The ungleich DNS infrastructure¶

• Table of contents
• The ungleich DNS infrastructure
  • Status
  • SEE ALSO
  • Overview
  • Architecture
  • How to update the ungleich DNS servers
  • How to use the authorative DNS servers in zone files
  • Special zones
    • whoami6.ungleich.ch, whoami4.ungleich.ch

Status¶

This document is IN PRODUCTION.

SEE ALSO¶

• The_ungleich_network_infrastructure

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.