Not sure who will use it, but I encountered it myself, because my home is a floating IP.
A software I installed can't detect that the ppp0 network card is an external network, so changing the name can trick him into successfully installing it.

1. File opening

vim /etc/ppp/peers/dsl-provider

2. Add ifname eth0 in the last line

plugin rp-pppoe.so
nic-ens3
ifname eth0