==== 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      212202616     1695.925  100.00% 
Conn:   1 Mbps:     1695.925 Peak Mbps:     1695.925 Avg Mbps:     1695.925
        2001      252199480     2017.596  100.00% 
Conn:   1 Mbps:     2017.596 Peak Mbps:     2017.596 Avg Mbps:     2017.596
        3003      269748016     2155.828  100.00% 
Conn:   1 Mbps:     2155.828 Peak Mbps:     2155.828 Avg Mbps:     2155.828
        4005      198359104     1583.705  100.00% 
Conn:   1 Mbps:     1583.705 Peak Mbps:     2155.828 Avg Mbps:     1583.705
        5005      195575808     1566.173  100.00% 
Conn:   1 Mbps:     1566.173 Peak Mbps:     2155.828 Avg Mbps:     1566.173
--- fc00:0:0:1::41 tcpbench statistics ---
1327908472 bytes sent over 5.999 seconds
bandwidth min/avg/max/std-dev = 1566.173/1803.845/2155.828/239.240 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