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
number" which translates into an OS network service.
Julio Cesar Quijada-Reina
Programmer Analyst
Computer Services at Alfred State College
-----Original Message-----
Mark Leith
Sent: Tuesday, December 23, 2003 8:54 AM
To: Multiple recipients of list ORACLE-L
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 : [EMAIL PROTECTED]
==========================================
All Opinions expressed are my own and do
not in anyway reflect those of my employer
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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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