> diag hardware deviceinfo nic "interface name"
for example
> diag hardware deviceinfo nic wan1
produces the following sample output. Very handy to check for duplex mismatches, collisions, errors, etc in a pinch.
Driver Name: NP2
Version: 0.92
Chip Revision: 2
BoardSN: N/A
Module Name: 310B
DDR Size: 256 MB
Bootstrap ID: 11
PCIX-64bit-@133MHz bus: 03:01.0
Admin: up
Link: up
Speed: 1000Mbps
Duplex: Full
Rx Pkts: 3875403410
Tx Pkts: 3337050564
Rx Bytes: 1095981056
Tx Bytes: 1043256285
MAC0 Rx Errors: 0
MAC0 Rx Dropped: 0
MAC0 Tx Dropped: 0
MAC0 FIFO Overflow: 0
MAC0 IP Error: 0
TAE Entry Used: 0
TSE Entry Used: 0
Host Dropped: 1477715
Shaper Dropped: 121
EEI0 Dropped: 0
EEI1 Dropped: 0
EEI2 Dropped: 0
EEI3 Dropped: 0
IPSEC QFIFO Dropped: 0
IPSEC DFIFO Dropped: 0
PBA: 123/1019/251
Forwarding Entry Used: 0
Offload IPSEC Antireplay ENC Status: Disable
Offload IPSEC Antireplay DEC Status: Enable
Offload Host IPSEC Traffic: Disable