==== run-tcpbench6-3-1 ====
rm -f nc.log
nc -6 -v -l -V 41 fc00:0:0:1::41 12345 >/dev/null 2>nc.log &
# Wait until nc is listening.
for  i in `jot 30`; do if fgrep -q Listening nc.log; then break; fi; sleep .1; done
fgrep Listening nc.log
Listening on fc00:0:0:1::41 12345
# Test that path MTU dicovery is working.
tcpbench -6 -t 5 -V 43 -b fc00::43 fc00:0:0:1::41
  elapsed_ms          bytes         mbps   bwidth 
        1000      177785424     1422.283  100.00% 
Conn:   1 Mbps:     1422.283 Peak Mbps:     1422.283 Avg Mbps:     1422.283
        2001      196038680     1566.743  100.00% 
Conn:   1 Mbps:     1566.743 Peak Mbps:     1566.743 Avg Mbps:     1566.743
        3002      184732536     1477.860  100.00% 
Conn:   1 Mbps:     1477.860 Peak Mbps:     1566.743 Avg Mbps:     1477.860
        4004      207184760     1654.170  100.00% 
Conn:   1 Mbps:     1654.170 Peak Mbps:     1654.170 Avg Mbps:     1654.170
        5004      207052928     1656.423  100.00% 
Conn:   1 Mbps:     1656.423 Peak Mbps:     1656.423 Avg Mbps:     1656.423
--- fc00:0:0:1::41 tcpbench statistics ---
1173103288 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1422.283/1555.496/1656.423/93.619 Mbps
# path MTU discovery in other rtable does not work in ip6_output()
/sbin/route -T 43 -n get -host -inet6 fc00:0:0:1::41
   route to: fc00:0:0:1::41
destination: fc00::
       mask: ffff:ffff:ffff::
    gateway: ::1
  interface: lo43
 if address: ::1
   priority: 8 (static)
      flags: <UP,GATEWAY,DONE,STATIC>
     use       mtu    expire
      39     32768         0 
DISABLED