RE: [nv-l] Netmon on NT
2003-12-04 09:04:32
Isn't
the 20 coded as 10ths of a second = 2 seconds? 1000 milliseconds (1 second)
would be a long ping time even in a serial 56K network.
20
seconds for a ping time out is an eternity. And remember with SNMP polling,
failure on a first attempt will result in doubling the timeout value the second
attempt and doubling the timeout again on a third try ad nauseum. I don't know
if the ICMP timeout is doubled each retry with pinging but I know it is for
SNMP
Timeouts depend on the
device or more so the speed of the connection you would have been the device
and NetView. I would consider 20 seconds to be too long a timeout for most
ethernet devices. Generally speaking the default is satifactory - how long
would you think it takes for a ping to make it to it's destination and back
again - try it on the command line. Double it to be sage if you like, but 20
seconds would make for a slooooooow network. Of course if you are monitoring
devices on the other end of a 64k serial (eg. dial-up) link, then maybe
not.
Ping spray has nothing to do
with community names. A ping spray is only used during discovery and is
basically a series of ping tests of every valid IP address in a given subnet
where it listens for responses as a means of learning of a devices existance.
Usually netmon only pings IPs it has learnt about from the route tables (and
other lists) from devices it has already discovered and has successfully SNMP
polled. netmon can also learn of other devices via a seedfile, its own arp
cache, or its own default route.
Gareth Holl Staff Software
Engineer gholl AT us.ibm DOT com
IBM Software Group - Tivoli
Brand Research Triangle Park, North Carolina.
| "Christopher J Petrina"
<cjp8 AT meadwestvaco DOT com> Sent by: owner-nv-l AT lists.us.ibm DOT com
12/03/2003 06:23 PM Please respond to nv-l
| To:
nv-l AT lists.us.ibm DOT com cc:
Subject: Re: [nv-l] Netmon on
NT |
WOuld you consider 20 seconds for 1st timeout fairly long to keep
them in there. with snmp setup properly. We are not using Ping
Spray. Is Ping Spray more practical when we are not exactly sure of all
the community strings on all the devices?
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