[SOLVED] How to automatically configure IPv6 (stateful DHCPv6)

[Tim Darby]

​Thanks! I've never seen this spelled out so simply and concisely. Is it
just me or is IPv6 client config needlessl​y complex on BSDs?


Tim
​

On Tue, Aug 29, 2017 at 1:28 AM, Aaron LI <aly at aaronly.me> wrote:

> Hello DFlyers,
>
>
> I have figured out the IPv6 configuration problem, here are the details,
> and hope it can help others.
>
>
> IPv6 Autoconfiguration
> ----------------------
> Briefly, there are two kinds of IPv6 autoconfiguration method [1,2]:
>
> * stateless:
>   No DHCP to assign addresses.  IPv6 addresses are built by using
> autoconfiguration and by having routers announce the IP addresses of
> machines in the network.  In this case, "rtsol" tool is needed to
> _solicitate_ that information from routers.
>
> * stateful:
>   DHCP is used to assign addresses.  An IPv6-compatible "dhclient" is
> needed, no autoconfiguration occurs, and "rtsol" is not needed.
>
>
> My Network
> ----------
> My network uses the second "stateful" DHCPv6 method.
>
>
> DragonFly BSD
> -------------
> The "dhclient" shipped in the base system does NOT support IPv6, so my
> previous trials failed to obtain IPv6 address.  (FreeBSD also has the
> same problem.)
>
> Consulting to this post [3], an additional IPv6-compatible DHCP client
> is required to get IPv6 address.  The post's author has made the
> "net/dual-dhclient" port to help the settings.
>
> 1. Install "net/dual-dhclient" package:
> # pkg install dual-dhclient
>
> 2. Add these lines to "/etc/rc.conf":
> dhclient_program="/usr/local/sbin/dual-dhclient"
> ipv6_enable="YES"
> ipv6_network_interfaces="em0"
> ipv6_ifconfig_em0="DHCP"
>
> 3. Restart the network service:
> # service netif restart
>
> DONE!
>
>
> For example, my current interface status looks like:
>
> dfly> ifconfig em0
> em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         options=1b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING>
>         inet6 fe80::21d:9ff:fe88:acd3%em0 prefixlen 64 scopeid 0x1
>         inet 192.168.1.235 netmask 0xffffff00 broadcast 192.168.1.255
>         inet6 2001:da8:8000:6440::be76 prefixlen 64
>         ether 00:1d:09:88:ac:d3
>         media: Ethernet autoselect <rxpause> (100baseTX
> <full-duplex,rxpause>)
>         status: active
>
> (Besides the base "/sbin/dhclient" process for the IPv4 DHCP, there will
> be another "/usr/local/sbin/dhclient -6" process for the IPv6 DHCP.)
>
>
> [1] DHCPv6 - dhclient: https://forums.freebsd.org/threads/6098/#post-36953
> [2] IPv6 Network (auto) configuration: https://egustafson.github.io/
> ipv6-dhcpv6.html
> [3] IPv6 on FreeBSD/EC2: http://www.daemonology.net/
> blog/2017-01-26-IPv6-on-FreeBSD-EC2.html
>
>
> Cheers,
> --
> Aly
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