[Nagios-users] monitoring external internet connectivity
All, What is the best way to check if our network has connection to commodity internet or not. What I am trying to achieve is to ensure internal network has connection to Internet. One thing is to ping google check. Is this a good idea or can someone suggest a better way to do this. Please advise on this. Thanks -- Cordially, Shadhin Rahman -- ___ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null
Re: [Nagios-users] monitoring external internet connectivity
On Jun 30, 2009, at 2:43 PM, shadih rahman wrote: All, What is the best way to check if our network has connection to commodity internet or not. What I am trying to achieve is to ensure internal network has connection to Internet. One thing is to ping google check. Is this a good idea or can someone suggest a better way to do this. It is never a good idea to steal the resources of some third party for your own purposes, no matter how infinite you think those resources to be. If you and hundreds, thousands or millions of other people all think it's just fine to ping Google all the time, Google takes the brunt of that resource hit. I would recommend that you poll your router's snmp tables to get interface status (ifStatus, ifOperStatus). Alternately, place a test device or purchase a small colo server somewhere outside your network that you can use as the target for your tests; or work with someone with similar needs to arrange permission to ping devices on each other's network. -- Marc -- ___ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null
Re: [Nagios-users] monitoring external internet connectivity
Shadhin, I had our nagios ping google.com for awhile, but if something happens to the DNS server internally then it gave a false reading saying the internet was down when it was a DNS issue. Eventually I figured I could ping my ISP's IP address instead of hostname, and that seemed to work well. Im sure a place like google has more than 1 ip address associated with it, so I would pick an external IP address of a known site/company and plug it in. I also have SMS enabled/setup on my nagios machine so that when the internal network is down, an SMS message is generated and sent to the techie phones. (can't get email if the network is down, eh?) Hope this helps, Jayson Broughton From: shadih rahman [mailto:shadhi...@gmail.com] Sent: Tuesday, June 30, 2009 1:44 PM To: nagios-users@lists.sourceforge.net Subject: [Nagios-users] monitoring external internet connectivity All, What is the best way to check if our network has connection to commodity internet or not. What I am trying to achieve is to ensure internal network has connection to Internet. One thing is to ping google check. Is this a good idea or can someone suggest a better way to do this. Please advise on this. Thanks -- Cordially, Shadhin Rahman The information in this electronic mail message and any attached files is confidential and may be legally privileged. If you are not the intended recipient, delete this message and contact the sender immediately. Access to this message by anyone other than its intended recipient is unauthorized. You must not use or disseminate this information as it is proprietary property of the True companies. Communications on or through the True companies' computer systems may be monitored or recorded to secure effective system operation and for other lawful purposes. Thank you.-- ___ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null
Re: [Nagios-users] monitoring external internet connectivity
I gotta 2nd Marc on that. We did get permission from our ISP to ping their network, as we are usually the first to know when one of our 28+ networks go down in the country :-) I too would get permission. Because if they don't know who you are, some attentive little admin at x site might see your possibly mis-configured nagios server as a DOS attack against their network and block you. Thus leaving you with a false response that your network is down :-) Or even if it's not mis-configured, having your server pinging their server at regular intervals might seem abit off to someone that's monitoring logs. Jayson -Original Message- From: Marc Powell [mailto:m...@ena.com] Sent: Tuesday, June 30, 2009 2:05 PM To: Nagios Users Mail-list Subject: Re: [Nagios-users] monitoring external internet connectivity On Jun 30, 2009, at 2:43 PM, shadih rahman wrote: All, What is the best way to check if our network has connection to commodity internet or not. What I am trying to achieve is to ensure internal network has connection to Internet. One thing is to ping google check. Is this a good idea or can someone suggest a better way to do this. It is never a good idea to steal the resources of some third party for your own purposes, no matter how infinite you think those resources to be. If you and hundreds, thousands or millions of other people all think it's just fine to ping Google all the time, Google takes the brunt of that resource hit. I would recommend that you poll your router's snmp tables to get interface status (ifStatus, ifOperStatus). Alternately, place a test device or purchase a small colo server somewhere outside your network that you can use as the target for your tests; or work with someone with similar needs to arrange permission to ping devices on each other's network. -- Marc -- ___ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null The information in this electronic mail message and any attached files is confidential and may be legally privileged. If you are not the intended recipient, delete this message and contact the sender immediately. Access to this message by anyone other than its intended recipient is unauthorized. You must not use or disseminate this information as it is proprietary property of the True companies. Communications on or through the True companies' computer systems may be monitored or recorded to secure effective system operation and for other lawful purposes. Thank you. -- ___ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null
Re: [Nagios-users] monitoring external internet connectivity
do you host your website internally? if not, ping that host and or do an HTTP check of it. one thing i highly recommend is using a small little VPS ($10/mo even) to do some basic monitoring. I use one personally for testing and to monitor my websites, friends websites, our email and dns services, etc. Also I use it to monitor our corporate Nagios servers as a sanity check. :-) -- Mat W. - http://www.techadre.com Date: Tue, 30 Jun 2009 15:43:57 -0400 From: shadhi...@gmail.com To: nagios-users@lists.sourceforge.net Subject: [Nagios-users] monitoring external internet connectivity All, What is the best way to check if our network has connection to commodity internet or not. What I am trying to achieve is to ensure internal network has connection to Internet. One thing is to ping google check. Is this a good idea or can someone suggest a better way to do this. Please advise on this. Thanks -- Cordially, Shadhin Rahman _ Lauren found her dream laptop. Find the PC that’s right for you. http://www.microsoft.com/windows/choosepc/?ocid=ftp_val_wl_290-- ___ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null
Re: [Nagios-users] monitoring external internet connectivity
shadih rahman wrote: All, What is the best way to check if our network has connection to commodity internet or not. What I am trying to achieve is to ensure internal network has connection to Internet. One thing is to ping google check. Is this a good idea or can someone suggest a better way to do this. Please advise on this. Thanks I created an extremely simple plugin that takes several hosts as argument and if one of them is up, Internet is considered to be up its available at http://git.op5.org/git/?p=nagios/op5plugins.git;a=blob_plain;f=check_internet.sh;hb=HEAD cheers Johannes -- Cordially, Shadhin Rahman -- ___ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null -- Johannes Dagemark CTO / VP Engineering op5 AB Första Långgatan 19 SE-413 27 Gothenburg cell: +46 733-70 90 24 fax: +46 31-774 04 32 Email: j...@op5.com http://www.op5.com/ -- ___ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null
