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'''More Info:''' MTU is negotiated upon connection. We usually like 1500 MTU, however, there can be situations where forcing 1492 MTU is required. For example, if your router negotiated 1500 MTU initially but you make a connection to a server that wants to re-negotiate a lower MTU it will try to do this using ICMP, but if your router has a miss-configuredmisconfigured firewall that blocks ICMP this can't be re-negotiatedrenegotiated and the connection to the server will have problems. This is seen when connecting to certain web sites, bank web sites and https sites. Forcing 1492 MTU from the start means that all your traffic is in packets of 1492 bytes and so won't have this problem.