That limit is placed at the network level. There is no way to override it. The only way to change that would be to increase the MTU settings of the servers and the network devices between the servers. An MTU of 1500 is standard across all network devices and usully shouldn’t be changed.
Odds are your SQL Servers disk configuration will be the bottleneck, not the network.
This tip over at SearchSQLServer.com covers a lot of disk configuration options.