==== 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 
        1002      196540416     1569.185  100.00% 
Conn:   1 Mbps:     1569.185 Peak Mbps:     1569.185 Avg Mbps:     1569.185
        2002      213259384     1707.783  100.00% 
Conn:   1 Mbps:     1707.783 Peak Mbps:     1707.783 Avg Mbps:     1707.783
        3002      263613832     2108.911  100.00% 
Conn:   1 Mbps:     2108.911 Peak Mbps:     2108.911 Avg Mbps:     2108.911
        4003      265440536     2121.403  100.00% 
Conn:   1 Mbps:     2121.403 Peak Mbps:     2121.403 Avg Mbps:     2121.403
        5009      186139544     1481.708  100.00% 
Conn:   1 Mbps:     1481.708 Peak Mbps:     2121.403 Avg Mbps:     1481.708
--- fc00:0:0:1::41 tcpbench statistics ---
1332831408 bytes sent over 5.999 seconds
bandwidth min/avg/max/std-dev = 1481.708/1797.798/2121.403/268.995 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
      38     32768         0 
DISABLED