Freebsd ipv6

Keywords: freebsd ipv6
Description: IPv6 is active by default; if not, it can be activated by adding the line ipv6_enable="YES" into the file /etc/rc.conf . The sysctl is set by default (to 1 )

IPv6 is active by default; if not, it can be activated by adding the line ipv6_enable="YES" into the file /etc/rc.conf. The sysctl is set by default (to 1 ) and activates stateless autoconfiguration.

FreeBSD prefers IPv6 if a DNS query results in IPv4 and IPv6 addresses being sent back (A and AAAA RRs).

Privacy addresses are not enabled by default. Their generation is activated with a sysctl: sysctl net.inet6.ip6.use_tempaddr=1 To prefer privacy addresses and use them over the normal addresses, a second sysctl has to be set: sysctl net.inet6.ip6.prefer_tempaddr=1

  • pf can statefully filter both native IPv6 and IPv4-in-IPv6 traffic. Filtering functionality is almost equivalent to the IPv4 implementation. UDP and TCP handling uses the same filtering layer in both protocols.1
  • ipf can filter IPv6.2
  • ipfw can filter IPv6, apparently also statefully.3 (Since release 6.0 or 6.1)

FreeBSD supports configured tunnels with the gif tunnel-interface. Setting up a manual tunnel requires several steps on the command line.

$host-ipv4 IPv4-address of the host $router-ipv4 IPv4-address of the router/tunnel-server $tunnel-v6host (Tunnel) IPv6-address of the host $tunnel-v6router (Tunnel) IPv6-address of the router

Set up the IPv4-endpoints of the tunnel: ifconfig gif0 tunnel $host-ipv4 $router-ipv4 Set up the IPv6-endpoints of the tunnel: ifconfig gif0 inet6 alias $tunnel-v6host $tunnel-v6router prefixlen 128 Set the (IPv6) default route on the tunnel: route add -inet6 default -interface gif0

FreeBSD supports automatic 6to4-tunnelling with the stf tunnel-interface. Setting up a 6to4 tunnel requires several steps on the command line.

Create the interface: ifconfig stf0 create Set up the 6to4/IPv6-endpoint of the tunnel: ifconfig stf0 inet6 $6to4 prefixlen 16 alias Set the (IPv6) default route on the public 6to4 anycast address: route add -inet6 default 2002:c058:6301.

FreeBSD does not integrate DHCPv6 from the KAME IPv6 stack into its base system. DHCPv6 functionality can be obtained through external packages (see DHCPv6 software overview for comparison):

  • WIDE DHCPv6. which implements the KAME DHCPv6 part and is available through FreeBSD’s ports system.
  • ISC DHCP DHCPv6. supports IPv6 since version 4.1.0 (however FreeBSD apparently ships no preconfigured package/ports — NetBSD is the only BSD doing this)

In our test WIDE DHCPv6 acted successfully as DHCPv6 client in stateful and stateless modes and obtained addresses and DNS information (see the above mentioned WIDE DHCPv6 page for more information and configuration hints).

FreeBSD supports two PPP implementations: the feature-rich (and tested here) User PPP. running in userland, and the slimmer Kernel PPP.

FreeBSD integrates an IPv6-capable PPP daemon into its base system. The software supports RFC 24724 and was tested successfully with IPv6 on DSL (via PPPoE). The PPP daemon pppd automatically tries to negotiate IPv6 when establishing the PPP link (IPv6CP) and successfully creates a link-local address for the PPP interface. The IPv6 stack afterward receives RAs on the PPP link and configures an global address on the PPP interface.

Configuration of the PPP daemon is IPv6-agnostic. The following /etc/ppp/ppp.conf contains configuration for a PPPoE link (over the ethernet interface if ):

A manual connection can be made on the command line with: ppp -ddial pppoetest After connection establishment, the default route (for IPv6) has to be put on the PPP interface (tun0 in our case): route add -inet6 default -interface tun0

Since FreeBSD 7.0, the in-kernel PPP network interface supports IPv6/PPPv6.10 Its use has not been further tested and/or researched. In case, cf. the relevant chapters in the FreeBSD Handbook.11.

There is no up-to-date list with the detailed IPv6-related RFCs and IDs FreeBSD supports. However, the FreeBSD Developer’s Handbook contains an older listing, albeit without information on which release and date the document refers to.

Newer RFCs are gathered from modifications logs to the operating system source ( CVS commit logs ) and deduced from various other information. They are referenced individually.

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