KCPENG@TWNCTU01.BITNET (11/03/90)
Hi netter,
There exist some problems in our network, though not(?) severe but indeed
annoying. The net consists of tens of various machine: Vaxs, Suns, HPs,
RS6000s, X-terminals... Some observable phenomenons follow:
. the Sun 4/370 console keeps printing the message a period of time -
'le0 : No carrier - transceiver cable problem?'
of course, it can still do network functions. Other Suns SSs just have
no such annoyance.
. there are 3 workstations, say A, B and C, networked together.
(O) ftp A to B
(O) ftp B to C
(X) ftp A to C
A, B = Sun, C = RS600. (B,C) and (A) are on two different repeter ports.
. another 2 hosts, say D and E, connected.
(O) telnet D to E
(X) telnet E to D
(X) telnet D to D
these two nodes are not on the same repeter port. I've re-invoked the
inetd of D, still in vain. (It seems D can telnet 'out' sometimes before)
What I'm concerned are,
1) what's the causes? repeater? cable? others?
2) any utility to monitor the network problems, like re-transmission rate?
or you have to put some command, like netstat, in cron table and run it
periodically, then do statistics yourself? if so, how do I suppose to know
the 'correct'(tolerable) value in all these statistical values?
3) some friend mentioned to me a product called 'cable scanner'. is it helpful
to the above problems?
Any clue is highly, highly welcome.
Regards,
Kai-Chih Peng,
kcpeng@twnctu01.bitnet