Thu Dec 02, 2021 10:44 pm
Broadcast and network address is something used with regular subnets, but since PPPoE is point to point, it doesn't need any of that. And if you're assigning the first address to router, you're already breaking standard subnetting, because that would be network address. But again, I don't think it matters here. And if it works with the first one, then last one should work too. Anyway, that's just a detail, extra usable address would be simply nice bonus.
The important part is what PPPoE client does automatically and what's manual config. Can you share some info about that?
If I try quick test with both RouterOS client and server, I can route extra /30 (or any other) subnet to client, but using this subnet on client side is manual config. So if it's like that, you can either:
a) Use whole subnet on some internal interface, but that would give you only one usable address, because first would be network address, second would have router (as gateway for connected device), third one the device itself, and fourth would be broadcast.
b) Work with individual addresses. Assign any of them to router, use them as point to point addresses for directly connected devices (not everything supports that), route them to any connected device or another router in your network, anything.