Getting IPv6 TCP statistics

Question

I am trying to monitor TCP segments sent/received.

With IPv4, this is easy: either using the (old) netstat -s command which gives

...
Tcp:
    ...
    53291 segments received
    37350 segments send out
    ...

However, I cannot find this information for IPv6. Using netstat -s -6 gives information about the IP6 packets, ICMP6, and UDP6, but it returns the exact same TCP information as the netstat -s command.

I cat'ed around in /proc/net and found /proc/net/snmp6 which appears to be where netstat -s -6 was getting its information, but that file has a distinct absence of TCP information.

Is TCP over IPv6 reported somewhere else?

Answer 1

The TCP statistics reported by netstat -s is the aggregation of TCP traffic over both IPv4 and IPv6. Which makes sense to me, since TCP is TCP, why should the underlying protocol matter? (Ok, I know about the change in the checksum field, necessitated by the different Layer 3 header.)