Author: James E Harvey
Posted: 2010-03-02 17:29:11 Link
Our network recently started to experience problems with speed over the
internet. The COMCAST SMC device would also be inaccessible due to an error
message stating "Access error: data follows, can't get memory".
We re-boot the SMC and access speeds are back to normal and the SMC is
accessible. After a period of time (30 min to 1 1/2 hr) we're back to the
bad behavior.
Comcast stated that the SMC was "not locking properly". They then used ping
somehow to determine the speed was poor, had us pull the network cable and
announced that the ping was now fine, so according to them the problem is on
our end.
My question is, is there any free software that will "find" which device is
going bad and sending out bad packets, if that is the problem?
James E Harvey
Hanover Shoe Farms, Inc.
M.I.S./Corresponding Officer
Off: 717-637-8931
fax: 717-637-6766
email: jharvey@hanoverpa.com
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Author: Jarvis, Matthew
Posted: 2010-03-02 17:49:29 Link
> -----Original Message-----
> From: profoxtech-bounces@leafe.com
[mailto:profoxtech-bounces@leafe.com]
> On Behalf Of James E Harvey
> Sent: Tuesday, March 02, 2010 2:29 PM
> To: profoxtech@leafe.com
> Subject: [NF] network traffic software (free preferable)
>
>
> My question is, is there any free software that will "find" which
device
> is
> going bad and sending out bad packets, if that is the problem?
>
The most dreaded words in IT: "the network is slow".... talk about
time-suck trying to track this one down.... ;)
If it isn't an intermittent thing i.e. when it gets bad, it STAYS bad,
you have a shot at tracking it down with free tools you already have:
tracert and ping.
First tracert to the router and get the list of IP addy's.
Then from you desktop, ping up the chain waiting to see slow times. It
helps if you can telnet/connect to the devices in line between you and
the router to help narrow/confirm your search.
It would be nice if you could do the tracert/ping test when the thing is
acting correctly to get a benchmark.
Thanks,
Matthew Jarvis || Business Systems Analyst
IT Department
McKenzie-Willamette Medical Center
1460 G Street, Springfield, OR 97477 || Ph: 541-744-6092 || Fax:
541-744-6145
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Author: Paul McNett
Posted: 2010-03-02 18:13:13 Link
On 3/2/10 2:49 PM, Jarvis, Matthew wrote:
>> -----Original Message-----
>> From: profoxtech-bounces@leafe.com
> [mailto:profoxtech-bounces@leafe.com]
>> On Behalf Of James E Harvey
>> Sent: Tuesday, March 02, 2010 2:29 PM
>> To: profoxtech@leafe.com
>> Subject: [NF] network traffic software (free preferable)
>>
>>
>> My question is, is there any free software that will "find" which
> device
>> is
>> going bad and sending out bad packets, if that is the problem?
>>
>
> The most dreaded words in IT: "the network is slow".... talk about
> time-suck trying to track this one down.... ;)
>
> If it isn't an intermittent thing i.e. when it gets bad, it STAYS bad,
> you have a shot at tracking it down with free tools you already have:
> tracert and ping.
>
> First tracert to the router and get the list of IP addy's.
>
> Then from you desktop, ping up the chain waiting to see slow times. It
> helps if you can telnet/connect to the devices in line between you and
> the router to help narrow/confirm your search.
>
> It would be nice if you could do the tracert/ping test when the thing is
> acting correctly to get a benchmark.
I like to ping flood each device to see which stop responding under load. Obviously,
do this when users aren't trying to work. I don't think Windows ping has the -f
switch, but you could boot a Linux live distro, sudo to root, and then:
ping -f <hostname>
Here's the output pinging my server (server is in Southern California; I'm in Central
California) - I'm on a Mac:
bash-3.2# ping -f paulmcnett.com
PING paulmcnett.com (208.70.74.99): 56 data bytes
..............................^C
--- paulmcnett.com ping statistics ---
5172 packets transmitted, 5142 packets received, 0% packet loss
round-trip min/avg/max/stddev = 23.894/26.981/59.256/3.437 ms
bash-3.2#
This was about 10 seconds of flooding. I like how it gives good stats at the end
including not just average but standard deviation. If you see wildly different
numbers for min and max on your local network for some device and not others, that
device could be the culprit.
I've had a few switches cause huge network lags. If the switch isn't managed (doesn't
have an ip of its own to ping) then you'll have to use trial and error. One of my
switches would work for a couple days and then totally hang. When I finally figured
out which switch this was, I took it out back and beat it with a baseball bat.
Paul
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Author: Ed Leafe
Posted: 2010-03-02 20:05:05 Link
On Mar 2, 2010, at 6:13 PM, Paul McNett wrote:
> Here's the output pinging my server (server is in Southern California; I'm in Central
> California) - I'm on a Mac:
>
> bash-3.2# ping -f paulmcnett.com
> PING paulmcnett.com (208.70.74.99): 56 data bytes
> ..............................^C
> --- paulmcnett.com ping statistics ---
> 5172 packets transmitted, 5142 packets received, 0% packet loss
> round-trip min/avg/max/stddev = 23.894/26.981/59.256/3.437 ms
> bash-3.2#
FWIW, ping -f on a Mac usually requires sudo.
