ICMP Ping error: gethostbyname failed

Moriarty · Post by **Moriarty** » Fri Mar 07, 2008 6:40 pm

Hi folks,

Since I've upgraded to 0.8.7b about half of my Advanced Ping graphs are showing 100% packet loss. cacti.log is showing the following for each of the hosts this is happening with:

Code: Select all

03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22
03/07/2008 11:30:01 PM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for 10.255.193.22

All hosts have an IP addresses defined for their hostnames, no name resolution required.

These were all graphing fine for months pre-upgrade. I was on 0.8.6j using cactid before the upgrade to 0.8.7b and spined.

Anyone have any ideas on how to resolve this?

It'd be much appreciated.

Thanks.

Post by **TheWitness** » Sun Mar 09, 2008 9:50 am

Oh, that sucks. Let me take a second look at the code.

TheWitness

Post by **TheWitness** » Sun Mar 09, 2008 9:57 am

Change line 127 in lib/ping.php to the following and let's see what happens.

Code: Select all

$host_ip = trim(gethostbyname($this->host["hostname"]));

As far as I can tell, this function is so strait forward, that it has to be something related to PHP. Let's see though.

TheWitness

Moriarty · Post by **Moriarty** » Fri Mar 14, 2008 4:23 am

Hi TheWitness, thanks for the assistance

Changing that line had no appreciable difference, graphs are still at 100% loss with the same errors being logged to cacti.log.

I can't figure out what the difference is between the graphs which are still working normally and those that are showing 100% loss either :\

Moriarty · Post by **Moriarty** » Fri Mar 21, 2008 5:22 pm

.. heh, anyone alive?

This still has me totally stumped.

cgotstein · Post by **cgotstein** » Fri Mar 21, 2008 6:35 pm

I see a common thread here. We are both getting the same errors on hosts that are in the 10.255 subnet. Could this be the issue?

Moriarty · Post by **Moriarty** » Fri Mar 21, 2008 9:02 pm

cgotstein: now that you mention it, all my failed graphs are in the 10.255.0.0/16 subnet alright. All graphs not in that subnet are graphing fine.

Completely missed that, good catch

Looks like there's a bug somewhere along the line in resolving this subnet.

cgotstein · Post by **cgotstein** » Fri Mar 21, 2008 11:52 pm

As soon as i used an alternate ip address for those same devices, the errors went away. So i think we found the problem. My guess is that some routine isn't liking the fact that we are using a 255 in the ip address. Hopefully one of the developers can fix this.

Post by **gandalf** » Sat Mar 22, 2008 7:52 am

The error is known as http://bugs.cacti.net/view.php?id=1204
I've assigned it to me. The link already shows the code update, so if you're in a hurry, simple have a look
Reinhard

cgotstein · Post by **cgotstein** » Sat Mar 22, 2008 2:53 pm

This is what i did:

file: lib/ping.php

Find:
error in function is_ipaddress
foreach($octets as $octet) {
if(($octet < 0) || ($octet >= 255))

replace: if(($octet < 0) || ($octet >= 255))

with: if(($octet < 0) || ($octet > 255))

Seems to be working now. Hopefully that is the correct change.

Moriarty · Post by **Moriarty** » Sat Mar 22, 2008 3:51 pm

That's the one. Makes sense

Thanks gents, much appreciated.

chrisgapske · Post by **chrisgapske** » Mon Jun 08, 2009 8:30 am

06/08/2009 08:20:11 AM - CMDPHP: Poller[0] WARNING: ICMP Ping Error: gethostbyname failed for

Well this bug seems to be alive and well.

I am having the same problem as listed.

http://bugs.cacti.net/view.php?id=1204

I will request it to be reopened.

Cacti

ICMP Ping error: gethostbyname failed

ICMP Ping error: gethostbyname failed

It seems to be back

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