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Minimal Configuration

The following creates a minimal configuration for validating the plugin and query metadata.

Create Corefile​

Input:

cat > Corefile <<'EOF'
.:53 {
    log
    errors
    asnlookup /opt/geoip2/db/GeoLite2-ASN.mmdb
    metadata
}

example.com {
    view local {
        expr metadata('asnlookup/asn') in ['58820']
    }
    asnlookup /opt/geoip2/db/GeoLite2-ASN.mmdb
    metadata
    file example.com {
        reload 10s
    }
}
EOF

Create Zone file​

cat > example.com<<'EOF'
$TTL 60
@   IN  SOA ns1.nameserver.com. noc.nameserver.com. (
        1758393516 ; Serial
        7200 ; Refresh
        7200 ; Retry
        2419200 ; Expire
        60) ; Minimum TTL

@   IN  NS  ns1.nameserver.com.
@   IN  NS  ns2.nameserver.com.

cdn		IN	A	8.8.8.8
EOF

Run CoreDNS​

Input:

coredns -conf ./Corefile

Output:

.:53
example.com.:53
CoreDNS-1.12.0
linux/amd64, go1.23.0,

Executes an A-record lookup to verify DNS response behavior when the request originates from an IP belonging to ASN 58820.​

Input:

dig A cdn.example.com +short

Output:

8.8.8.8

This response indicates that the DNS server returns the configured address for clients originating from APIK NETWORKS.