11-12-2012
Some clients cannot ping UNIX server
All of sudden in this morning, some computers could not connect to our UNIX server while other still could.
Some computers could ping the server while some could not.
Same on the server side.
It could ping some clients but not some.
All Windows clients could ping each other.
And more, the pining capability became on and off on each clients not simultaneously.
I rebooted the server but same thing.
After a while of such craziness, it seems alright now.
But this is not the first time. I had very similar symptom for a Linux server a while ago.
Back then, pinging a clients from the server somehow kept the connection up.
So, I ran a script that pings several clients repeatedly.
The problem went away by itself after a while as well.
Anybody has seen something like this?
Any idea what has caused such issue?
I would appreciate any help.
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LEARN ABOUT DEBIAN
gems-server
GEMS-SERVER(1) gems documentation GEMS-SERVER(1)
NAME
gems-server - Transmit a shell session in real time.
SYNOPSIS
gems-server [-ip ip] [-port p] [-maxconn n] [-wait m] [-log dest] [-noscript] [-script_bin script]
gems-server -h | -v
DESCRIPTION
Transmits a shell session to be shown in real time in various different computers or terminals.
gems-server transmits data in real time to clients via a network connection. Each one of these clients must run the gems-client(1) program
to establish connection and receive the transmitted data. Clients can connect and disconnect at any given time, but of course they will
only receive the data that is transmitted while they are connected (just like a radio transmission/reception system).
The gems system is normally used to transmit a console session and show it in various computers at the same time, but it is also possible
to transmit any other kind of data.
OPTIONS
-ip IP address where connections will be accepted.
-port TCP port. Default: 6666.
-maxconn
Do not accept more than n simultaneous clients. Default: 25.
-wait Wait until m clients are connected before starting the transmission. This is useful to ensure that the first m clients will receive
all data transmitted. The default behavior is to start transmission immediately, without waiting for client connections.
-log By default, the server does not write log messages. This option configures the destination of logs. The dest argument can be `sys-
log' (to log through syslogd(8)), `stderr' (to log through standard error output), or it can be an arbitrary filename (log messages
will be appended to the file, if it exists).
-noscript
By default, the server executes the script(1) program to take terminal data and transmit it. When this option is used the server
will not run script, and data will be read form standard input.
-script_bin
Specifies the location of the script(1). program. Default: /usr/bin/script.
-h Show a short help message.
-v Show version information.
FILES
/var/lock/gems-server.PORT
Lock file. gems-server creates this file on initialization and deletes it on exit. PORT is replaced by the TCP port used. gems-
server will not run if this file is already present in the system.
AUTHORS
Diego Essaya <dessaya@fi.uba.ar>
Emiliano Castagnari <ecastag@fi.uba.ar>
SEE ALSO
gems-client(1), script(1), syslogd(8)
gems AUGUST 2004 GEMS-SERVER(1)