![Solved: Netgear Address Reservation - Invalid MAC Address [Workaround]](https://guide-images.cdn.ifixit.com/igi/qKmx6tuCcyNUJmIg.140x105)
Solved: Netgear Address Reservation - Invalid MAC Address [Workaround]
Alan Nishioka and one other contributor
Last updated on Oct 13, 2023
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Community-Contributed Guide
An awesome member of our community made this guide. It was not created by iFixit staff.
Introduction
Go to step 1 ↓Address Reservation is broken on several Netgear routers. Specifically Nighthawk R7900P with V1.4.4.94_1.3.56 firmware, but it doesn't work for other routers and firmware as well.
The problem is the front end JavaScript removes the colons from the MAC address, but the back end software requires the colons.
This guide was written for Firefox browser and the screenshots are from Firefox. Microsoft Edge works in a similar fashion.
Google Chrome requires using the console so you have to be comfortable with that. [Chrome only] label indicates the different steps required.
Apple Safari is similar to Chrome and requires using the console.
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Get Invalid MAC address error
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This populates the Network tab with a list of URLs accessed
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This is the POST that sends your request to the back end
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Select Edit and Resend
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[Chrome only] Menu doesn't have this option so select Copy as fetch instead.
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Click Send to POST request to back end
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[Chrome only] Paste command to console and edit command line to add colons. Press Enter to send POST from console.
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NB: Screen doesn't change when you press Send. But you don't get the error.
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Click LAN Setup to go to previous screen to see new reservation at the bottom of the page.
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![Solved: Netgear Address Reservation - Invalid MAC Address [Workaround], Press F12 to enter browser inspector: step 1, image 1 of 1](https://guide-images.cdn.ifixit.com/igi/6qFnc4i2PHPnRuo6.medium)
Ask FixBot
![Solved: Netgear Address Reservation - Invalid MAC Address [Workaround], Click Add to reserve IP address: step 2, image 1 of 1](https://guide-images.cdn.ifixit.com/igi/XKNJKlAM1BxohZwW.medium)
![Solved: Netgear Address Reservation - Invalid MAC Address [Workaround], Right-click reserv.cgi? to bring up context menu: step 3, image 1 of 1](https://guide-images.cdn.ifixit.com/igi/M5sLXOeQKYEqe55v.medium)
![Solved: Netgear Address Reservation - Invalid MAC Address [Workaround], Edit POST Body to add colons to MAC address: step 4, image 1 of 1](https://guide-images.cdn.ifixit.com/igi/HqjJKjbFcLNtY5gM.medium)
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16 Guide Comments
i hit send but nothing happened. dont see the address listed in the LAN setup. What am i missin?
Did you get any error?
Did you reload LAN setup? I don't see any change to the screen when I press send, but clicking LAN Setup shows the new reservation at the bottom of the page.
No i dont see any errors. I hit send it does a quick loading of something within the network console and nothing else happens. I refresh page and no change.
looks like i had to do something else than your instructions.. after I edit and send it and i found the entry in the network log file I right click again and selected open in new tab and it seemed to work that way. Thanks.
This worked for me! thanks so much!
