Need help with a bad DHCP issue!!!!

[KelvinW]

I have an Asus GT-AXE16000 running merlin firmware and when a device discovers an IP address the router offers one but then when it requests the IP it's a different IP address. The log looks like this.

Jan 23 16:12:37 dnsmasq-dhcp[20761]: DHCPDISCOVER(br0) 1c:ca:1c:02:89:a7

Jan 23 16:12:37 dnsmasq-dhcp[20761]: DHCPOFFER(br0) 192.168.1.63 1c:ca:1c:02:89:a7

Jan 23 16:12:37 dnsmasq-dhcp[20761]: DHCPREQUEST(br0) 100.62.177.83 1c:ca:1c:02:89:a7

Jan 23 16:12:37 dnsmasq-dhcp[20761]: DHCPNAK(br0) 100.62.177.83 1c:ca:1c:02:89:a7 wrong server-ID

The 100.62.177.83 IP is the same for every device.

 

[Tech9]

Could you please provide more details about your setup? Where is your router connected and how, what ISP, etc. What devices are requesting this IP address? It appears to be T-Mobile network IP. Something is definitely wrong, but perhaps not the DHCP server on your router.

 

[Ripshod]

Sounds like your Sprint/T-Mobile modem/router is in bridge mode and is serving your public IP to your router. How is your asus connected to it?

 

[BlueiPhone]

I have an Asus GT-AXE16000 running the current merlin firmware. I am connected to the internet using TMHI.
Everyone in my family is very happy with this configuation. Need more details on your setup and maybe add a signature too..

 

[JGrana]

I have a T-Mobile Sagemcomm Router. As far as I know, there is no way to set it to bridge mode.
The best you can do is turn off the WiFi radios. And this requires a script - can’t be done by the T-Mobile app.

I have the Sagemcomm conneced to the WAN port on an AX58U. Has it’s own SSID and different subnet.

Works fine.

 

[BlueiPhone]

There is a app called "HINT Control" that I run on my iPhone and it allows much more control of the T-Modem.
The App is Free. No need for scripts. You are correct this can't be done with the native T-Mobile App.

 

[JGrana]

HINT Control is a great app - anyone using T-Mobile 5G routers should have it.

I made a mini version that runs on Asuswrt-merlin. tmo.sh

I mainly use it for cases where the WAN speed drops to almost 0. Like evening when there are lots of mobile devices and home users keeping the radio towers busy.

I found that by rebooting the T-Mobile router, I could often get back to reasonable speeds - rather then waiting a few hours.

I have a small script that checks spdMerlin’s results and calls “tmo.sh reboot” if the download speed drops below 20 Mbit.
Works 90% of the time.
Of course, the reboot time of the Sagemcomm router is quite long.
(now I know where all those 8 bit microprocessors went from the 70’s. ;-)