NETGEAR Nighthawk AX8 8 Stream Wi-Fi 6 DOCSIS 3.1 Cable Modem and Multi-Gigabit Router - Manual (Page 23)

Table 4. Common MTU sizes
Application MTU
The largest Ethernet packet size. This setting is typical for connections
that do not use VPN, and is the default value for NETGEAR routers,
adapters, and switches. 1500
Maximum size to use for pinging. (Larger packets are fragmented.) 1472
Used in some DHCP environments. 1468
Usable by AOL if you do not send or receive large email attachments,
for example. 1460
User Manual 23 Specify Your Internet Settings
Nighthawk AX8 AX6000 WiFI Cable Modem Router Model CAX80