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The problem with suspected MTU/MSS is that it can cause packet fragmentation and communication issues between network devices. MTU (maximum transmission unit) refers to the maximum size of a single network packet that can be transmitted. MSS (maximum segment size) refers to the largest amount of data that can be transmitted in one TCP segment.

If the MTU/MSS settings are not optimized or the network devices have different settings, it can cause packet fragmentation or dropped packets. This can lead to slow network speeds, lost data, and other network issues.

The difficulty in fixing suspected MTU/MSS issues lies in identifying the root cause of the problem. It requires a deep understanding of the network infrastructure and the communication between devices. Additionally, fixing the issue may require adjusting the MTU/MSS settings on various devices, which can be time-consuming and complex.