==== 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      165623040     1324.984  100.00% 
Conn:   1 Mbps:     1324.984 Peak Mbps:     1324.984 Avg Mbps:     1324.984
        2001      164008336     1312.067  100.00% 
Conn:   1 Mbps:     1312.067 Peak Mbps:     1324.984 Avg Mbps:     1312.067
        3002      183188112     1464.041  100.00% 
Conn:   1 Mbps:     1464.041 Peak Mbps:     1464.041 Avg Mbps:     1464.041
        4002      192133808     1537.070  100.00% 
Conn:   1 Mbps:     1537.070 Peak Mbps:     1537.070 Avg Mbps:     1537.070
        5002      204926656     1639.413  100.00% 
Conn:   1 Mbps:     1639.413 Peak Mbps:     1639.413 Avg Mbps:     1639.413
--- fc00:0:0:1::41 tcpbench statistics ---
1146229304 bytes sent over 6.002 seconds
bandwidth min/avg/max/std-dev = 1312.067/1455.515/1639.413/125.027 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
      34     32768         0 
DISABLED