[c-nsp] MTU packet loss problem 12410 XR and 6509

[James Bensley]

Hi Lee,

I thought that with these 12400's the MTU setting must include
Ethernet headerss (Source, Destination and Ethertype is 14 bytes) so
its 1514 for a 1500 byte payload size plus headers. The 6500 is set to
1500 bytes because it adds 14 bytes on for the frame headers.

Cheers,
James.