==== 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      162795056     1301.059  100.00% 
Conn:   1 Mbps:     1301.059 Peak Mbps:     1301.059 Avg Mbps:     1301.059
        2005      180861104     1441.124  100.00% 
Conn:   1 Mbps:     1441.124 Peak Mbps:     1441.124 Avg Mbps:     1441.124
        3005      189754840     1519.558  100.00% 
Conn:   1 Mbps:     1519.558 Peak Mbps:     1519.558 Avg Mbps:     1519.558
        4004      201247376     1611.591  100.00% 
Conn:   1 Mbps:     1611.591 Peak Mbps:     1611.591 Avg Mbps:     1611.591
        5005      180863184     1446.905  100.00% 
Conn:   1 Mbps:     1446.905 Peak Mbps:     1611.591 Avg Mbps:     1446.905
--- fc00:0:0:1::41 tcpbench statistics ---
1108793904 bytes sent over 6.002 seconds
bandwidth min/avg/max/std-dev = 1301.059/1464.048/1611.591/102.210 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
      47     32768         0 
DISABLED