$ netstat -s
ip:
        21879416 total packets received
        0 bad header checksums
        0 with bad IP version number
        0 with size smaller than minimum
        0 with data size < data length
        0 with header length < data size
        0 with data length < header length
        0 with unknown protocol
        0 with link layer broadcast addr but unicast IP addr
        0 fragments received
        0 fragments dropped (dup or out of space)
        0 fragments dropped after timeout
        0 packets reassembled
        0 packets forwarded
        4730 packets not forwardable
        0 no routes
        0 redirects sent
        0 system errors during input
        21874686 packets delivered
        22058749 total packets sent
        0 system errors during output
        0 packets fragmented
        0 packets not fragmentable
        0 fragments created
        0 PCBs failed connect due to bad source address
icmp:
        0 calls to icmp_error
        0 errors not generated because old message was icmp
        Output histogram:
                echo reply: 588
                echo: 28
        0 messages with bad code fields
        0 messages < minimum length
        0 bad checksums
        0 messages with bad length
        0 bad netmasks received
        Input histogram:
                echo reply: 28
                echo: 588
        588 message responses generated
        616 messages received
        616 messages sent
        0 messages not sent due to bad source address
        0 system errors during output
igmp:
        0 messages received
        0 messages received with too few bytes
        0 messages received with bad checksum
        0 membership queries received
        0 membership queries received with invalid field(s)
        0 membership reports received
        0 membership reports received with invalid field(s)
        0 membership reports received for groups to which we belong
        0 membership reports sent
        0 total packets sent
        0 output errors
tcp:
        22056572 packets sent
                22056536 packets used fast path
                20399099 data packets (1672139922 bytes)
                641 data packets (546447 bytes) retransmitted
                56738 ack-only packets (28961 delayed)
                0 URG only packets
                16 window probe packets
                1598492 window update packets
                1586 control packets
                        69 resets
        21712074 packets received
                2851244 acks (for 1672210416 bytes)
                22777 duplicate acks
                0 acks for unsent data
                18940013 packets (1470375583 bytes) received in-sequence
                0 completely duplicate packets (0 bytes)
                20574 packets with some dup. data (26697 bytes duped)
                42 out-of-order packets (14850 bytes)
                0 packets (0 bytes) of data after window
                0 window probes
                7141 window update packets
                0 packets received after close
                0 discarded for bad checksums
                0 discarded for bad header offset fields
                0 discarded because packet too short
                0 system errors encountered during processing
        765 connection requests
        161 connection accepts
        924 connections established (including accepts)
        1398 connections closed (including 8 drops)
        12 embryonic connections dropped
        0 failed connect and accept requests
        7 resets received while established
        1784835 segments updated rtt (of 1785338 attempts)
        296 retransmit timeouts
                1 connection dropped by rexmit timeout
        29 persist timeouts
                0 alloc failures caused reschedule
        191 keepalive timeouts
                191 keepalive probes sent
                0 connections dropped by keepalive
        18829133 segments predicted
        2604161 acks predicted
udp:
        0 incomplete headers
        0 bad data length fields
        0 bad checksums
        10196 bad ports (10196 were broadcast/multicast)
        1037 input packets delivered
        0 system errors during input
        1304 packets sent
        0 streams allocation failures