Re: how to find internet dead spots

[Paul Robert Marino]

hello
there are two tools that come to mind first is ntop you will find it in EPEL
its a great tool that will tell you what the network traffic is doing
and has a nice web GUI.

another great tool is smoke ping http://oss.oetiker.ch/smokeping/
there is no RPM for it that I know of but it is an easy way to test
your connectivity and graph your latency and it even does email
alerting.

On Wed, Mar 27, 2013 at 3:36 PM, Todd And Margo Chester
 wrote:
> Hi All,
>
> I have a Cent OS 5.x server sitting on a DSL line
> acting as a firewall.  I have noticed that there are
> dead spots, up to a minute, every so often in their
> Internet service.
>
> It could be a storm on someone's part, but the worst
> they run is IMAP.  No music; no video.
>
> Is there a utility I can run to map this?
>
> Many thanks,
> -T

Re: how to find internet dead spots

[Joseph Areeda]

Hi Todd,

If you mean the dsl goes out for a while, what I've done is pretty low 
tech but works for reporting downtime.


A cron job from inside that pings a couple of servers on the outside and 
one on the outside that pings the server in question.  I usually grep 
for the summary line and redirect it out to a log file.


Soemthing like:

   #!/bin/bash
   ips="example.com  another.example.com "
   for ip in $ips; do
dat=`date +"%Y%m%d %H%M"`
res=`ping -c 3 $ip | grep loss| awk '{print $6, ",", $10 }'`
echo $dat "," $ip "," $res >>/home/joe/ping.stats
   done

Joe


On 3/27/13 12:36 PM, Todd And Margo Chester wrote:


Hi All,

I have a Cent OS 5.x server sitting on a DSL line
acting as a firewall.  I have noticed that there are
dead spots, up to a minute, every so often in their
Internet service.

It could be a storm on someone's part, but the worst
they run is IMAP.  No music; no video.

Is there a utility I can run to map this?

Many thanks,
-T

xxx

how to find internet dead spots

[Todd And Margo Chester]

Hi All,

I have a Cent OS 5.x server sitting on a DSL line
acting as a firewall.  I have noticed that there are
dead spots, up to a minute, every so often in their
Internet service.

It could be a storm on someone's part, but the worst
they run is IMAP.  No music; no video.

Is there a utility I can run to map this?

Many thanks,
-T