3

4.3.7 Flowchart 6: Transport-level test
Use the process in this flowchart to check communications between transport layers on the source
and target host.
Figure 7 Flowchart 6: Transport-level test
YES
Configure TCP.
Enter telnet to
remote host.
Enter ftp to
remote host.
Transport-
level
test
telnet
succesful?
YES
ftp
successful?
NO
Is TCP
configured
on local and
remote
hosts?
NO
Network
congested?
NO
NO
YES
YES
Call HP
Stop
Call HP
Call HP
Repeat
transport-level
test
4.3.7.1 Flowchart 6 procedures
• Enter telnet to a remote host. If the process is successful, stop.
• If the process is not successful, try to establish an ftp link to a remote host. Unlike telnet,
ftp does not use a pseudoterminal (pty) driver on your system. This will determine if pty is
the cause of the telnet failure. If ftp is successful, call your HP representative to determine
why you have a problem with pty.
• If ftp fails, check whether TCP is configured on both hosts by verifying the /etc/protocols
file. Both telnet and ftp work at the transport layer and require TCP. If TCP is not configured,
configure it now and repeat the transport-level test.
• If TCP is installed on both hosts, telnet to another host and use netstat to check for lost
packets. If the network is congested, you may need to reconfigure the network. If network
congestion is not the cause of the problem, more detailed network diagnostics are required.
In either case, call your HP representative for assistance.
4.3 Diagnostic flowcharts 47