-- Ed Leafe
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Author: Paul McNett
Posted: 2010-03-02 20:24:42 Link
On 3/2/10 5:05 PM, Ed Leafe wrote:
> On Mar 2, 2010, at 6:13 PM, Paul McNett wrote:
>
>> Here's the output pinging my server (server is in Southern California; I'm in Central
>> California) - I'm on a Mac:
>>
>> bash-3.2# ping -f paulmcnett.com
>> PING paulmcnett.com (208.70.74.99): 56 data bytes
>> ..............................^C
>> --- paulmcnett.com ping statistics ---
>> 5172 packets transmitted, 5142 packets received, 0% packet loss
>> round-trip min/avg/max/stddev = 23.894/26.981/59.256/3.437 ms
>> bash-3.2#
>
> FWIW, ping -f on a Mac usually requires sudo.
Same with Linux. In my example above, I was already root so I didn't need the sudo.
Paul
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Author: Alan Bourke
Posted: 2010-03-03 03:56:57 Link
Have a Google for WireShark
--
Alan Bourke
alanpbourke (at) fastmail (dot) fm
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Author: <kamcginnis@gmail.com>
Posted: 2010-03-03 11:21:34 Link
I can't pass up this opportunity to throw a jab at comcast. Once I thought that PacBell was the worst communication
company but Comcast proved they were the winner of that title. I was on the SF peninsula at that time.
Back to your note, I am not sure if this will be of any value, but because of so much trouble like you describe, we now
have the ISP set their device to 'bridge' mode. That way it won't cause any trouble. Then we connect something like a
SMC 7004 broadband router which is very easy to program and allows you to turn the ping response on and off, block
ports, DHCP, etc. You have control. At any time you can check the status of the SMC 7004 and see if you have an internet
connection and see a log of who connected when, illegal connection tries, etc.
----- Original Message -----
From: "James E Harvey" <jharvey@hanoverpa.com>
To: "'ProFox Email List'" <profox@leafe.com>
Sent: Tuesday, March 02, 2010 2:29 PM
Subject: [NF] network traffic software (free preferable)
Our network recently started to experience problems with speed over the
internet. The COMCAST SMC device would also be inaccessible due to an error
message stating "Access error: data follows, can't get memory".
We re-boot the SMC and access speeds are back to normal and the SMC is
accessible. After a period of time (30 min to 1 1/2 hr) we're back to the
bad behavior.
Comcast stated that the SMC was "not locking properly". They then used ping
somehow to determine the speed was poor, had us pull the network cable and
announced that the ping was now fine, so according to them the problem is on
our end.
My question is, is there any free software that will "find" which device is
going bad and sending out bad packets, if that is the problem?
James E Harvey
Hanover Shoe Farms, Inc.
M.I.S./Corresponding Officer
Off: 717-637-8931
fax: 717-637-6766
email: jharvey@hanoverpa.com
[excessive quoting removed by server]
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Author: James E Harvey
Posted: 2010-03-03 11:34:32 Link
They (Comcast tech support) suggested I purchase a "router" to install
between their SMC and our switch as they believed that all of a sudden the
SMC could no longer handle the routing requirements, and it was their
opinion we need a separate device to handle that job.
Based on their assumption I purchased a Linksys Cable/DSL/Router Model No.
BEFSR41.
Do you think this device will suffice?
In the meantime we think we have narrowed the problem down to one user's
computer. With it connected the SMC runs out of memory in about 20 - 30
minutes, without it connected the SMC has been good for about an hour so
far, and that is the results of two tests...
James E Harvey
Hanover Shoe Farms, Inc.
M.I.S./Corresponding Officer
Off: 717-637-8931
fax: 717-637-6766
email: jharvey@hanoverpa.com
-----Original Message-----
From: profox-bounces@leafe.com [mailto:profox-bounces@leafe.com] On Behalf
Of kamcginnis@gmail.com
Sent: Wednesday, March 03, 2010 11:22 AM
To: ProFox Email List
Subject: Re: [NF] network traffic software (free preferable)
I can't pass up this opportunity to throw a jab at comcast. Once I thought
that PacBell was the worst communication
company but Comcast proved they were the winner of that title. I was on the
SF peninsula at that time.
Back to your note, I am not sure if this will be of any value, but because
of so much trouble like you describe, we now
have the ISP set their device to 'bridge' mode. That way it won't cause any
trouble. Then we connect something like a
SMC 7004 broadband router which is very easy to program and allows you to
turn the ping response on and off, block
ports, DHCP, etc. You have control. At any time you can check the status of
the SMC 7004 and see if you have an internet
connection and see a log of who connected when, illegal connection tries,
etc.
----- Original Message -----
From: "James E Harvey" <jharvey@hanoverpa.com>
To: "'ProFox Email List'" <profox@leafe.com>
Sent: Tuesday, March 02, 2010 2:29 PM
Subject: [NF] network traffic software (free preferable)
Our network recently started to experience problems with speed over the
internet. The COMCAST SMC device would also be inaccessible due to an error
message stating "Access error: data follows, can't get memory".
We re-boot the SMC and access speeds are back to normal and the SMC is
accessible. After a period of time (30 min to 1 1/2 hr) we're back to the
bad behavior.
Comcast stated that the SMC was "not locking properly". They then used ping
somehow to determine the speed was poor, had us pull the network cable and
announced that the ping was now fine, so according to them the problem is on
our end.
My question is, is there any free software that will "find" which device is
going bad and sending out bad packets, if that is the problem?
James E Harvey
Hanover Shoe Farms, Inc.
M.I.S./Corresponding Officer
Off: 717-637-8931
fax: 717-637-6766
email: jharvey@hanoverpa.com
[excessive quoting removed by server]
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