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Update 'user/pages/01.home/dns/default.md'

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burble 2019-06-08 16:28:21 +01:00
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user/pages/01.home/dns/default.md
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@ -10,7 +10,7 @@ burble.dn42 DNS services
# DNS Services
burble.dn42 DNS services are anycast across every node to provide fast, local responses network wide
burble.dn42 DNS services are anycast across every node to provide fast, local responses network wide.
## Authoritative DNS Service
@ -34,6 +34,7 @@ Forwarding is provided by the recursive service, dns.burble.dn42.*
* .dn42
* .recursive-servers.dn42
* .delegation-servers.dn42
* .registry-sync.dn42
* d.f.ip6.arpa.
* 20.172.in-addr.arpa.
* 21.172.in-addr.arpa.
@ -61,7 +62,11 @@ The root zone also includes stubs for resolving domains in networks associated t
| dns.burble.dn42<br/>b.recursive-servers.dn42| 172.20.129.2<br/>fd42:4242:2601:ac53::53 |
<br/>
dns.burble.dn42 is a caching, recursive DNS service for DN42 related zones using
the burble.dn42 authoritative service as a local root zone.
the burble.dn42 authoritative service as a local root zone. By issuing parallel queries
across five regional masters, the recursive service takes advantage of the burble.dn42 global
scale to reduce latency and avoid local connectivity problems.
The recursor is DNSSEC enabled and validates all queries.
#### Using the recursive DNS service
@ -111,13 +116,21 @@ nameserver 172.20.20.65
## Implementation
The DNS service is implemented as a tiered, anycast service with each node
in the network providing a local cache in front of regional, master nodes.
in the network providing a local cache in front of five, regional, master nodes.
#### Edge Nodes
Each node in the network runs [dnsdist](https://dnsdist.org/), which forwards
queries to regional master nodes and then caches the responses to provide
a fast, local access to DNS data.
The ns1.burble.dn42 authoritative service is provided by [dnsdist](https://dnsdist.org/).
Queries are forwarded to the nearest regional master node and responses are then cached.
If the regional master is not available, the next nearest will be queried until a response is found.
The dns.burble.dn42 recursive service is provided by [dnsmasq](http://www.thekelleys.org.uk/dnsmasq/doc.html)
configured using the 'all-servers' mode. Queries are forwarded to all 5 regional masters in parallel
and the first response received is then returned. This approach ensures users get the lowest latency
results possible, regardless of location, and that any local connectivity issues do not impact the results.
Recursive queries are cached on the edge nodes and master nodes, creating a network wide cache
of results across all users of the service.
Anycast routes to the DNS servers are advertised to the main Bird2 instance using
[GoBGP](https://github.com/osrg/gobgp) and a health checking script.