==== 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      181335536     1450.684  100.00% 
Conn:   1 Mbps:     1450.684 Peak Mbps:     1450.684 Avg Mbps:     1450.684
        2001      212575240     1698.903  100.00% 
Conn:   1 Mbps:     1698.903 Peak Mbps:     1698.903 Avg Mbps:     1698.903
        3001      223370024     1788.749  100.00% 
Conn:   1 Mbps:     1788.749 Peak Mbps:     1788.749 Avg Mbps:     1788.749
        4002      223963576     1791.709  100.00% 
Conn:   1 Mbps:     1791.709 Peak Mbps:     1791.709 Avg Mbps:     1791.709
        5002      303610016     2428.880  100.00% 
Conn:   1 Mbps:     2428.880 Peak Mbps:     2428.880 Avg Mbps:     2428.880
--- fc00:0:0:1::41 tcpbench statistics ---
1353760272 bytes sent over 6.003 seconds
bandwidth min/avg/max/std-dev = 1450.684/1831.785/2428.880/323.381 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
      40     32768         0 
DISABLED