[Xymon] hosts.cfg "mutlihomed" tag broken?

[Gavin Stone-Tolcher]

> Is it "multihome" like you have here or is it "multihomed"?

Yes that extra “d” really does make a difference! I was using “multihome” in my hosts.cfg. My only excuse is I must not have had enough caffeine.
I also apologise for my inept attempts at interpreting c code ☹

> You could disable --statussenders. Or you could add dummy host entries with the alternate IP addresses.

Hmm, seems I misunderstand what “multihomed” is supposed to do. I thought it would allow a multihomed client to report in from more than one IP without the addition of said IPs to xymond “–status-senders”.

We have a quite a few multihomed windows systems where for some reason the default interface for transmission seems to randomly change.
The MS guys responsible for the systems don’t seem to be able to configure it them to come from the same IP reliably. This seems to particularly be the case if the IPs are on the same subnet and interface.
I just want the client tests to not turn purple when this happens and continue working. I point out that we are mainly still running the old BBNT client, slowly migrating to Powershell Xymon client.
I would prefer not disabling the “—status-senders” if at all possible. Maybe this is not possible?


Cheers,
Gavin Stone-Tolcher, IT Support Officer, Network Operations and Incident Response
Information Technology Services
The University of Queensland
Level 4, Prentice Building, St Lucia 4072
T: +61 7 334 66645, M: +61 401 140 838
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From: Jeremy Laidman [mailto:jlaidman at rebel-it.com.au]
Sent: Friday, 27 March 2015 6:37 AM
To: Gavin Stone-Tolcher
Cc: xymon at xymon.com
Subject: Re: [Xymon] hosts.cfg "mutlihomed" tag broken?


Gavin

I fear you may have misunderstood the purpose of multihomed. It only suppresses a log message. It doesn't override access restrictions imposed by running xymond with "--status-senders".

On 26 Mar 2015 2:54 pm, "Gavin Stone-Tolcher" <g.stone-tolcher at its.uq.edu.au<mailto:g.stone-tolcher at its.uq.edu.au>> wrote:

>           By default, Xymon will warn if it sees data for one host coming from different

The man page you quoted says "warn" not "reject".

> 169 xmh_item_key[XMH_FLAG_MULTIHOMED]      = "MULTIHOMED";

> Is that looking for “MULTIHOMED” in CAPS, not “multihomed” lowercase?

Yes. But elsewhere is code that parses the hosts.cfg file to find multihomed and then set MULTIHOMED.

> Also, should line 170 have "XMH_FLAG_MULTIHOMED" rather than "XMH_MULTIHOMED"

No because it's setting the item name not the item key.

Xymon will be using some forms of the name as internal variable names and environment variables and so they might not mean what you think they mean.

> Doing a xymondborad query against a host with “multihome” produces no result for that field:

Is it "multihome" like you have here or is it "multihomed"?

> xymon localhost "xymondboard host=pf-parkingguide.pf.uq.edu.au<http://pf-parkingguide.pf.uq.edu.au> fields=XMH_FLAG_MULTIHOMED"

I think this should work. What do you get from "xymongrep multihomed"? What do you get from your xymondboard command if you don't specify "fields=..."?

> This section in xymond.c from line 1520 seems to be the code doing a check that XMH_FLAG_MULTIHOMED is NULL:

Yep. And you'll notice that it all boils down to whether or not to run this line:

>                         log_multisrc(log, sender);

> Any ideas on this one? Currently I have to add multihomed hosts to “--status-senders” otherwise.

You could disable --statussenders. Or you could add dummy host entries with the alternate IP addresses.

J
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