==== run-tcpbench6-3-1 ====
rm -f nc.log
nc -6 -v -l -V 20 fc00:0:0:1::20 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::20 12345
# Test that path MTU dicovery is working.
tcpbench -6 -t 5 -V 22 -b fc00::22 fc00:0:0:1::20
  elapsed_ms          bytes         mbps   bwidth 
        1000      154119904     1232.959  100.00% 
Conn:   1 Mbps:     1232.959 Peak Mbps:     1232.959 Avg Mbps:     1232.959
        2000      159387400     1275.099  100.00% 
Conn:   1 Mbps:     1275.099 Peak Mbps:     1275.099 Avg Mbps:     1275.099
        3001      156533288     1251.015  100.00% 
Conn:   1 Mbps:     1251.015 Peak Mbps:     1275.099 Avg Mbps:     1251.015
        4001      152587088     1220.697  100.00% 
Conn:   1 Mbps:     1220.697 Peak Mbps:     1275.099 Avg Mbps:     1220.697
        5002      153395208     1227.162  100.00% 
Conn:   1 Mbps:     1227.162 Peak Mbps:     1275.099 Avg Mbps:     1227.162
--- fc00:0:0:1::20 tcpbench statistics ---
931599376 bytes sent over 6.000 seconds
bandwidth min/avg/max/std-dev = 1220.697/1241.386/1275.099/19.650 Mbps
# path MTU discovery in other rtable does not work in ip6_output()
/sbin/route -T 22 -n get -host -inet6 fc00:0:0:1::20
   route to: fc00:0:0:1::20
destination: fc00::
       mask: ffff:ffff:ffff::
    gateway: ::1
  interface: lo22
 if address: ::1
   priority: 8 (static)
      flags: <UP,GATEWAY,DONE,STATIC>
     use       mtu    expire
      15     32768         0 
DISABLED