Updated on 2021-03-12
Configuring a FreeBSD VPS at MythicBeasts required a bit of messing about with the network configuration to get it online.
/etc/rc.conf
Networking (IPv6 only)
For IPv6 customers are allocated a /64 from a single /48 subnet. We’ll need to learn the routers via router advertisments, but set static address(es)
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ifconfig_vtnet0="inet6 accept_rtadv"
#ifconfig_vtnet0_ipv6="inet6 accept_rtadv"
ifconfig_vtnet0_ipv6="inet6 2a00:1098:88:xx:0:0:0:1 prefixlen 48"
ifconfig_vtnet0_alias0="inet6 2a00:1098:88:xx:0:0:0:70 prefixlen 48"
ifconfig_vtnet0_alias1="inet6 2a00:1098:88:xx:0:0:0:53 prefixlen 48"
ifconfig_vtnet0_alias2="inet6 2a00:1098:88:xx:0:0:0:80 prefixlen 48"
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Note that the syntax ifconfig_vtnet0_ipv6="inet6 accept_rtadv" that I initialy found seems to be wrong, it should be ifconfig_vtnet0="inet6 accept_rtadv" as above.
That should result in
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# ifconfig
vtnet0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=6c07bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
ether 52:54:00:91:24:a8
inet6 2a00:1098:88:xx::1 prefixlen 48
inet6 fe80::5054:ff:fe91:24a8%vtnet0 prefixlen 64 scopeid 0x1
inet6 2a00:1098:88:xx::70 prefixlen 48
inet6 2a00:1098:88:xx::53 prefixlen 48
inet6 2a00:1098:88:xx::80 prefixlen 48
media: Ethernet 10Gbase-T <full-duplex>
status: active
nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
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with the route via the link-local router
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# route -6 get ::
route to: default
destination: default
mask: default
gateway: fe80::21b:21ff:fe9a:4779%vtnet0
fib: 0
interface: vtnet0
flags: <UP,GATEWAY,DONE>
recvpipe sendpipe ssthresh rtt,msec mtu weight expire
0 0 0 0 1500 1 0
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/etc/resolv.conf
Use the Mythic Beasts NAT64 / DNS64 resolvers so we can also access the legacy (IPv4) Internet.
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# cat /etc/resolv.conf
search example.com
nameserver 2a00:1098:0:82:1000:3b:0:1
nameserver 2a00:1098:0:80:1000:3b:0:1
options edns0
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