This might sound incredibly simple, but we've seen this sort of thing
caused by a duplicate IP address. Sometimes it's faster to reboot the
InterMapper server than to wait for its ARP table to update. Check
the "system.log" file (in /Applications/Utilities/Console) for
messages from ARP:
Nov 30 08:51:48 BVIntermapper01 kernel[0]: arp: (omitted).1.194 moved
from 00:0a:95:37:82:0f to 00:19:e3:3d:3e:b8 on en0
Nov 30 09:11:50 BVIntermapper01 kernel[0]: arp: (omitted).1.194 moved
from 00:19:e3:3d:3e:b8 to 00:0a:95:37:82:0f on en0
The first line there shows that the machine that was living at .1.194
was replaced by a different machine; the second line shows the
original machine reclaiming its IP address.
Intermapper folks: it would be really cool if there was an option to
store the MAC address within a probe's Info screen. Then, optionally,
alert if the device's ARP record deviates from the MAC address on-file
with the InterMapper. Just something to think about. I'm sure that
those of us with big networks would be highly appreciative!! ;)
Ryan.
On Nov 28, 2007, at 4:06 PM, Jakob Peterhänsel wrote:
Dave,
At first, this sounded like the Router dropping SNMP traffic due to
load, (prioritize everything else) but as the problem is solved by
rebooting the IM server, that seems to not be the case.
I've had IM run on a low-end WinTel with XP on 512 MB RAM, and no
problems at all, monitoring 5000+ devices. This was on 4.0-4.5
versions, though...
Seems like you need to get in dialog with Dartware support on this..
Janet?
Best,
On 28/11/2007, at 00.55, Dave Stewart wrote:
Hi everyone!
I have an interesting observation I've been making recently and am
wondering if anyone else has an idea about this. We're running
Intermapper 4.6.4 (build 7A221) on a 1.42GHz G4 mini with 512MB RAM
and running OSX 10.4.11. I've occasionally noticed our map
complaining that our main router was bouncing (down/up) 10 times
within a half an hour and dropping 36% of it's packets, but no one
seems to notice a degradation on the network (everything seems
fine, network is definitely up and running). I can even ping the
router (in fact I can even ping *through* this router to public
servers) from this machine through one of these dropouts and my
ping tests don't lose even one packet. The map continues making
this claim until I restart the machine itself, then the complaints
go away and the router looks fine for roughly another week, when
the pattern repeats.
I've taken a look into the Intermapper detailed logs for network
events, but that doesn't reveal many surprises - it's logging the
router going down (usually for 24 or 27 seconds, occasionally 57
seconds) until the reboot, then the problem magically goes away.
Admittedly some of the logs are flashing by so quickly it's hard to
catch them all (it's a busy map:)), but I don't think it's
revealing *why* it's having a problem.
Interesting and revealing is the fact that it doesn't complain
about the routers at remote sites, which all end up going through
our main router to get to our server.
Anyone have any ideas what this could be? I'm starting to doubt
that I have a networking issue that no one has noticed yet and am
starting to think that Intermapper is having some issue it hasn't
had before. I haven't noticed any other symptoms on this machine
(nor have I noticed any issues with the network, which I would
since this is our main router), although it's not a very busy box
(Intermapper, secondary DNS and gathering some performance
characteristics from another server are it's only real functions).
Looking forward to investigating any ideas that come my way ...
Dave Stewart
Aqua~Flo Supply (Goleta CA)
dstewart at aquaflo dot com
"10 percent of computer users are Mac users,
but remember, we are the top 10 percent."
- Douglas Adams
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Jakob Peterhänsel
"Be a part of the Love Generation - carry a smile, not a gun."
- JP, May 2006
Email: [EMAIL PROTECTED]
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