An OS independent tool is available:
 tcpdump at
  ftp://ftp.inria.fr/network/tools/libpcap-0.4a5+.tar.gz and
  ftp://ftp.inria.fr/network/tools/tcpdump-3.4a5+.tar.gz

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FIRST read, understand and adapt to /etc/rc.ipv6 script/notepad
(ottawa one is for an host and duvel one is for a router):

> autoconf6
setup everything for you ie do:

    > ifconfig le0 inet6 fe80::a00:20ff:fe0f:28ce/64
    setup link-local address on the Ethernet, if you don't
    know how to use the EUI 64 use eui64 magic option.

    > route -n add -iface -inet6 ff02::/16 fe80::a00:20ff:fe0f:28ce
    > route -n add -iface -inet6 ff12::/16 fe80::a00:20ff:fe0f:28ce
    route site-local multicast through the Ethernet
    (needed for Neighbor Discovery).

    > ifconfig sit0 inet6 ::128.93.1.21/96
    enable the default SIT tunnel.

    > ifconfig lo0 inet6 ::1/128
    loopback.

    > route -n add -iface -inet6 ff01::/16 ::1
    > route -n add -iface -inet6 ff11::/16 ::1
    routes node-local multicast through loopback.

    > route -n add -iface -inet6 ::/0 fe80::a00:20ff:fe0f:28ce
    default route: until a router has been seen every non-local
    destination is "on-link".

> ndpd-host
manages Neighbor Discovery, useful only on an host on a link
with a router...

note: if you want the default small values of ND timers:
    > sysctl -w net.inet6.ipv6.prune=1
    > sysctl -w net.inet6.ipv6.keep=120
    > sysctl -w net.inet6.ipv6.reachable=30
    > sysctl -w net.inet6.ipv6.retrans=1
    > sysctl -w net.inet6.ipv6.probe=5
    > sysctl -w net.inet6.ipv6.hold_down=3


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SECOND

Update inetd.conf in order to specify TCP/IPv4 or UDP/IPv4
for old services.

