@Scionergy I've used an Asus RT-AC68U and RT-AC86U with the 4582 and both have been and continue to be rock solid. At the present time I'm running the 4582 in Bridge mode with both routers connected and running. Thats been several weeks or months.
1. What model of the 4582 do you currently have, as shown on the product sticker at the back of the modem. There are at least two or three versions of the 4582, please indicate which model which is shown on the sticker as CODA-4582 XXXX. There are U versions, U 2A versions and probably one more I believe.
2. How close are the modem and router? There was a problem when the modems were first released where the cable tuner didn't have enough shielding to prevent EMI from the modems wifi transmitting antenna, but that was resolved by installing heavier shielding over the cable tuner. Now, its possible that even with that, if the modem and router were side by side that you could still end up with EMI issues with modem which could cause strange issues. My 4582 and 86U are at least 10 feet apart, maybe a little more, so, if your modem and router are side by side, please separate them to see what effect that has.
3. Also, try this. If you're only using one port on the back of the router, use the bottom port which is port #4. Kick the modem back into Gateway mode, log in and navigate to the Advanced .... Switch Setup tab. Disable ports 1 thru 3 and save the changes. Kick the modem back into Bridge mode, Basic .... Gateway Function ... disable the Residential Gateway Function. Save the changes.
4. Are you using IPV6 in the router? If so, consider disabling IPV6 for now as a test. If the router performance stabilizes, consider enabling IPV6 at a point in the future.
Can you log into the modem and check the Software (firmware) version that is indicated on the STATUS page. That page is displayed when you log into the modem. Please let me know what version is loaded.
Then, navigate to the STATUS .... DOCSIS WAN tab and copy the entire Downstream Overview table, all the way to the bottom right hand corner of the bottom OFDM/OFDMA section. Select or highlight that entire table area, right click .... Copy. Then in a post, right click .... Paste. That should paste in the table, as is shown in the modem's UI. I'd like to see the signal data just to see if there is any issue with the current levels.
Are you still using the RT-AC86U? If so, are you running stock Asuswrt for firmware or Merlin's Asuswrt for firmware?
@Scionergy ok, gotcha. That 7.1.1.32 version was the latest trial version. Were you registered for the trial firmware program? If so, you might want to update the modem's MAC address with @CommunityHelps or ask to have your name withdrawn from the program. At some point down the road, 7.1.1.xx will be loaded network wide. When that happens my advice is to reboot / restart the modem, and in the worst case, run a factory reset and set the modem up again from scratch. I found 7.1.1.30 to be very unstable immediately after it was loaded. After a swap back and forth between Bridge mode and Gateway mode and a modem reboot, the modem stabilized and the speedtest rates returned to normal.
I've used both 2.0.10.xxTx and 7.1.1.3x modem versions and haven't had any issues with either Asus router.
@Scionergy CODA-4782, very interesting. First I've seen that modem mentioned in the forum. That's a more recent, slightly advanced version compared to the 4582.
Don't clone the modem MAC address in the 86U, or any other router, for anyone reading this. You won't be able to connect to the internet if you do that. The Cable Modem Termination System (CMTS) probably locks out any duplicate MAC addresses that are attempting to register on your particular CMTS. I would suspect that the same occurs network wide. That's a security provision most likely running to prevent data theft on the network.
If you want to change your WAN IP address when the modem is in Bridge mode and the 86U is running your network, then in the 86U go to WAN .... INTERNET CONNECTION and clone a device MAC address from your network, or, enter a valid MAC address that wouldn't be a duplicate of any MAC addresses that might be connected to the CMTS. The IEEE runs the MAC address assignment and the MAC addresses are not continuous, so there are gaps that can be used to generate valid but unused MAC addresses.
I can't explain why you had such difficulty with the previous modem. My 4582 is no doubt older than the one you were using. I suspect that firmware version 7.1.1.32 might have had something to do with the problems, but, I don't know why that would have prevented the 86U from connecting. Any issues that I've seen with the 7.x version are with the modem performance itself, and that was only when the version was initially loaded. After the switch over between Bridge mode to Gateway to Bridge mode and a modem reboot, all was good.
Fwiw, here's the link to Hitrons web page for the 4782:
http://www.hitron-americas.com/product/coda-4782/
Here's the link to the 4782 datasheet from that page:
http://www.hitron-americas.com/wp-content/uploads/2018/04/CODA-4782_datasheet_2018-07-03.pdf
As for the invalid field, my guess is that the CMTS is issuing a field that is invalid for that modem. There might be some small differences in the firmware versions between the two modem, so, its possible that the invalid field alert is a byproduct of that difference.
Looking at the datasheet, the 4782 has channel bandwidths of 20/40/80/160 Mhz. Have a look at the 5 Ghz bandwidth selections to see if the 160 Mhz selection is available or if its been locked out and not visible. If it is visible, then there are only two 160 Mhz channels available in the 5 Ghz band, both of which Dynamic Frequency Selection channels (DFS), so you would have to enable DFS channels to take advantage of two of the 160 Mhz wide channels. Those two channels are shared with Airport Weather Radars, so if you're near an airport and the modem is running DFS channls, any detection of a radar system would cause the modem to switch to another channel. That can take several minutes until the modem is satisfied that it can run on the newly located channel. Now, if you're not anywhere near an airport, and you have devices that can actually use DFS channels, then with enough antenna on the device you could probably see 940 Mb/s or slightly higher on that connected device. So, that might be food for thought.
If you happen to run a VPN, then loading Merlin's Asuswrt might be an idea in order to run higher VPN rates. There are modifications that Merlin has made to improve VPN performance on the 86U. Fwiw, here the link to the SNBForum Merlin page:
https://www.snbforums.com/forums/asuswrt-merlin.42/
There's no good reason for the modem to give you a hard time for anything other than perhaps the D-Link router. There was an issue when the 4582 was first issued, where D-Link routers would not connect. That was due to something peculiar and specific to the D-Link routers where those routers did not and probably still do not follow the typical protocols that allow a router to connect/communicate with a modem. I had thought that was water under the bridge by now, maybe not??
Fwiw, with the 4582 in Bridge mode, users can connect two routers to the modem and those routers will be issued both IPV4 and IPV6 WAN addresses. Those addresses are separate and independent of each other, so, you can run two separate networks. The same should probably apply to the 4782. Connect a second router to the modem, power it up, wait for it to boot up, and then reboot the modem. After that modem reboot is complete, both routers should be up and running with their own WAN IP addresses.
If that doesn't work, disconnect the first router, connect the second router and power it up. Ensure that it has its own IPV4 (and IPV6 address if desired). Then once again, connect the first router to the modem, power it up, wait for it to boot up, and then reboot the modem. After that modem reboot is complete, both routers should be up and running with their own WAN IP addresses. You shouldn't have to do this, but, in the event that simply connecting the second router and then rebooting the modem doesn't work, this should achieve the aim.
Fwiw, Merlin's Asuswrt is built on the original Asuswrt, so the menu's look almost identical, but, there are enhancements here and there that have been made to improve the router's performance and usability.
Are you connecting the modem to the 86U via short commercially produced cable, or is there any house ethernet between the modem and 86U? How far apart are the modem and 86U?
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