Wrong max down-/upstream values for LAN1 connected Fritz!Box

[mcktr]

Maximum downstream: OK - Max Downstream: 0.00 Mbit/s | 'downstream_max'=0.001024;;;;
Maximum upstream:   OK - Max Upstream: 0.10 Mbit/s | 'upstream_max'=0.099999;;;;

refs #97

[hoeni]

My Fritzbox 7590 is connected on the WAN port but has the same problem:

FritzBox GUI says: ​↓ 360,0 Mbit/s ↑ 120,0 Mbit/s,

check_fritz says:
OK - Max Downstream: 0.00 Mbit/s | 'downstream_max'=0.000000;;;;
OK - Max Upstream: 0.00 Mbit/s | 'upstream_max'=0.000000;;;;

[geotekberlin]

I have switched over from check_tr64_fritz and everything works as expected, except the usable/max upstream and downstream rate is always 0 for all DSL Fritzboxes. These two checks seem to work only on Fritzbox Cable boxes.