SmokePing (a network latency measurement tool) users list

Dobersberger Dieter | 2 Jan 2004 15:42

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no data for one host

Hi All,

I have a strange problem with smokeping (version 1.16):

My smokeping is set up so that about 15 hosts are graphed ok, but
there is a single host which has no data. Every few hours there shows
up a single red bar in the charts (meaning 19/20 packet loss) and then
there is more emptyness for a long time period again.

When I use ping or fping from the smokeping host command line to ping
the host all is fine, I get 0% PL and an average RTT of about 50ms:

$ fping -c 5 10.60.2.20
10.60.2.20 : [0], 84 bytes, 44.2 ms (44.2 avg, 0% loss)
10.60.2.20 : [1], 84 bytes, 44.2 ms (44.2 avg, 0% loss)
10.60.2.20 : [2], 84 bytes, 43.5 ms (44.0 avg, 0% loss)
10.60.2.20 : [3], 84 bytes, 42.9 ms (43.7 avg, 0% loss)
10.60.2.20 : [4], 84 bytes, 42.3 ms (43.4 avg, 0% loss)
10.60.2.20 : xmt/rcv/%loss = 5/5/0%, min/avg/max = 42.3/43.4/44.2

Anyone got an idea why smokeping is not graphing anything for a host
that is up and reachable from the smokeping machine ?

Thanks for reading this far, I hope someone can help.
best regards,
Dieter

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Arnold Nipper | 2 Jan 2004 20:16

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Re: no data for one host

Dobersberger Dieter wrote, On 02.01.2004 15:42:

> Hi All,
> 
> I have a strange problem with smokeping (version 1.16):
> 
> My smokeping is set up so that about 15 hosts are graphed ok, but
> there is a single host which has no data. Every few hours there shows
> up a single red bar in the charts (meaning 19/20 packet loss) and then
> there is more emptyness for a long time period again.
> 
> When I use ping or fping from the smokeping host command line to ping
> the host all is fine, I get 0% PL and an average RTT of about 50ms:
>
> 10.60.2.20 : xmt/rcv/%loss = 5/5/0%, min/avg/max = 42.3/43.4/44.2
> 
> Anyone got an idea why smokeping is not graphing anything for a host
> that is up and reachable from the smokeping machine ?
> 

Dieter,

what is "rrdtool fetch -s -1800 <<suspicious_host>>.rrd AVERAGE" telling 
you?

Arnold

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Dobersberger Dieter | 2 Jan 2004 22:41

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Re[2]: no data for one host

Friday, January 2, 2004, 8:16:46 PM, Arnold Nipper wrote:
>> I have a strange problem with smokeping (version 1.16):
>> 
>> My smokeping is set up so that about 15 hosts are graphed ok, but
>> there is a single host which has no data.

> what is "rrdtool fetch -s -1800 <<suspicious_host>>.rrd AVERAGE" telling 
> you?

Arnold,

thanks for your reply.

The output of the command you told me is:

                   uptime          loss        median         ping1         ping2         ping3         ping4         ping5         ping6         ping7         ping8         ping9        ping10        ping11        ping12        ping13       
ping14        ping15        ping16        ping17        ping18        ping19        ping20

1073077500: nan 2.0000000000e+01 nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan
1073077800: nan 2.0000000000e+01 nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan
1073078100: nan 2.0000000000e+01 nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan
1073078400: nan 2.0000000000e+01 nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan
1073078700: nan 2.0000000000e+01 nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan
1073079000: nan 2.0000000000e+01 nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan
1073079300: nan 2.0000000000e+01 nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan
1073079600: nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan nan

I hope it makes more sense to you than it makes to me ...

best regards,

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Arnold Nipper | 3 Jan 2004 02:31

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Re: no data for one host

Dobersberger Dieter wrote, On 02.01.2004 22:41:
>>> My smokeping is set up so that about 15 hosts are graphed ok, but
>>>  there is a single host which has no data.
> 
> 
>> what is "rrdtool fetch -s -1800 <<suspicious_host>>.rrd AVERAGE"
>> telling you?
> The output of the command you told me is:
> 
> uptime          loss        median         ping1         ping2
> ping3         ping4         ping5         ping6         ping7
> ping8         ping9        ping10        ping11        ping12
> ping13        ping14        ping15        ping16        ping17
> ping18        ping19        ping20
> 
> 1073077500: nan 2.0000000000e+01 nan nan nan nan nan nan nan nan nan
> nan nan nan nan nan nan nan nan nan nan nan nan

There really is no data (nan means "not a number") in the RRD. IMHO
that looks like a connectivity problem to <<suspicious_host>>. Are you
able to run a traceroute every 5min. when SmokePing is probing the host?

