Flint2 - Unable to access Synology NAS from 2,5Gb port

I solved my problem on my own. Here is the solution in case someone would have the same problem one day.

After some testing, I found that it is because I activated, long time ago, the jumbo frames on my Synology NAS (MTU 8000). I switched back to MTU 1500 and it works fine now, the NAS is reachable again from the 2,5Gb port. But I never had such problem with my previous router...

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