==== 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 
        1001      219803720     1756.673  100.00% 
Conn:   1 Mbps:     1756.673 Peak Mbps:     1756.673 Avg Mbps:     1756.673
        2001      237985160     1903.881  100.00% 
Conn:   1 Mbps:     1903.881 Peak Mbps:     1903.881 Avg Mbps:     1903.881
        3003      175097504     1397.984  100.00% 
Conn:   1 Mbps:     1397.984 Peak Mbps:     1903.881 Avg Mbps:     1397.984
        4004      182854856     1461.377  100.00% 
Conn:   1 Mbps:     1461.377 Peak Mbps:     1903.881 Avg Mbps:     1461.377
        5005      186046568     1488.373  100.00% 
Conn:   1 Mbps:     1488.373 Peak Mbps:     1903.881 Avg Mbps:     1488.373
--- fc00:0:0:1::20 tcpbench statistics ---
1199469856 bytes sent over 6.005 seconds
bandwidth min/avg/max/std-dev = 1397.984/1601.658/1903.881/194.609 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
      65     32768         0 
DISABLED