Arnold

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Dobersberger Dieter | 3 Jan 2004 03:53

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Re[2]: no data for one host

Saturday, January 3, 2004, 2:31:30 AM, Arnold Nipper wrote:
>> 1073077500: nan 2.0000000000e+01 nan nan nan nan nan nan nan nan nan
>> nan nan nan nan nan nan nan nan nan nan nan nan

> There really is no data (nan means "not a number") in the RRD. IMHO
> that looks like a connectivity problem to <<suspicious_host>>. Are you
> able to run a traceroute every 5min. when SmokePing is probing the host?

traceroute is blocked by a firewall guarding the <<suspicious_host>>.
But I am able to ping it from the command line. I let the ping run for
over 30 minutes and not a single packet was lost. I tried fping and
the "normal" ping that came with my Redhat 9. I also tried larger icmp
packets which worked too:

$ fping -b 1500 -c 5 10.60.2.20
10.60.2.20 : [0], 1528 bytes, 121 ms (121 avg, 0% loss)
10.60.2.20 : [1], 1528 bytes, 120 ms (121 avg, 0% loss)
10.60.2.20 : [2], 1528 bytes, 121 ms (121 avg, 0% loss)
10.60.2.20 : [3], 1528 bytes, 120 ms (121 avg, 0% loss)
10.60.2.20 : [4], 1528 bytes, 142 ms (125 avg, 0% loss)
10.60.2.20 : xmt/rcv/%loss = 5/5/0%, min/avg/max = 120/125/142

Is smokeping using any special flags for fping that might create icmp
packets that are dropped by the firewall in front of
<<suspicious_host>> ?

Dieter

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Arnold Nipper | 3 Jan 2004 04:09

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Re: no data for one host

Dobersberger Dieter wrote, On 03.01.2004 03:53:

> Is smokeping using any special flags for fping that might create icmp
> packets that are dropped by the firewall in front of
> <<suspicious_host>> ?
> 

Line 114 of FPing.pm suggest that smokeping uses

  fping -C #_of_pings -q -B1 -i10 -r1

Which host are you pinging?

Arnold

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Dobersberger Dieter | 3 Jan 2004 04:29

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Re[2]: no data for one host

Saturday, January 3, 2004, 4:09:21 AM, Arnold Nipper wrote:
> Dobersberger Dieter wrote, On 03.01.2004 03:53:

>> Is smokeping using any special flags for fping that might create icmp
>> packets that are dropped by the firewall in front of
>> <<suspicious_host>> ?
>> 

> Line 114 of FPing.pm suggest that smokeping uses
>   fping -C #_of_pings -q -B1 -i10 -r1
> Which host are you pinging?

If I start this command from the shell it seems to work:

$ fping -C 5 -q -B1 -i10 -r1 10.60.2.20
10.60.2.20 : 43.73 38.77 40.73 38.99 38.71

The target host is a Windows XP SP1 with all resent patches from
winupdate.

Dieter

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Tobias Oetiker | 8 Jan 2004 00:56

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Smokeping 1.25 is out

Folks,

I have released smokeping 1.25. It is available from

http://people.ee.ethz.ch/~oetiker/webtools/smokeping/pub

2004/01/04 -- 1.25
* enhaced Alert patterns: S for matching at startup
  *X* pattern for timeshift matches. See docs. -- Tobi
* Added timeout option the EchoPingHttp -- Tobi
* fixed RemoteFPing probe -- Keith Patton

2003/10/05 -- 1.24
* The new --filter option allows you to run the smokeping deamon on a big config file,
  but have the config file filtered and only measure the entries that pass
  the filter. This allows to use rsync to consolidate measurements from
  different hosts at a central location for presentation. -- Tobi
* new lookup option for DNS probe -- "Poetzel, Christopher J." <cpoetzel <at> anl.gov>
* store iaxhight info in img cache -- Curtis Doty <Curtis <at> GreenKey.net>
* new probes: ICMP echo response times - CiscoRTTMonEchoICMP.pm,
  DNS query response times - CiscoRTTMonDNS.pm,
  TCP connect times - CiscoRTTMonTcpConnect.pm  -- joerg.kummer at roche.com

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Dmitry Melekhov | 8 Jan 2004 05:47

alert mail to several addresses

Hello!

Is it possible to send mail to several addresses without creating mail 
aliases?
Thank you!

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Ralf Hildebrandt | 8 Jan 2004 11:52

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gaps in the graph

Hi!
We've been using smokeping successfully for quite some time now, but
there's one thing on our mind:

There are gaps in the graphs. These gaps correlate between all
targets. Is there a way to find out what exactly the problem is?

Find attached two images

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