The transmit queue length is to small for WAN based transfers for 10 + Gb network Lengths.
<Ethernet device>: is the name of the WAN Ethernet device like eth0, en0 or p4p1
<Size>: this should be set to 10000 for 10 and 40Gb Ethernet devices
this should be done for each Ethernet device to be used.
Add to the bottom of rc.local /etc/rc.local
#Science-DMZ transmit queue length tuning
/sbin/ifconfig <Ethernet device> txqueuelen <Size>