==== 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 
        1003      164018392     1308.222  100.00% 
Conn:   1 Mbps:     1308.222 Peak Mbps:     1308.222 Avg Mbps:     1308.222
        2003      203356584     1626.853  100.00% 
Conn:   1 Mbps:     1626.853 Peak Mbps:     1626.853 Avg Mbps:     1626.853
        3004      202332200     1618.658  100.00% 
Conn:   1 Mbps:     1618.658 Peak Mbps:     1626.853 Avg Mbps:     1618.658
        4006      217274000     1734.723  100.00% 
Conn:   1 Mbps:     1734.723 Peak Mbps:     1734.723 Avg Mbps:     1734.723
        5007      180205576     1441.645  100.00% 
Conn:   1 Mbps:     1441.645 Peak Mbps:     1734.723 Avg Mbps:     1441.645
--- fc00:0:0:1::41 tcpbench statistics ---
1177861504 bytes sent over 6.006 seconds
bandwidth min/avg/max/std-dev = 1308.222/1546.020/1734.723/151.566 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
      51     32768         0 
DISABLED