LAN network problem -- Can't enable the router as DHCP Server

[Muse]

Disconnect dsl modem from wifi router and repeat your access nas test.
I am concered about your ipconfig not showing a gateway.

Just saw this. I'm going to have to set this stuff aside right now for the day and come back to it tomorrow, have priority stuff on my plate. I just got off the phone with my ISP support and told them I have access to my network from this ethernet connected machine but no access to internet or email. This is the machine I just assigned IP in TCP/IP configuration/properties and the same IP in router config. What fixed the internet access was resetting getting the IP address automatically in the TCP/IP configuration/properties. I left the assignment in router config. Going to hang this up for today and come back to it tomorrow. If you have any more ideas, please post them. Thanks for the help!

 

[Muse]

Update:

Busy, sick, plenty of issues to go around, I put my attention to this matter on a back burner.

Last night, I innocently went to update some data, crucial data that resides on my server, my Synology DS214play NAS.

Troubles ensued, big troubles. Firstly, I got a message that the data wasn't accessible. I get messages like that not infrequently, and I didn't stop to read the thing, just looked at it for a second or two to get the gist and did what usually works... restart my database application, Visual FoxPro 9.0. The app started with a message that tells me that it has a handle on the data (via WIFI), but then instead of proceding in a normal manner simply disappeared, vanished, kaput. Some troubleshooting revealed that this was happening from all my machines. Looking at my development files I saw where my opening screen (which never got to appear) had been changed when the problem began. That should not have happened. Nothing I did should have changed the opening screen files. I replaced them with backup files I had and the problem disappeared. OK.

Then I try to access my data again and get super long delays of up to 5 minutes waiting for the (Not Responding) Visual FoxPro 9.0. Instead of sitting on my hands for another 5 minutes (or who knows how long), I kill the process several times. This is the very problem that motivated me to start this thread (along with counseling in a thread elsewhere that my problem stemmed from network issues).

It was suggested (back near the end of 2016) that I might have more than one DHCP server, causing conflicts that could account for my occasional tremendous delays. I found out a few weeks ago that my modem (Comtrend CT-5072T) is actually a modem/router, but was assured that it's running in "bridge mode" so it is not acting as a router and is not acting as a DHCP server.

Rebooting my NAS last night (actually, early this morning was when this recent episode happened) did not help the problem. I then restarted my Asus RT-N66R wireless router, as well as the switch that attaches to it. The problem was gone!!

I looked up "can restarting your router fix network issues?" I got some pages and came upon some ideas, one being to upgrade the router firmware, the other to run 3rd party router firmware such as DD-WRT.

I upgraded the router firmware. I searched and found that indeed there is DD-WRT firmware for my Asus RT-N66R router.

Do I know for sure that the problem is rooted in the router? No, I don't, but I have reason to suspect it. If I get problems again I will look at changing the firmware to DD-WRT, which I ran before on my Buffalo WHR-HP-G54 802.11b/g wireless router.