I switched from an old TP-Link router to a GL-Inet GL-MT3600BE.
On the old TP-Link, emule port forwarding worked fine – I had a High ID.
On the GL-MT3600BE, despite port forwarding in the router menu, the low ID remains.
Without port forwarding, it doesn't connect to servers at all, but with port forwarding, it connects, but with a Low ID.
The router has a rich menu and runs OpenWRT. I'm sure there's something else I need to change in the settings, but I'm not sure what.
Hmm it would be better readable if you don't use ``` tags.
it is difficult to know what a high id or low id means, maybe your tp-link had ipv6 active when your new router does not.
Ipv6 does not require portforwarding and makes it faster, it is possible that you maybe leaked ipv6 over to emule with the tp-link router?
Because the only reason why something is slower like you mentoin is because of network address translation, this would be theoretically the same on the tp-link, but not if ipv6 was standard enabled which is not default on the gl firmware.
It is also possible you enabled a service in your router which disabled hardware accerelation you want this to be on, then you need to turn off the conflicting function in the gl firmware most functions show a balloon warning that hardware accerelation gets disabled.