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
PROTECTED]
cc:
Subject:Re: TNSPING VS. REGULAR PING..! WHY SUCH A DIFFERENCE
I agree that this difference might be only because sqlnet is much more
fat that ICMP.
But anyway, could some overhead be added be because the failover load
balancing clauses that require extra
I agree that this difference might be only because
sqlnet is much more "fat" that ICMP.
But anyway, could some overhead be added be because
the failover load balancing clauses that require extra work?
Also, if listener logs every connection, this might
add some extra IO time as well (if
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
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
TNSping uses the Port 1521 to communicate .. Not Sure which Port Ping
will use..
HTH
Regards,
Ganesh R
HP : (+65)9067-8474
Mail : [EMAIL PROTECTED]
==
All Opinions expressed are my own and do
not in anyway reflect those of my employer
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
Mark is right,
Ping uses ICMP Echo_Request and Echo_Response. Since ICMP sit on the
Network Layer along with ARP and the IP protocols, it does not need to
use any TCP or UDP port number. TCP and UDP protocols need a number to
differentiate from the rest of protocols, therefore the expression port
Murali Vallath [EMAIL PROTECTED] 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
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
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