IPSEC / VTI / one site public IP & one site PPPOE WAN?

[chienchou.pan]

HI Sirs,

     Is any possible to use IPSEC Vti mode (route based) by one site public IP and the other site PPPoe WAN IP(or dymanic IP)? 
     I tried the setup for the two site both public IP is OK, but when I change the one site public IP and the other site PPPoe WAN IP is failed. The IPSEC status was green, but the two site network could't be connected

[mimugmail]

I think there was a limitation for reboots when using dyndns as IPsec trys to resolve the name when it's not online yet. Maybe it's more stable to let the modem dialin and use plain ethernet on OPNsense