==== 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      158809768     1270.478  100.00% 
Conn:   1 Mbps:     1270.478 Peak Mbps:     1270.478 Avg Mbps:     1270.478
        2001      183176392     1465.411  100.00% 
Conn:   1 Mbps:     1465.411 Peak Mbps:     1465.411 Avg Mbps:     1465.411
        3001      170401504     1364.577  100.00% 
Conn:   1 Mbps:     1364.577 Peak Mbps:     1465.411 Avg Mbps:     1364.577
        4001      182305200     1458.442  100.00% 
Conn:   1 Mbps:     1458.442 Peak Mbps:     1465.411 Avg Mbps:     1458.442
        5008      162569568     1292.800  100.00% 
Conn:   1 Mbps:     1292.800 Peak Mbps:     1465.411 Avg Mbps:     1292.800
--- fc00:0:0:1::41 tcpbench statistics ---
1053209056 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1270.478/1370.341/1465.411/81.017 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
      68     32768         0 
DISABLED