On 10/31/2016 12:06 PM, Benjamin Franksen wrote:
> On 31.10.2016 16:51, Michael Davidsaver wrote:
>> On 10/31/2016 11:33 AM, Benjamin Franksen wrote:
>>> On 31.10.2016 15:30, Michael Davidsaver wrote:
>>>> On 10/31/2016 07:09 AM, Benjamin Franksen wrote:
>>> Anyway, this sort of problem (duplicate IP adresses) should be detected
>>> automatically by the network infrastructure IMO, and not left to be
>>> debugged by control system engineers after they lead to obscure CA
>>> connection failures.
>>
>> Oh, I completely agree! However, I've been bitten by this, so I know
>> that detection (or notification of detection) isn't 100%. I happened to
>> notice that the MAC in the arp cache was alternating between two values.
>
> Uargh. That would indeed be hard to detect automatically.
Now that I think about it, this is the idea of:
http://www.linuxcommand.org/man_pages/arpwatch8.html
>> some relevant links
>>
>> https://linux.die.net/man/8/arping
>>
>> http://ipwatchd.sf.net
>
> Thanks for the links. A colleague found a tool named arp-scan, which can
> be used to implement a simple test:
>
> franksen@tiber > sudo arp-scan -l | grep DUP:
> 193.149.12.195 00:06:71:33:00:d4 Softing AG (DUP: 2)
> 193.149.12.196 00:06:71:33:00:d4 Softing AG (DUP: 2)
>
> The tool is packaged in common distros (debian,ubuntu,fedora).
>
> I am currently in the process of trying to get this to run as a test
> script for icinga on all our control networks, so perhaps next time we
> will be warned earlier...
>
> Cheers
> Ben
>
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- References:
- CA connection problems between VxWorks and Windows Benjamin Franksen
- Re: CA connection problems between VxWorks and Windows Benjamin Franksen
- Re: CA connection problems between VxWorks and Windows Michael Davidsaver
- Re: CA connection problems between VxWorks and Windows Benjamin Franksen
- Re: CA connection problems between VxWorks and Windows Michael Davidsaver
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