DNS flag day 2020, software should reflect the minimum EDNS 1232 bytes.
Added iface_wan and iface_lan to control internal DNS assignemnts and
to control what is local service ACL. Interface wild cards are not
explicitly set so that they can be customized in extended conf.
Signed-off-by: Eric Luehrsen <ericluehrsen@gmail.com>
[Unbound](https://www.unbound.net/) is a validating, recursive, and caching DNS resolver. The C implementation of Unbound is developed and maintained by [NLnet Labs](https://www.nlnetlabs.nl/). It is based on ideas and algorithms taken from a java prototype developed by Verisign labs, Nominet, Kirei and ep.net. Unbound is designed as a set of modular components, so that also DNSSEC (secure DNS) validation and stub-resolvers (that do not run as a server, but are linked into an application) are easily possible.
@ -202,7 +203,7 @@ One instance is supported currently.
| --- | ------- | ----- | ----------- | ------- |
| add_extra_dns | 0 | level | Read OpenWrt traditional options for `dnsmasq`.<br>`0`: Disabled<br>`1`: Use only domain<br>`2`: Use domain, mxhost, and srvhost<br>`3`: Use all cname, domain, mxhost, and srvhost | local-data: |
| add_local_fqdn | 0 | level | Each level puts a more detailed router entry within the LAN DNS (except link).<br>`0`: Disabled<br>`1`: Host name on the primary address<br>`2`: Host name on all addresses<br>`3`: FQDN and host name on all addresses<br>`4`: FQDN defined by "iface.hostname.domain" | local-zone: local-data: |
| add_wan_fqdn | 0 | level | Same as `add_local_fqdn` but on WAN as inferred by `config dhcp` with `option ignore 1`. | local-zone: local-data: |
| add_wan_fqdn | 0 | level | Same as `add_local_fqdn` but on WAN as listed in `iface_wan` | local-zone: local-data: |
| dns64 | 0 | boolean | Enable DNS64 RFC6052 to bridge IPv4 and IPv6 networks. | module: dns64 |
| dns64_prefix | 64:ff9b::/96 | subnet | DNS64 RFC6052 IPv4 in IPv6 well known prefix. | dns64-prefix: |
| dhcp_link | none | program | Link to a DHCP server with supported scripts. See HOW TO above. | local-zone: local-data: forward-zone: |
@ -210,10 +211,13 @@ One instance is supported currently.
| domain | lan | domain | This will suffix DHCP host records and be the default search domain. | local-zone: |
| domain_insecure | (empty) | domain | **List** domains that you wish to skip DNSSEC. It is one way around NTP chicken and egg. Your DHCP domains are automatically included. | domain-insecure: |
| domain_type | static | state | This allows you to lock down or allow forwarding of the local zone.<br>`static`: no forwarding like dnsmasq default<br>`refuse`: answer overtly with REFUSED<br>`deny`: covertly drop all queries<br>`transparent`: may continue forwarding or recusion | local-zone: |
| edns_size | 1280 | bytes | Extended DNS is necessary for DNSSEC. Use this to manage MTU issues. | edns-size: |
| edns_size | 1232 | bytes | Extended DNS is necessary for DNSSEC. Use this to manage MTU issues. | edns-size: |
| extended_stats | 0 | boolean | Extended statistics are stored in Unbound memory for report by `unbound-control`. | extended-statistics: |
| hide_binddata | 1 | boolean | Refuse possible attack queries like version.server, version.bind, id.server, and hostname.bind. | hide-identity: hide-version: |
| interface_auto | 1 | boolean | RECOMMEND ENABLED otherwise Unbound answers to any attached address regardless of query in-address. | interface-automatic: |
| iface_lan | lan | interface | **List** to add interafaces you wish to consider to be LAN beyond those served by DHCP | interface: access-control: |
| iface_trig | lan wan | interface | **List** interfaces to watch IFUP to restart Unbound. This works around `netifd` and `procd` hyper activity with WAN DHCPv6 (else restart each 2-3 minutes). | - |
| iface_wan | wan | interface | **List** interafaces you wish to consider to be WAN for masked local zone purposes | interface-outgoing: |
| interface_auto | 1 | boolean | RECOMMEND ENABLED otherwise Unbound answers to any attached address regardless of query in-address. This also binds Unboud to the wild card address. | interface-automatic: |
| listen_port | 53 | port | Inbound port where Unbound will listen for queries. | port: |
| localservice | 1 | boolean | Prevent DNS amplification attacks. Only answer to subnets this machine has interfaces on. | access-control: |
| manual_conf | 0 | boolean | Skip all this UCI nonsense. Manually edit the configuration in `/etc/unbound/unbound.conf`. | - |
@ -227,7 +231,6 @@ One instance is supported currently.
| recursion | passive | state | Unbound has many options for recrusion but UCI is bundled for simplicity.<br>`passive`: slower until cache fills but kind on CPU load<br>`default`: built-in defaults<br>`aggressive`: uses prefetching to handle more requests quickly | (many) |
| resource | small | state | Unbound has many options for memory resources but UCI is bundled for simplicity.<br>`tiny`: similar to published memory restricted configuration<br>`small`: about half of medium<br>`medium`: similar to default<br>`default`: built-in defaults<br>`large`: about double of medium | \*-cache-size: |
| root_age | 9 | day | >90 Disables. Age limit for root data like root DNSSEC key. Scripts will copy from `tmps` to flash ROM with this limit to save write life. | - |
| trigger_interface | lan wan | interface | **List** interfaces to watch IFUP to restart Unbound. This works around `netifd` and `procd` hyper activity with WAN DHCPv6 (else restart each 2-3 minutes). | - |
| ttl_min | 120 | second | Minimum TTL in cache to avoid abused low TTL for snoop-vertising and non-standard load balancing. Typical to configure maybe 0~300 but 1800 is the maximum accepted. | cache-min-ttl: |
| unbound_control | 0 | level | Enables `unbound-control` application access ports.<br>`0`: None else add your own in unbound_ext.conf<br>`1`: Unencrypted Local Host Access<br>`2`: SSL Local Host Access w/ auto unbound-control-setup<br>`3`: SSL Network Access w/ auto unbound-control-setup<br>`4`: SSL Network Access; static key/pem files must already exist | unbound-control: ... (clause) |
@ -238,7 +241,7 @@ One instance is supported currently.
Confingure any mix of Unbound `forward-zone:`, `stub-zone:`, or `auth-zone:` clauses. These sections are more compact than Unbound and will unroll into Unbound's configuration syntax.
| UCI | Default | Units | Description | Unbound |
| --- | ------- | ----- | ----------- | ------- |
| dns_assist | none | program | Check against local host forwarding by requiring a target program to exist and be enabled else do not permit forwarding `127.0.0.0/8` or `::1`. Includes bind, dnsmasq, ipset-dns, and nsd. | forward-addr: |
| dns_assist | none | program | Check against local host forwarding by requiring a target program to exist and be enabled else do not permit forwarding `127.0.0.0/8` or `::1`. Includes bind, dnsmasq, http-proxy-dns, ipset-dns, and nsd. | forward-addr: |
| enabled | 0 | boolean | turn zone on or off without deleting it | - |
| fallback | 1 | boolean | Allow this zone to fall through to other zones or recursion. | forward-first: |
| port | 53 | port | Target server's target port for plain DNS operations. | (auto 192.0.2.53 \#53)
Eric Luehrsen
4 years ago