DNS Favorites
Bulk Operations
Bulk Lookup
# Bulk DNS lookup with formatted output
for host in vault-01 ise-01 home-dc01 kvm-01 nas-01 bind-01; do
ip=$(host "${host}.inside.domusdigitalis.dev" 10.50.1.90 2>/dev/null | awk '/has address/{print $4}')
printf "%-20s %s\n" "$host" "${ip:-NOT FOUND}"
done
PTR Verification
# Reverse DNS verification
for ip in 10.50.1.{1,10,20,40,50,60,70,90,99,100}; do
ptr=$(dig +short -x "$ip" @10.50.1.90 2>/dev/null)
printf "%-15s %s\n" "$ip" "${ptr:-(no PTR)}"
done
Zone Operations
Zone Transfer (AXFR)
# Zone transfer (AXFR) for audit
dig @10.50.1.90 inside.domusdigitalis.dev AXFR | \
awk '/^[^;]/ && NF>4 {print $1, $4, $5}'
Active Directory SRV Records
# Active Directory SRV record check
for srv in _ldap._tcp _kerberos._tcp _gc._tcp; do
echo "=== $srv ==="
dig +short "${srv}.inside.domusdigitalis.dev" SRV @10.50.1.90
done
pfSense DNS
Add DNS Override
# Add DNS override via netapi
dsource d000 dev/network
netapi pfsense dns add -h k3s-worker-01 -d inside.domusdigitalis.dev -i 10.50.1.123 --descr "k3s worker node 1"
nsupdate Commands
Add A Record
sudo nsupdate -l << 'EOF'
zone inside.domusdigitalis.dev
update add grafana.inside.domusdigitalis.dev. 3600 A 10.50.1.120
send
EOF
Add PTR Record
sudo nsupdate -l << 'EOF'
zone 1.50.10.in-addr.arpa
update add 120.1.50.10.in-addr.arpa. 3600 PTR grafana.inside.domusdigitalis.dev.
send
EOF
Quick Reference
| Pattern | Purpose |
|---|---|
|
Quick IP lookup |
|
Query specific server |
|
Full resolution path |
|
Reverse lookup |
|
All record types |
|
SOA serial check |