Using the Sniffer10G libpcap interface and tcpdump, is there a way to capture packets down to the nanosecond?

No, tcpdump and libpcap only allow for microsecond timestamps, not nanoseconds. Our Sniffer10G API would give you nanoseconds.

If you would like higher accuracy in timestamping, you would need to use timesource (hardware) timestamping mode, available with our 10G-PCIE2-8C2-2S-SYNC adapters. For more details, please read:

• Should I use a 10G-PCIE2-8C2-2S-SYNC adapter or a non-SYNC adapter for my timestamped application?

Related Note:

• How do I run Linux tcpdump with the Sniffer10G software?