==== 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 
        1001      220184312     1759.715  100.00% 
Conn:   1 Mbps:     1759.715 Peak Mbps:     1759.715 Avg Mbps:     1759.715
        2001      262722456     2101.780  100.00% 
Conn:   1 Mbps:     2101.780 Peak Mbps:     2101.780 Avg Mbps:     2101.780
        3004      189928264     1514.881  100.00% 
Conn:   1 Mbps:     1514.881 Peak Mbps:     2101.780 Avg Mbps:     1514.881
        4015      188212648     1490.793  100.00% 
Conn:   1 Mbps:     1490.793 Peak Mbps:     2101.780 Avg Mbps:     1490.793
        5016      201019488     1608.156  100.00% 
Conn:   1 Mbps:     1608.156 Peak Mbps:     2101.780 Avg Mbps:     1608.156
--- fc00:0:0:1::41 tcpbench statistics ---
1264634872 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1490.793/1695.065/2101.780/224.206 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
      55     32768         0 
DISABLED