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Full Discussion: Serious un-pingable stumper of a problem...
Special Forums IP Networking Serious un-pingable stumper of a problem... Post 302161471 by jjinno on Thursday 24th of January 2008 07:02:13 PM
Old 01-24-2008
Serious un-pingable stumper of a problem...
I have been busting my head over a network issue at work recently. I believe the problem to be in the L2 domain, but "the powers that be" believe that it looks more like a server port related problem. And the biggest problem of all is that EVERYBODY in the Engineering Department uses this file-server...

The symptoms are as follows:
  • A samba connection is shared out from "FileServ_1" to my desktop. While having a file open for read/write, I will lose the file (aka. the persistence of connection), and will be prompted by my App to save a local copy (lucky me).
  • From that point, I immediately (being prepared) switch to a shell in which I kick off a ping to "FileServ_1"... then another shell I bypass DNS & go straight for the IP... then another shell I have a remote connection from a totally different subnet, also pinging "FileServ_1"... and finally a trace-route running from both my desktop and the remote connection.
  • From ALL pings I receive timeouts & from all traces I find the last hop is the dead-zone.

Although "the powers that be" make a strong case for their point, I have noticed "network topology changes" being reported at the switch (indicating a loop?) and I have been able to serial-console "FileServ_1" and watch it while it is supposedly "down"... only problem is: It never thinks that it is down.
  • Eth1 (till last week was the only port plugged in) never reports any issues (at least not at any default log levels) and from what I can see there is no way to tell if the ICMP packets are dying on the way in or on the way out.

Finally, as if things were not bad enough, they decided last week to make Eth0 a redundant fail-over for Eth1... which amazingly seemed to lighten the problem from "a few minutes of un-ping" to "a few seconds of un-ping"... and now, instead of happening 10 times a day it happens only once or twice.

So first things first (unless you have better ideas), I am wondering how to turn up the logging of ICMP (thats kernel level right?) and possibly Eth* logging so that I don't have to resort to sniffing for the entire day till it happens. Cause if nothing else, I would like to diagnose this problem correctly and get something done about it.

Any Help?
 

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LEARN ABOUT SUNOS

ping-connection-pool

asadmin-ping-connection-pool(1AS)				   User Commands				 asadmin-ping-connection-pool(1AS)

NAME

       asadmin-ping-connection-pool, ping-connection-pool - tests that a connection pool is usable

SYNOPSIS

       ping-connection-pool --user admin_user [--password admin_password] [--host localhost] [--port 4848] [--secure|-s] [--passwordfile filename]
       [--terse=false] [--echo=false] [--interactive=true] pool_name

       Tests that a connection pool is usable for both JDBC connection pools and connector connection pools. For example, if you create a new JDBC
       connection  pool for use with an application that is expected to be deployed, before deploying the application, the previously created pool
       is tested with this command.

       This command is supported in remote mode only.

OPTIONS

       --user		       authorized domain application server administrative username.

       --password	       password to administer the domain application server.

       --host		       machine name where the domain application server is running.

       --port		       port number of the domain application server listening for administration requests.

       --secure 	       if true, uses SSL/TLS to communicate with the domain application server.

       --passwordfile	       file containing the domain application server password.

       --terse		       indicates that any output data must be very concise, typically avoiding human-friendly sentences and favoring well-
			       formatted data for consumption by a script. Default is false.

       --echo		       setting to true will echo the command line statement on the standard output. Default is false.

       --interactive	       if set to true (default), only the required password options are prompted.

OPERANDS

       poolname 	       name of the connection pool to be tested.

       Example 1: Using ping-connection-pool

       Before you can ping a connection pool, you must:

	 o  Create a connection pool with authentication.

	 o  Make sure the Enterprise Information Server (can be the database) is started.

       asadmin> ping-connection-pool --user admin1 --password adminadmin1
       --host pigeon --port 5001 sampleConnectionPool
       Command ping-connection-pool executed successfully

EXIT STATUS

       0		       command executed successfully

       1		       error in executing the command

       asadmin-create-connector-connection-pool(1AS),  asadmin-delete-connector-connection-pool(1AS), asadmin-list-connector-connection-pool(1AS),
       asadmin-create-jdbc-connection-pool(1AS), asadmin-delete--jdbc-connection-pool(1AS)asadmin- list--jdbc-connection-pools(1AS)

J2EE 1.4 SDK							    March 2004					 asadmin-ping-connection-pool(1AS)
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