DNS lookup occurs even with noconn
list Ford Alan
Hi all, I have databases and webpages in my hosts.cfg like this.. 0.0.0.0 Oracle_Enterprise_Manager # prefer noping noconn https://ictoem01.stanwell.com:7801/em/console # Obviously a web page 0.0.0.0 soapro # prefer noconn # This is an oracle database which I have tests sent to. What I find is that even with noconn, it still attempts to resolve the server name ie Oracle_Enterprise_Manager I have managed to fix this by modifying xymonnet.c on line 839 From this... if (!h->testip && (dnsmethod != IP_ONLY)) add_host_to_dns_queue(h->hostname); to this if (!h->testip && !h->noconn && (dnsmethod != IP_ONLY)) add_host_to_dns_queue(h->hostname); Any comments or possible breaking of Xymon?? If my interpretaion is what is expected for the noconn test maybe Henrik could put this in as a bug fix :) Thanks Alan Ford Senior Database Administrator Com Serv - Information Communications and Technology Stanwell Corporation Limited www.stanwell.com<http://www.stanwell.com>; This email is to be read subject to the email disclaimer located at http://www.stanwell.com/email-disclaimer.aspx
list Jeremy Laidman
What if you add "testip"?
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On Fri, May 11, 2012 at 10:21 AM, FORD Alan <user-eb925835b8b9@xymon.invalid> wrote:
Hi all,**** ** ** I have databases and webpages in my hosts.cfg like this..**** ** ** **0.0.0.0 ** Oracle_Enterprise_Manager # prefer noping noconn https://ictoem01.stanwell.com:7801/em/console # Obviously a web page**** **0.0.0.0 **soapro # prefer noconn # This is an oracle database which I have tests sent to.**** ** ** ** ** What I find is that even with noconn, it still attempts to resolve the server name ie Oracle_Enterprise_Manager**** ** ** I have managed to fix this by modifying xymonnet.c on line 839**** From this…**** ** ** if (!h->testip && (dnsmethod != IP_ONLY)) add_host_to_dns_queue(h->hostname);**** ** ** to this**** ** ** if (!h->testip && !h->noconn && (dnsmethod != IP_ONLY)) add_host_to_dns_queue(h->hostname);**** ** ** Any comments or possible breaking of Xymon??**** ** ** If my interpretaion is what is expected for the noconn test maybe Henrik
could put this in as a bug fix J****
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** **
Thanks****
* *
*Alan Ford*
*Senior Database Administrator*
*Com Serv - Information Communications and Technology*
*Stanwell Corporation Limited*
** **
www.stanwell.com****
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** ** This email is to be read subject to the email disclaimer located at http://www.stanwell.com/email-disclaimer.aspx
list Ford Alan
Hmm... Maybe. Will have to try it :) It would have to be something like this then 0.0.0.0 soapro # testip noconn Seems a bit counter intuitive... lol
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From: Jeremy Laidman [mailto:user-71895fb2e44c@xymon.invalid] Sent: Friday, 11 May 2012 3:49 PM To: FORD Alan Cc: xymon at xymon.com Subject: Re: [Xymon] DNS lookup occurs even with noconn What if you add "testip"? On Fri, May 11, 2012 at 10:21 AM, FORD Alan <user-eb925835b8b9@xymon.invalid<mailto:user-eb925835b8b9@xymon.invalid>> wrote: Hi all, I have databases and webpages in my hosts.cfg like this.. 0.0.0.0 Oracle_Enterprise_Manager # prefer noping noconn https://ictoem01.stanwell.com:7801/em/console # Obviously a web page 0.0.0.0 soapro # prefer noconn # This is an oracle database which I have tests sent to. What I find is that even with noconn, it still attempts to resolve the server name ie Oracle_Enterprise_Manager I have managed to fix this by modifying xymonnet.c on line 839 From this... if (!h->testip && (dnsmethod != IP_ONLY)) add_host_to_dns_queue(h->hostname); to this if (!h->testip && !h->noconn && (dnsmethod != IP_ONLY)) add_host_to_dns_queue(h->hostname); Any comments or possible breaking of Xymon?? If my interpretaion is what is expected for the noconn test maybe Henrik could put this in as a bug fix :) Thanks Alan Ford Senior Database Administrator Com Serv - Information Communications and Technology Stanwell Corporation Limited www.stanwell.com<http://www.stanwell.com>; This email is to be read subject to the email disclaimer located at http://www.stanwell.com/email-disclaimer.aspx
list Japheth Cleaver
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Hmm... Maybe. Will have to try it :) It would have to be something like this then 0.0.0.0 soapro # testip noconn Seems a bit counter intuitive... lol
Don't forget that xymon does more than just ping test (which is all
'noconn' modifies). There are a lot of scenarios where ICMP traffic is
blocked but you'll still be able to hit --thus, test-- port 80 or some
other service.
For those hosts, xymon still needs to be able to look up the IP address if
all it has is a name, so if you want to prevent lookup attempts on the
fake name you're going to need both tags.
Think of "testip" as "doesnotresolve"
HTH,
-jc
list Ford Alan
Ok I finally got round to testing it. To stop DNS lookup on a made up client name you need... 0.0.0.0 soapro # testip noconn Sweet!! Thanks all!!
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From: xymon-bounces at xymon.com [mailto:xymon-bounces at xymon.com] On Behalf Of FORD Alan Sent: Friday, 11 May 2012 3:58 PM To: 'Jeremy Laidman' Cc: xymon at xymon.com Subject: Re: [Xymon] DNS lookup occurs even with noconn Hmm... Maybe. Will have to try it :) It would have to be something like this then 0.0.0.0 soapro # testip noconn Seems a bit counter intuitive... lol From: Jeremy Laidman [mailto:user-71895fb2e44c@xymon.invalid] Sent: Friday, 11 May 2012 3:49 PM To: FORD Alan Cc: xymon at xymon.com<mailto:xymon at xymon.com> Subject: Re: [Xymon] DNS lookup occurs even with noconn What if you add "testip"? On Fri, May 11, 2012 at 10:21 AM, FORD Alan <user-eb925835b8b9@xymon.invalid<mailto:user-eb925835b8b9@xymon.invalid>> wrote: Hi all, I have databases and webpages in my hosts.cfg like this.. 0.0.0.0 Oracle_Enterprise_Manager # prefer noping noconn https://ictoem01.stanwell.com:7801/em/console # Obviously a web page 0.0.0.0 soapro # prefer noconn # This is an oracle database which I have tests sent to. What I find is that even with noconn, it still attempts to resolve the server name ie Oracle_Enterprise_Manager I have managed to fix this by modifying xymonnet.c on line 839 From this... if (!h->testip && (dnsmethod != IP_ONLY)) add_host_to_dns_queue(h->hostname); to this if (!h->testip && !h->noconn && (dnsmethod != IP_ONLY)) add_host_to_dns_queue(h->hostname); Any comments or possible breaking of Xymon?? If my interpretaion is what is expected for the noconn test maybe Henrik could put this in as a bug fix :) Thanks Alan Ford Senior Database Administrator Com Serv - Information Communications and Technology Stanwell Corporation Limited www.stanwell.com<http://www.stanwell.com>; This email is to be read subject to the email disclaimer located at http://www.stanwell.com/email-disclaimer.aspx