==== run-tcpbench6-3-1 ====
rm -f nc.log
nc -6 -v -l -V 20 fc00:0:0:1::20 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::20 12345
# Test that path MTU dicovery is working.
tcpbench -6 -t 5 -V 22 -b fc00::22 fc00:0:0:1::20
  elapsed_ms          bytes         mbps   bwidth 
        1000      158760528     1270.084  100.00% 
Conn:   1 Mbps:     1270.084 Peak Mbps:     1270.084 Avg Mbps:     1270.084
        2000      159563616     1276.509  100.00% 
Conn:   1 Mbps:     1276.509 Peak Mbps:     1276.509 Avg Mbps:     1276.509
        3001      156556976     1251.205  100.00% 
Conn:   1 Mbps:     1251.205 Peak Mbps:     1276.509 Avg Mbps:     1251.205
        4002      153144288     1223.930  100.00% 
Conn:   1 Mbps:     1223.930 Peak Mbps:     1276.509 Avg Mbps:     1223.930
        5002      164871240     1320.290  100.00% 
Conn:   1 Mbps:     1320.290 Peak Mbps:     1320.290 Avg Mbps:     1320.290
--- fc00:0:0:1::20 tcpbench statistics ---
949089640 bytes sent over 5.999 seconds
bandwidth min/avg/max/std-dev = 1223.930/1268.404/1320.290/31.731 Mbps
# path MTU discovery in other rtable does not work in ip6_output()
/sbin/route -T 22 -n get -host -inet6 fc00:0:0:1::20
   route to: fc00:0:0:1::20
destination: fc00::
       mask: ffff:ffff:ffff::
    gateway: ::1
  interface: lo22
 if address: ::1
   priority: 8 (static)
      flags: <UP,GATEWAY,DONE,STATIC>
     use       mtu    expire
      19     32768         0 
DISABLED