The difference between the start port and the end port may not be greater than 255. : r/fritzbox
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AVM Fritz!Box 7490 review: Fritz!Box packs in everything but the kitchen sink - CNET
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AVM FRITZ!Box 7430 (VDSL/ADSL2+, WLAN N, 450 MBit/s , TK-Anlage & Voice over IP mit DECT-Basis, Mediaserver) geeignet für Deutschland: Amazon.de: Computer & Accessories
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AVM Fritz!Box 7490 review: Fritz!Box packs in everything but the kitchen sink - CNET