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Re: [lwip-users] dhcp_release_and_stop() clears the assigned IP address
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address@hidden |
Subject: |
Re: [lwip-users] dhcp_release_and_stop() clears the assigned IP address |
Date: |
Wed, 13 Feb 2019 22:25:23 +0100 |
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Am 13.02.2019 um 22:17 schrieb R. Diez:
[...]
No, a private scanning tool using broadcasts...
By private you mean not open sourced here?
In any case, how can this tool help? If the device is not getting any IP
address over DHCP, and they do not have any fall-back IP, then they are not
reachable. Or do you mean the devices reset their IP address when they receive
a particular? That does not seem very robust. How do you implement security
then? And the users needs a custom tool, because I assume that this is not a
standard solution.
Yes, a custom tool is required. That's the downside. There are
standardized protocols for "niches" like Profinet, however.
What fallback IP is that?
[...]
The user enters an appropriate fall-back IP during device commissioning, next to the
"enable DHCP" option. No need to panic or assume anything nasty.
Ehrm, how do you reach the device for commissioning? Via DHCP or via
fallback-IP? ;-)
So if the user has to enter an IP address, why use DHCP?
Even if all devices have the same fall-back IP, that does not really matter, as
long as it is on a different subnet
or it is a reserved IP for that purpose.
It does. You'll get bogus result trying to reach such devices.
>Networks should still operate correctly if a client device IP is
duplicated.
Network yes. IP communication won't.
>
If the DHCP server is down, and the devices need it, you have bigger
problems anyway. The fall-back IP is mainly designed so that you can
easily isolate a device and access it with a minimum of fuss.
That's what AutoIP was invented for...
Regards,
Simon
- [lwip-users] dhcp_release_and_stop() clears the assigned IP address, R. Diez, 2019/02/13
- Re: [lwip-users] dhcp_release_and_stop() clears the assigned IP address, R. Diez, 2019/02/13
- Re: [lwip-users] dhcp_release_and_stop() clears the assigned IP address, address@hidden, 2019/02/13
- Re: [lwip-users] dhcp_release_and_stop() clears the assigned IP address, R. Diez, 2019/02/13
- Re: [lwip-users] dhcp_release_and_stop() clears the assigned IP address, address@hidden, 2019/02/13
- Re: [lwip-users] dhcp_release_and_stop() clears the assigned IP address, R. Diez, 2019/02/13
- Re: [lwip-users] dhcp_release_and_stop() clears the assigned IP address,
address@hidden <=
- Re: [lwip-users] dhcp_release_and_stop() clears the assigned IP address, R. Diez, 2019/02/14
- Re: [lwip-users] dhcp_release_and_stop() clears the assigned IP address, Simon Goldschmidt, 2019/02/14