==== 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      190290408     1522.323  100.00% 
Conn:   1 Mbps:     1522.323 Peak Mbps:     1522.323 Avg Mbps:     1522.323
        2001      200626992     1605.016  100.00% 
Conn:   1 Mbps:     1605.016 Peak Mbps:     1605.016 Avg Mbps:     1605.016
        3016      205785352     1621.954  100.00% 
Conn:   1 Mbps:     1621.954 Peak Mbps:     1621.954 Avg Mbps:     1621.954
        4018      213061600     1702.790  100.00% 
Conn:   1 Mbps:     1702.790 Peak Mbps:     1702.790 Avg Mbps:     1702.790
        5017      288025064     2306.507  100.00% 
Conn:   1 Mbps:     2306.507 Peak Mbps:     2306.507 Avg Mbps:     2306.507
--- fc00:0:0:1::41 tcpbench statistics ---
1289256936 bytes sent over 6.015 seconds
bandwidth min/avg/max/std-dev = 1522.323/1751.718/2306.507/283.255 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
      37     32768         0 
DISABLED