Asan si Hannah?
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
>
>Regards,
>Ganesh R
>HP : (+65)9067-8474
>Mail : ganesh.raja_at_logicacmg.com
>
>
>==========================================
>All Opinions expressed are my own and do
>not in anyway reflect those of my employer
>==========================================
>
>
>-----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
>
>===================================================
> Mark Leith | T: +44 (0)1905 330 281
> Sales & Marketing | F: +44 (0)870 127 5283
> Cool Tools UK Ltd | E: mark_at_cool-tools.co.uk
>===================================================
> http://www.cool-tools.co.uk
> Maximising throughput & performance
>
>
>
>-----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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Received on Mon Dec 29 2003 - 09:14:25 CST
