Post Reset DHCP Reservation Restore

[Weblee2407]

I don’t mind a factory reset because I have a little process to recover most of my settings. In order to have a life past ‘home IT guy’ I use dhcp reservations to ease my troubleshooting as we have 32 devices always on and about 37 when everything is in use. Does anyone have a process to backup and then restore dhcp reservations?
setting so many devices is a big time hole.

 

[RMerlin]

What router? What firmware version?

DHCP reservations are stored in a file in some of the newer models, so you can just backup and restore that file as needed.

Older models will require to go through the nvram userspace tool, which may have length limitations however.

 

[bennor]

Does anyone have a process to backup and then restore dhcp reservations?

Yes. See the YazDHCP add-on.

YazDHCP - YazDHCP - feature expansion of DHCP assignments (increasing limit on the number of DHCP reservations)

v1.0.6 Updated 2023-11-18 Feature expansion of DHCP assignments using AsusWRT-Merlin's Addons API to read and write DHCP assignments, increasing the limit on the number of reservations. YazDHCP is free to use under the GNU General Public License version 3 (GPL 3.0). This project is hosted on...

www.snbforums.com

GitHub - jackyaz/YazDHCP: Feature expansion of DHCP assignments using AsusWRT-Merlin's Addons API to read and write DHCP assignments, increasing the limit on the number of reservations.

Feature expansion of DHCP assignments using AsusWRT-Merlin's Addons API to read and write DHCP assignments, increasing the limit on the number of reservations. - jackyaz/YazDHCP

github.com

 

[Weblee2407]

Geez I new that!
ASUS Gt-ax6000 Merlin 386.7_2

 

[Weblee2407]

Geez I new that!
ASUS Gt-ax6000 Merlin 386.7_2

That I should have known to add my device info that is

 

[RMerlin]

In that case, you can copy the content of /jffs/nvram/dhcp_staticlist .

 

[Weblee2407]

Well I can reset without scheduling now that I have YazDHCP. Donation coming for sure! This is the greatest thing since sliced cheese.

 

[FernandoF]

DHCP reservations are stored in a file in some of the newer models, so you can just backup and restore that file as needed.

In that case, you can copy the content of /jffs/nvram/dhcp_staticlist .

For my RT-AC86U (currently on 386.7_2), after a reset, I've been manually setting the dhcp_staticlist and custom_clientlist nvram variables with saved strings, committing, and rebooting.

May I ask whether restoring the corresponding /jffs/nvram files instead, as described above, also requires a reboot? Is there a preferred method?

Thanks in advance.

 

[RMerlin]

May I ask whether restoring the corresponding /jffs/nvram files instead, as described above, also requires a reboot? Is there a preferred method?

No need to reboot. For DHCP reservations, simplest method is to copy the file, then go to the DHCP staticlist page, and hit apply to trigger a dnsmasq restart. You could also issue a "restart service_dnsmasq" command. Note that already connected devices won't get a new lease until theirs expire, or you force them to reconnect.

 

[Yota]

Sometimes their order of commands can be a real headache, especially when managing a network of multiple different systems.
This service restart_dnsmasq is for Asuswrt and Asuswrt-Merlin

 

[TheLyppardMan]

Is it still the case that with my ASUS RT-AX86U Pro, I would need to save and restore the following files after a full factory reset if not using YazDHCP?

Also, which is the better method to use?