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The ungleich DNS infrastructure

Status

This document is IN PRODUCTION.

SEE ALSO

Overview

place4 place5 place6
DNS64 prefix - 2a0a:e5c0:0:1::/96 2a0a:e5c0:2:10::/96
DNS resolver - 2a0a:e5c0::3 2a0a:e5c0::4 2a0a:e5c0:2:1::5 2a0a:e5c0:2:1::6
DNS auth BIND dns1.ungleich.ch dns2.ungleich.ch dns3.ungleich.ch
2a01:4f8:150:7092::2 2a0a:e5c0::1 2a0a:e5c0:2:1::7
176.9.50.202 185.203.112.1 185.203.114.1
DNS auth KNOT - dns7.ungleich.ch dns6.ungleich.ch
  • Every place has 2 redundant caching nameservers.
  • All zones have 3 authorative nameservers, located in 3 different places
  • Important zones (like ungleich.ch) need to be resolvable, even if a place goes offline
    • For this reason some authorative data needs to be on the caching name servers
    • For this reason we stay with a bind9 based setup for the moment (might change in the future)

Architecture

In total we are running 5 servers that are responsible for caching and authorative answers:

  • Authorative
    • 1x server in place4 (bind)
    • 1x VRRP IP of routers in place5 (bind)
    • 1x VRRP IP of routers in place6 (bind)
  • Caching
    • 2x server ip of router in place5 (bind)
    • 2x server ip of router in place6 (bind)

How to update the ungleich DNS servers

To update all servers, use:

cdist config d{1..7}.ungleich.ch

How to use the authorative DNS servers in zone files

Add the following to your zone file:

    ; server1.place4
    IN NS dns1.ungleich.ch.

    ; vrrp active router @ place5
    IN NS dns2.ungleich.ch.

    ; vrrp active router @ place6
    IN NS dns3.ungleich.ch.

Special zones

whoami6.ungleich.ch, whoami4.ungleich.ch

  • Querying whoami6.ungleich.ch for an AAAA record, will return the query source IPv6 address. Only reachable by IPv6.
  • Querying whoami4.ungleich.ch for an AAAA record, will return query source IPv4 address. Only reachable by IPv4.

Updated by Nico Schottelius 3 months ago · 15 revisions