Hi Tobias, I've had the same Issue here delegating prefixes to my VPN-Gateway in my home-hetwork.
My solution back then was to ditch systemd-networkd for this setup and rely on configuring dhcpcd and radvd accordingly. Systemd's DHCP-implementation seems to a little bit out of whack, depending on the version. Unfortunately that VPN-Gateway got decommissioned and I don't have a backup of those two config-files. If I remember right, I kept the config close to what the ArchLinux-Wiki suggests. YT, VT. On 4/10/20 1:34 PM, Tobias Brink wrote: > Hello debian-user, > > I have an internet connection via a router provided by my ISP. I have a > Linux box (Debian Buster) between this router and my internal network in > order to provide nicer firewalling and some services like OpenVPN, wifi > for guests without access to the internal network, and so on. > > In order to provide IPv6 to my internal network, I use IPv6 prefix > delegation to get a prefix from the ISP-provided router. That works and > my systemd-networkd (systemd version 244.3-1 from backports) config > files look somewhat like this: > > #/etc/systemd/network/10-enp3s0.network <- the "external" interface > > [Match] > Name=enp3s0 > > [Network] > Address=<some RFC1918 IPv4 address> > Gateway=<IPv4 gateway> > Address=fdxx:xxxx:xxxx:xxxx::1/64 > IPv6AcceptRA=yes > DHCP=ipv6 > IPv6PrivacyExtensions=true > > [DHCPv6] > ForceDHCPv6PDOtherInformation=yes > > > #/etc/systemd/network/20-br0.network <- the "internal" interface > > [Match] > Name=br0 > > [Network] > Address=<some RFC1918 IPv4 address> > Address=fdxx:xxxx:xxxx:yyyy::1/64 > IPv6PrefixDelegation=yes > > [IPv6PrefixDelegation] > Managed=yes > OtherInformation=yes > RouterLifetimeSec=7200 > EmitDNS=yes > DNS=fdxx:xxxx:xxxx:yyyy::1 > DNSLifetimeSec=7200 > > [IPv6Prefix] > Prefix=fdxx:xxxx:xxxx:yyyy::/64 > ValidLifetimeSec=7200 > PreferredLifetimeSec=3600 > > > That works quite nicely and I get both ULA addresses and some dynamic > prefix from my ISP for the internal net. Unfortunately, whenever the > public IPv6 prefix changes [enforced nightly by the ISP :-( ] the prefix > delegation is lost and I only retain IPv4 and the ULA addresses on my > internal network. The external interface enp3s0 gets a new public IPv6 > address without trouble, though. Debug logs from systemd-networkd > contain the following at the relevant time (nothing else relevant, > though): > > DHCPv6 CLIENT: Sent RENEW > DHCPv6 CLIENT: Next retransmission in 9s > DHCPv6 CLIENT: REPLY Status Binding unavailable > > It seems that the built-in DHCPv6 client of systemd tries to renew the > old prefix and is denied. It does not seem to request a new prefix. Does > anybody have some experience with this? Is this a bug in > systemd-networkd or the ISP-provided router? Some other problem? > > It is also a bit annoying to implement a workaround. While "networkctl > reconfigure enp3s0" does the trick and gets a new delegated prefix, I am > not sure how to automate this command. There seems to be no tool to show > the delegated prefixes, so I cannot find out when they are lost. Does > somebody have an idea? > > Any help appreciated. > > Tobias >
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