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Knowledge document #432
FRITZ!Box 7490
This support document is available for the following products:
- FRITZ!Box 7690
- FRITZ!Box 7590 AX
- FRITZ!Box 7590
- FRITZ!Box 7583 VDSL
- FRITZ!Box 7583
- FRITZ!Box 7582
- FRITZ!Box 7581
- FRITZ!Box 7560
- FRITZ!Box 7530 AX
- FRITZ!Box 7530
- FRITZ!Box 7520
- FRITZ!Box 7510
- FRITZ!Box 7430
- FRITZ!Box 7390
- FRITZ!Box 7360
- FRITZ!Box 6890 LTE
- FRITZ!Box 6850 5G
- FRITZ!Box 6850 LTE
- FRITZ!Box 6840 LTE
Manually adjusting the MTU size for DSL connections
The FRITZ!Box does not offer the option to manually adjust the MTU size (Maximum Transmission Unit), i.e. to manually set the maximum size of user data that can be transmitted in a single data packet.
Manually adjusting the MTU size is also not necessary because the FRITZ!Box supports MSS clamping (Maximum Segment Size) that automatically adjusts the size of the data packets to the smaller MTU of the interconnected networks.
This means that there will be no performance loss due to the fragmenting or discarding of data packets.
Note:The maximum MTU is 1492 bytes for DSL connections established via PPPoE (Point to Point Protocol over Ethernet). The internet service provider can reduce the MTU by using additional protocols.