I have a Netgear Wndr3700, running an old version of LEDE.
It's connected to my ISP via another box in bridge mode (French Freebox v5)
WAN speed (measured from a computer in the LAN) is about 14Mb/s
I'm trying to replace it with a Xiaomi Mi 3G (OpenWrt 19.07.3)
Unfortunately, WAN speed get very slow (~4Mb/s) when I do so.
The curious point is that, if I connect my computer to the Mi 3G and the Mi 3G to the Wndr3700 (with different lans for each router), speeds are good again.
To sum up :
Computer->Wndr3700->ISP : 14Mb/s
Computer->Mi3G->ISP : 4Mb/s
Computer->Mi3G->Wndr3700->ISP : 14Mb/s
I suspect some mis-negotiation of a parameter between the Mi3G and my ISP's box, but I don't see which one (output from ip link and ip address are almost identical between the two routers)
Any ideas ? Any parameter I could check to spot the difference between the two routers ?
edit: forgot to mention, everything is done on rj45, wifi is not involved here...