What MTU size should I use for my internet connection?
The best MTU setting for NETGEAR equipment is typically the default value of 1500 bytes. Change the MTU size only if your ISP or NETGEAR technical support recommends it, or if you experience connectivity problems with specific applications. A common troubleshooting value is 1400.
From the official Netgear CAX80 Modem Router manual, page 21
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