At 05:54 AM 12/23/2003 -0800, you wrote:
PING doesnt actually use a port number, as it's not TCP/IP based - it's a part of the ICMP protocol..
Mark
-----Original Message----- Ganesh Raja Sent: 23 December 2003 13:40 To: Multiple recipients of list ORACLE-L
TNSping uses the Port 1521 to communicate .. Not Sure which Port Ping will use..
HTH
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-----Original Message----- Mercadante, Thomas F Sent: Tuesday, December 23, 2003 20:54 PM To: Multiple recipients of list ORACLE-L
ANd one more thing about Ping vs Tnsping when going thru a firewall. Some firewalls are setup to not allow a Ping to pass thru, but sql connections are allowed. So a Ping will return not found, while a tnsping will return ok. I have that situation here all over the freakin place.
Tom Mercadante Oracle Certified Professional
-----Original Message----- Sent: Tuesday, December 23, 2003 5:54 AM To: Multiple recipients of list ORACLE-L
I came across just this last week with one of our monitoring tools. We set up an execution of a script that was using PING to check whether the status of a list of remote POS devices to make sure they were available. The collection worked fine - until we shutdown the POS device, and physically switched it off - and the PING still replied!
The POS devices have UPS built in to them.. The client also thought it may have been the way that DNS/DHCP was set up via the router. It stumped me for a time.. ;)
We use NETSVC now to check for the status of a service.
Mark
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-----Original Message----- Jared Still Sent: 23 December 2003 04:34 To: Multiple recipients of list ORACLE-L
Paul mentioned a few reasons for this.
Another is that a ping does not get past the NIC. The ping is answered by software running on the card. You may have noticed at times that a ping is not a reliable method for determining if a server is still functioning.
The OS can crash, but the NIC still responds to a ping.
Tnsping on the other hand must get a response from Oracle Net service or daemon running on the server, a much longer path as Paul pointed out.
HTH
Jared
On Mon, 2003-12-22 at 17:29, Murali Vallath wrote: > I have recently noticed in this one situation that there is a great difference between a tnsping vs a regular ping to the same server. > > for example this tnsping took about 270 ms which is strange and its consistent > > Used TNSNAMES adapter to resolve the alias > Attempting to contact (DESCRIPTION = (ADD > RESS_LIST = (load_balance = on) (failover = on) (ADDRESS = (PROTOCOL = TCP)(HOST > = myhost1.com)(PORT = 1521)) (ADDRESS = (PROTOCOL = TCP)(HOST = myhost2.com)( > PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = xyzdb) (FAILOVER_MODE = (TYPE > = SELECT) (METHOD = BASIC) (RETRIES = 20) (DELAY = 15)))) > OK (270 msec) > > and a ping to the same host > > Ping statistics for x.x.x.x: > Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate > round trip times in milli-seconds: > Minimum = 61ms, Maximum = 70ms, Average = 67ms > > Why could there be such a difference? > > > > > > > > --------------------------------- > Do you Yahoo!? > Yahoo! Photos - Get your photo on the big screen in Times Square
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