DDNS IP different from whatismyipaddress IP leads to wg problem

Installing and Using OpenWrt Network and Wireless Configuration
22

Not on Ryanair!
Just a check on the basic network layout: the Huawei 4g router is 192.168.0.1, 192.168.0.100 is mapped via Mac address to the OpenWrt router with that used as the static wan address. The OpenWrt LAN is 192.168.3.1 which is what I put in the wireguard app DNS field. Is there an obvious mistake in this?

23

Back now, here is the output of ifconfig eth0.1 whic looks OK

root@OpenWrt:~# ifconfig eth0.1
eth0.1    Link encap:Ethernet  HWaddr BC:AE:C5:C4:B2:A7
          inet addr:192.168.0.100  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fd48:3fe9:fba1:3700:beae:c5ff:fec4:b2a7/64 Scope:Global
          inet6 addr: fe80::beae:c5ff:fec4:b2a7/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:23720 errors:0 dropped:3114 overruns:0 frame:0
          TX packets:4089 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:4315723 (4.1 MiB)  TX bytes:704816 (688.2 KiB)

I think I'll update to 18.06.04 and start with a blank slate!