==== 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      171532944     1370.893  100.00% 
Conn:   1 Mbps:     1370.893 Peak Mbps:     1370.893 Avg Mbps:     1370.893
        2007      181047456     1441.174  100.00% 
Conn:   1 Mbps:     1441.174 Peak Mbps:     1441.174 Avg Mbps:     1441.174
        3006      220056824     1763.983  100.00% 
Conn:   1 Mbps:     1763.983 Peak Mbps:     1763.983 Avg Mbps:     1763.983
        4005      215324312     1724.319  100.00% 
Conn:   1 Mbps:     1724.319 Peak Mbps:     1763.983 Avg Mbps:     1724.319
        5006      220315256     1762.522  100.00% 
Conn:   1 Mbps:     1762.522 Peak Mbps:     1763.983 Avg Mbps:     1762.522
--- fc00:0:0:1::41 tcpbench statistics ---
1218054616 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1370.893/1612.578/1763.983/170.695 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
      56     32768         0 
DISABLED