OPNsense Forum
Archive => 21.7 Legacy Series => Topic started by: sbellon on November 19, 2021, 08:41:35 am
-
Hi all,
when using track6 on the LAN interfaces, can something be configured that local clients' IPv6 addresses are registered as AAAA records when using dnsmasq?
TIA.
Greetings,
Stefan
-
Or is that not possible at all?
-
Wow, this is strange ...
I just noticed that name resolution of local host names in my LAN works for A records but not for AAAA records.
I thought, let's go to OPNsense forums and search ... then I found this topic and ... :-o
Two things:
1) I completely forgot I had asked this seven months ago already.
2) I'm also puzzled as to why this got no response. Am I the only one with that issue or is my expectation stupid?
-
It only works for static mappings. isc-dhcp does not offer host names in IPv6. In dynamic environments use empty prefix addresses as such ::1, etc and they will be expanded automatically.
Cheers,
Franco
-
I'm sorry, I do not understand what you mean with "use empty prefix addresses such as ::1" ... where?
I have configured DHCPv4 for interface LAN, configured an IP range and also defined some static mappings. For the dynamic ones as well as the static ones I can properly get name resolution for A records.
If possible, I'd like to get the same for AAAA records, but I am unsure of a) whether that works at all (from your "isc-dhcp does not offer host names in IPv6" it sounds like it doesn't) or b) how to configure it.
-
Again, host names are not registered in IPv6. We don't get the information in the DHCP server lease file.
# grep hostname /var/dhcpd/var/db/dhcpd.leases | wc -l
12
vs.
# grep hostname /var/dhcpd/var/db/dhcpd6.leases | wc -l
0
It's a small deployment, but it does have IPv6 devices.
In order to be able to use host names for IPv6 addresses it requires static mappings, go to e.g. "Services: DHCPv6: [LAN]" and at the bottom of the page there is a "DHCPv6 Static Mappings for this interface." table. There you can enter a hostname, DUID (MAC equivalent) and address. If you have a tracking interface in the manual mode where DHCPv6 configuration is permitted these addresses will merge the prefix of your interface (/64) with the suffix address you give. Prefix abcd::/64 and address ::1 will be merged as abcd::1.
Cheers,
Franco
-
I appreciate your help very much (and of course also the work you put into OPNsense)!
Ok, I understood the fact that I need static mappings for IPv6 in order to get name resolution. That's fine with me.
However, I do not have "Services: DHCPv6: [LAN]", I only have "Relay" and "Leases" there. BTW: Relay is not enabled because I wouldn't know where to relay to.
I'm sure that I'm still missing something (small) ...
-
Ah, I need to enable "Allow manual adjustement of DHCPv6 and Router Advertisements", then enable "Services: DHCPv6: [LAN]" and configure it.
-
Yes. If the interface doesn't have a static address manual mode is required and set from the interface settings itself which will disable the automatic configuration of radvd/dhcpv6.
Cheers,
Franco
-
Thanks for your help.
To summarize (for others, searching for similar keywords and finding this topic in the future):
- Interfaces -> [LAN] -> Track IPv6 Interface -> [v] Allow manual adjustments of DHCPv6 and Router Advertisements
- Services -> DHCPv6 -> [LAN] -> Enable (and define Lease range)
- Services -> Router Advertisements -> [LAN] -> Assisted
Then setting static IPv6 mappings via Services -> DHCPv6 -> [LAN] (or Leases) are reflected in /var/etc/dnsmasq-hosts and thus IPv4 and (those) IPv6 addresses can be resolved when using OPNsense as name server.