Trouble with OpenWrt - no DNS in new router

Installing and Using OpenWrt
1

I'm feeling stupid. I am trying to configure a new OpenWrt router to replace an older OpenWrt device.

My connection to the internet is through a LTE bridge - my cell phone carrier provided a gizmo with an Ethernet port that is in bridge mode. It assigns a DHCP address of 10.19.x.x (through their CGNAT) to the router's WAN port.

The older OpenWrt device works just fine. My memory is that I used substantially the default configuration, then plugged it into the LTE Bridge. The WAN port got a DHCP address, and I was able to connect, finish configuration, and smile.

This new device (ArcherC7v2, flashed with 21.02.1) connects to the LTE Bridge, gets the correct DHCP address, but "nothing works". More specifically:

  • I can ping public IP addresses (8.8.8.8, 4.2.2.1, and others addresses that I have memorized) Curiously, my cell carrier doesn't seem to be passing traffic for 1.1.1.1, so I won't use that for a DNS server.

  • No DNS lookups work. nslookup from the command line of the router fails.

    root:~# nslookup gstatic.com 4.2.2.1
;; connection timed out; no servers could be reached

  • In Network -> DHCP & DNS, I have

    • set DNS Forwardings to 8.8.8.8 and 4.2.2.1

  • in Network -> WAN settings, I have

    • UNchecked the "Use DNS servers advertised by peers"
    • Use custom DNS servers of 8.8.8.8 and 4.2.2.1

What am I missing? Many thanks.

2

try faking your old router's Wan mac to your new router mac. Some ISPs lock to that mac and require a call to release it. by faking it you can rule that out.

(edit - Is the new router using the same VLAN for connection?)

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3

Bingo! That seems to have made the difference. Thanks!

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4

Its an old cable modem trick. Glad it still works. And its usually faster than trying to call your ISP.

5

Yeah. I had to do it with my DSL provider as well.

At least they redirected everything to a "Walled Garden" webpage (they actually called it that) that said, essentially, you gotta call us before you can get on the air... Thanks again.

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