Local DNS - override v6 addresses, don't forward a v6 request if a v4 entry exists

[deHakkelaar]

@voltagex

I've set up local DNS to return 10.0.0.10 for deb.debian.org

Did you read what it says on the page:

The server deb.debian.org does not have packages itself, but the name has SRV records in DNS that lets apt in stretch and later find places.

Debian mirrors backed by Fastly CDN

APT for Debian or Ubuntu etc will connect to those SRV records, if they exist, instead of A or AAAA DNS record(s):

Need to return a different ip than looked up

$ cat /etc/apt/sources.list [..] deb http://deb.debian.org/debian bookworm main contrib non-free-firmware deb-src http://deb.debian.org/debian bookworm main contrib non-free-firmware $ dig +short _http._tcp.deb.debian.org srv 10 1 80 debian.map.fastlydns.net. $ dig +short debian.map.fastlydns.net. 151.101.38.132 Below is a better example for the XBian distro based on Debian and offering three APT mirrors via those SRV records: $ dig +short _http._tcp.apt.xbian.org srv 10 1 80 x…

Another example for the us.archive.ubuntu.com repo:

$ dig +short _http._tcp.us.archive.ubuntu.com srv
2 0 80 ubuntu-mirror-1.ps5.canonical.com.
2 0 80 ubuntu-mirror-2.ps5.canonical.com.
0 0 80 ubuntu-mirror-2.ps6.canonical.com.
0 0 80 ubuntu-mirror-1.ps6.canonical.com.