==== 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 
        1001      175360104     1401.479  100.00% 
Conn:   1 Mbps:     1401.479 Peak Mbps:     1401.479 Avg Mbps:     1401.479
        2001      183724392     1469.795  100.00% 
Conn:   1 Mbps:     1469.795 Peak Mbps:     1469.795 Avg Mbps:     1469.795
        3000      198223024     1587.372  100.00% 
Conn:   1 Mbps:     1587.372 Peak Mbps:     1587.372 Avg Mbps:     1587.372
        4001      264699208     2115.478  100.00% 
Conn:   1 Mbps:     2115.478 Peak Mbps:     2115.478 Avg Mbps:     2115.478
        5005      202729168     1616.982  100.00% 
Conn:   1 Mbps:     1616.982 Peak Mbps:     2115.478 Avg Mbps:     1616.982
--- fc00:0:0:1::20 tcpbench statistics ---
1196077576 bytes sent over 6.001 seconds
bandwidth min/avg/max/std-dev = 1401.479/1638.221/2115.478/251.088 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
      50     32768         0 
DISABLED