Solved RT-AX68U Pro trying to reserve IP address my results

[dmako]

While I did search and found various answers nothing quite fit the bill so allow me to ask.

ASUS RT-AX86U Pro, Firmware 3.0.0.6.102_34336
I am trying to reserve my printers IP address so that it never changes. Going through the steps as outlined on the ASUS site.
LAN, DHCP, Manual assignment set to Yes
Scroll through list and pick my Brother printer (on Wi-Fi)
Press the + to add it
Hit Apply

Router goes through configration, then my other Wi-Fi devices like TV, phone, etc. all go offline. Waited a bit but none return.
Remove the manual assigned printer and un-check manual assigment for printer, hit apply and all my other devices reconnect and are good to go.

What did I do wrong? Manual IPs must be outside of IP pool? Just buggy ASUS firmware? Other?
My laptop was wired to router and that may have saved me if all Wi-Fi access was removed, but not sure.

 

[bennor]

ASUS RT-AX86U Pro, Firmware 3.0.0.6.102_34336

FYI you should change your thread title to indicate you have a RT-AX86U Pro. The RT-AX68U is a completely different router than the RT-AX86U Pro.

Often on my RT-AX86U Pro, when making a change in the router GUI that affects Wireless clients the WiFi signal drops for a period of time before it comes back up. For the 5Ghz it can be as long as 5 minutes due to the use of 160GHz. Its a known issue that the DFS will cause a delay in the 5Ghz coming back online when it is enabled.

[Wireless Router] What is DFS (Dynamic Frequency Selection) and how does it work on ASUS router? | Official Support | ASUS

Beyond that no issues with manual assignments for a number of WiFi devices including an HP Officejet printer.

Is the printer on the main LAN WiFi or on a Guest Network Pro WiFi entry?

It may help if you post a screen shot of your settings for others to review. Redacting any sensitive information as needed from the screenshot.

 

[Tech9]

Other?

Most network printers have the option for static IP in settings. I have 2x wirelessly connected printers set this way.

 

[dmako]

FYI you should change your thread title to indicate you have a RT-AX86U Pro. The RT-AX68U is a completely different router than the RT-AX86U Pro.

Often on my RT-AX86U Pro, when making a change in the router GUI that affects Wireless clients the WiFi signal drops for a period of time before it comes back up. For the 5Ghz it can be as long as 5 minutes due to the use of 160GHz. Its a known issue that the DFS will cause a delay in the 5Ghz coming back online when it is enabled.

[Wireless Router] What is DFS (Dynamic Frequency Selection) and how does it work on ASUS router? | Official Support | ASUS

Beyond that no issues with manual assignments for a number of WiFi devices including an HP Officejet printer.

Is the printer on the main LAN WiFi or on a Guest Network Pro WiFi entry?

It may help if you post a screen shot of your settings for others to review. Redacting any sensitive information as needed from the screenshot.

Thanks
The printer is on the main lan. I'll have an opportunity to test again tomorrow. I'll give it a few more minutes to recover.

I just would assume the IP would be removed from the list to reassign an IP address.

 

[OzarkEdge]

What did I do wrong? Manual IPs must be outside of IP pool?

I find that ASUS DHCP assigns the same IP address to the same device repeatedly, although I have not checked this for mobile devices using randomized MAC addresses (which I don't care about).

All IPs assigned by the router should be within the DHCP IP Pool... only exclude static IPs you assign on client devices.

To use the router DHCP to manually assign an IP, I would enter the client MAC address, not select the client name since the router is notorious for inaccurate client lists/details.

With printers, the old school static IP assigned on the printer may be best... always seems most reliable for particular printer drivers. But try the router assignment first, if you want. And throw in a router reboot, if necessary to restart from scratch.

As for your WiFi cutting out, try waiting for it to return before tearing things down too soon.

OE

 

[dmako]

I find that ASUS DHCP assigns the same IP address to the same device repeatedly, although I have not checked this for mobile devices using randomized MAC addresses (which I don't care about).

All IPs assigned by the router should be within the DHCP IP Pool... only exclude static IPs you assign on client devices.

To use the router DHCP to manually assign an IP, I would enter the client MAC address, not select the client name since the router is notorious for inaccurate client lists/details.

With printers, the old school static IP assigned on the printer may be best... always seems most reliable for particular printer drivers. But try the router assignment first, if you want. And throw in a router reboot, if necessary to restart from scratch.

As for your WiFi cutting out, try waiting for it to return before tearing things down too soon.

OE

Yes when I select the printer (Brother) the MAC and IP address is populated in the list.
Then + then apply.

Just shocked when everything went offline for ~1-2 minutes.
My old TP router just took the setting and went about it business.

 

[Tech9]

Stock Asuswrt restarts the whole stack on DHCP server changes, all devices have to reconnect in result. This is normal and expected behaviour.

