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List:       opensuse
Subject:    Re: why did eth0 suddenly stop working? CLOSE to get solved...
From:       "Carlos E. R." <robin.listas () telefonica ! net>
Date:       2023-07-17 21:28:44
Message-ID: 290fdf8a-b7c6-0b01-9d36-294adff50beb () telefonica ! net
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On 2023-07-17 22:47, joe a wrote:
> On 7/17/2023 4:30 PM, Carlos E. R. wrote:
>> On 2023-07-17 18:10, Daniel Bauer wrote:
>>> Am 17.07.23 um 17:52 schrieb Freek de Kruijf:
>>>> Op maandag 17 juli 2023 17:40:42 CEST schreef Daniel Bauer:
>>>>> BUT:
>>>>>
>>>>> Switching the cable again to the laptop, the camera booted.
>>>>>
>>>> Where does the camera boot from? An internal resource or an external 
>>>> resource, like from your laptop.
>>>
>>> The cameras have their own web-interface that is reachable via their 
>>> IP with firefox (in my case).
>>>
>>>> During boot where does it get its IP address from? A DHCP server on 
>>>> your laptop?
>>>
>>> The cameras have a settings page, where (beneath a lot of other 
>>> things) their fixed IP is set.

...........************************

>>>
>>> The eth0 IP is set fixed ("manual" for IPv4 in Network manager 
>>> settings) on both the laptop and the pc, so there should be no DHCP.
>>>
>>>> Is there another outside resource needed when booting, which is not 
>>>> available.
>>>
>>> No. There is a "reset" (to factory default) button, and a "reboot" 
>>> button in the camera's web-interface. I think it does the reboot all 
>>> by itself.
>>>
>>> As much as I know everything is saved within the camera (settings are 
>>> the same, no matter from which computer I connect to them).
>>
>> Nevertheless, there is something the cameras want from the laptop, and 
>> if the laptop is not present, they stall.
>>
>> You could use "ethereal" or "tcdump" to log the connection of one 
>> camera to the laptop when you boot that camera.
>>
> 
> I've not read each and every post, but I suspect the cameras will turn 
> out to be set to obtain address via DHCP, the LAPTOP is enabled to 
> provide DHCP (as server) and the PC is not.

No, he said they are configured on fixed addresses.

> 
>> As your cameras and computer are on an isolated network, they can not 
>> get infected by malware, so you could disable the automatic boot.
>>
> 
> Not a sure bet. MALWARE can hitch a ride on removable media. "AIR GAP" 
> is not a panacea.

Common... it is Linux, and he is not daft.


-- 
Cheers / Saludos,

		Carlos E. R.
		(from 15.4 x86_64 at Telcontar)


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