R7800 won't reconnect to modem unless modem is power cycled

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Joined: 11 Jan 2020
Posts: 1

PostPosted: Sat Jan 11, 2020 7:10    Post subject: R7800 won't reconnect to modem unless modem is power cycled Reply with quote
I wanted to see if anyone could offer some good advice regarding an issue I'm having with modem (Arris TM1602) and router mentioned in title.

Problem: If the router is ever reboot (manually or accidentally), it will not reconnect with the Arris modem. The R7800 continues to work perfectly fine locally, but won't gain internet access UNLESS the modem is power cycled. Once modem is power cycled, it resolves the issue.

This issue has persisted throughout my years of ownership with R7800 regardless of firmware version (Currently V1.0.2.6Cool.

On the router log, all I see is this (when I power cycle modem):

[Internet connected] IP address: 24.162.***.***, Friday, January 10, 2020 22:20:50

[Internet connected] IP address:, Friday, January 10, 2020 22:20:04

[Internet connected] IP address:, Friday, January 10, 2020 22:19:54

[Internet connected] IP address:, Friday, January 10, 2020 22:19:43

I've done all the normal stuff (factory reset, changing cables, etc). The only thing I haven't done is test a different modem. However, I don't think changing modems would be necessary as I recently tested DD-WRT V3 Beta (Build 40559) on my R7800 and while on DD-WRT this problem went away. While on DD-WRT firmware I can make changes to the router and reboot it a thousand times and it will reconnect to the internet every time without having to power cycle the modem.

It's got me wondering if there is some kind of option within the stock Netgear firmware that's causing this since the it performs exactly as it should on DD-WRT.

Any and all help is greatly appreciated.

Joined: 18 Mar 2014
Posts: 4657
Location: Netherlands

PostPosted: Sat Jan 11, 2020 7:20    Post subject: Reply with quote
This is the DDWRT and if I understand you correctly DDWRT is functioning correctly but the Netgear stock firmware is not, and your question is about the Netgear firmware?

Maybe ask in the Netgear forum?

Or just use DDWRT?

Install guide for the R7800 can be found at: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614

40599 is not a good build, see point 8 and 9.

Below some pointers which might help to get the best out of DDWRT and out of the forum:
1. Research your router, start with the supported devices wiki:
https://wiki.dd-wrt.com/wiki/index.php/Supported_Devices .
2. In the supported devices wiki you can see if your router is supported and what architecture your router has and if you are lucky also an install guide/wiki.
3. Post in the right forum, from the former step you can see if your router is Broadcom, Qualcomm/Atheros, Marvell or other, use that forum to post router specific questions, for networking questions post in the Advanced Networking forum and for other things in the General Questions forum.
4. When posting always state router model, build number and when applicable the Kernel version.
Describe your problem and how you think it can be solved.
Give as much detail as you can also provide your network setup if applicable.
For your Network setup, state what wiki you have used: https://wiki.dd-wrt.com/wiki/index.php/Linking_Routers
5. When posting pictures make sure the maximum width is not more than 600 pixels.
6. Do not hijack a thread, meaning do not post your own problem in someone else's thread. Just start your own thread. This so that it can be searched and found by others.
7. If your post is answered and your problem solved, mark your thread with [SOLVED] (the header of your first post).
8. Do NOT use the router database, builds can be found at:
All builds are beta including those from the router database.
9. Before uploading a new build to your router, research the build by looking in the build threads.
This is an example of a build thread for build 41686 for Broadcom routers:
Search build threads with the search function and search on build number.
10. Use the build threads from the former step to report success or problems.
11. For older Broadcom routers (Linksys WRT54 and E series) read the peacock thread although some of it is outdated: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=51486
Builds can be found in the Broadcom directory for Linux kernel 2.4, in Broadcom_K26 for Linux K2.6 and in Broadcom_K3X for Linux K3.X.
12. If you are sure you have discovered a bug, after asking and querying the forum, you can report a real bug in the bug tracker: https://svn.dd-wrt.com/
This is also the place where the commits/changes to the source are administrated.
13. Recommended reading:
14. If you are happy with DDWRT and want it to live on then donate:

Routers:Netgear R7800, Netgear R6400v1, Netgear R6400v2, Linksys EA6900 (XvortexCFE), Linksys E2000 (converted WRT320N), WRT54GS v1.
Install guide Linksys EA6900: http://www.dd-wrt.com/phpBB2/viewtopic.php?t=291230
OpenVPN Policy Based Routing guide: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=321686
Install guide R6400v2:http://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
OpenVPN Server Setup:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=318795
Install guide R7800: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Wireguard Setup guide:https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1183135
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