 

[dmako]

Stock Asuswrt restarts the whole stack on DHCP server changes, all devices have to reconnect in result. This is normal and expected behaviour.

Understood so all should simply reconnect i.e. I don't have to manually reconnect each device, right?

 

[OzarkEdge]

Understood so all should simply reconnect i.e. I don't have to manually reconnect each device, right?

Clients should reconnect automatically unless they are configured to not do so... some client wireless adapter drivers have this control, like on a Windows PC, but most will just reconnect.

OE

 

[bbunge]

As a couple of the old hands have said, set a static IP address at the printer. What I do is to change the LAN/DHCP Server/IP Pool Starting address to 192.168.50.30. This allows me addresses from 192.168.50.2 to 192.168.50.29 to assign to devices I want to have a constant IP address such as printers, cameras, NAS, managed switches, Pi-Hole and etc. The beauty of this is should you ever have to reset the router or change the router out you only need to set the IP Pool Starting address and not add manual reservations for several or more clients.
Try it...you will like it!

 

[dmako]

As a couple of the old hands have said, set a static IP address at the printer. What I do is to change the LAN/DHCP Server/IP Pool Starting address to 192.168.50.30. This allows me addresses from 192.168.50.2 to 192.168.50.29 to assign to devices I want to have a constant IP address such as printers, cameras, NAS, managed switches, Pi-Hole and etc. The beauty of this is should you ever have to reset the router or change the router out you only need to set the IP Pool Starting address and not add manual reservations for several or more clients.
Try it...you will like it!

If I can, had the printer for awhile. I did a quick search in the PDF manual and no hits for IP. Thus not sure if one can.

Found out how I can set printer's IP. Seems to be the best way.

 

[OzarkEdge]

Found out how I can set printer's IP. Seems to be the best way.

Be sure to exclude that static IP from the router's DHCP IP Pool.

OE

 

[Tech9]

Be sure to exclude that static IP from the router's DHCP IP Pool.

The advice is correct in general, but not needed with Asuswrt. It allows static IPs inside and outside DHCP pool.

 

[bbunge]

The advice is correct in general, but not needed with Asuswrt. It allows static IPs inside and outside DHCP pool.

Mmmm... not sure if that is so. Manually assigned IP's yes. Inside or outside of DHCP pool. Static IP's... not too sure..not good networking practice anyway.

 

[Tech9]

Mmmm... not sure if that is so.

I'm 100% sure. Tested. Home device, made for convenience. Doesn't necessarily follow best practices.

OH
(Old Hand)

 

[ColinTaylor]

Be sure to exclude that static IP from the router's DHCP IP Pool.

The advice is correct in general, but not needed with Asuswrt. It allows static IPs inside and outside DHCP pool.

I think you are confusing manually assigned (i.e. reserved) DHCP addresses with a statically defined address on the client. The OP stated he is doing the later. Therefore that address needs to be outside of the router's DHCP pool to prevent the router from giving that address to another client. Alternatively he could create a duplicate (i.e. fake) assignment for that static IP address in DHCP. That would also prevent another client getting that address by mistake. He would then have to remember to update the router's entry should he ever change the static IP address on the device.

 

[OzarkEdge]

Paraphrasing Eric's advice here... the router DHCP server IP Pool should include its dynamic and manually-assigned/reserved IPs assigned by the router, and exclude static IPs assigned by the user on the client device. This remains my practice.

What may confuse any testing is that the router DHCP always seems to dynamically assign the same IP to the same client device... which is handy... I use Windows shortcuts to browse certain network clients and have never bothered to assign them static IPs... except for a network printer, that one gets a static IP to keep its driver trouble-free.

I avoid using router manually-assigned/reserved IPs to not have to re-enter them after resetting the router configuration ad nauseam.

OE

 

[dmako]

Okay changed the beginning available pool address from .2 to .5 providing me 3 address for static assignment. Next set printer's IP in the range of .2-.4.
Then since Linux client CUPS to new address. Should be good to go and Learning!

 

[bbunge]

Okay changed the beginning available pool address from .2 to .5 providing me 3 address for static assignment. Next set printer's IP in the range of .2-.4.
Then since Linux client CUPS to new address. Should be good to go and Learning!

Always good to learn...

Your Linux client should have auto detected the "new" printer IP address. But, it was OK to manually add it. WIndows clients may have to be changed as, I feel, Windows is not as smart as Linux or OSX.

 

[dmako]

Always good to learn...

Your Linux client should have auto detected the "new" printer IP address. But, it was OK to manually add it. WIndows clients may have to be changed as, I feel, Windows is not as smart as Linux or OSX.

Yes linux does detect, my bad. It's the Brother driver that requires you tell it the IP address.