When implementing my custom nameserver for *.iwanhae.ga domains, I noticed peculiar behavior across different DNS providers. While Google's 8.8.8.8 successfully resolves blog.iwanhae.ga to 175.193.162.44, Verizon's 4.2.2.2 returns SERVFAIL. This inconsistency suggests either propagation issues or configuration problems in the nameserver setup.

First, check your zone file configuration for potential syntax errors. A proper zone file should include:

$TTL 86400
@ IN SOA ns1.iwanhae.ga. admin.iwanhae.ga. (
    2023111501 ; Serial
    3600       ; Refresh
    1800       ; Retry
    604800     ; Expire
    86400      ; Minimum TTL
)

@       IN NS    ns1.iwanhae.ga.
@       IN A     175.193.162.44
blog    IN A     175.193.162.44

SERVFAIL typically indicates one of these issues:

• Missing or incorrect glue records at registrar
• DNSSEC validation failures (if enabled)
• Nameserver timeout or connectivity issues
• Zone file syntax errors

Use dig to verify DNSSEC chain:

dig +dnssec blog.iwanhae.ga @8.8.8.8
dig +dnssec blog.iwanhae.ga @4.2.2.2

Global DNS propagation can take up to 48 hours. Verify current status with:

for server in 8.8.8.8 4.2.2.2 1.1.1.1 9.9.9.9; do
    echo "Testing $server";
    dig @$server blog.iwanhae.ga +short;
done

Ensure your nameserver is accessible globally:

# Test UDP port 53 accessibility
nc -zv -u your.nameserver.ip 53

# Test TCP port 53 (used for large responses)
nc -zv your.nameserver.ip 53

Set up continuous DNS monitoring with a simple Python script:

import dns.resolver

servers = ['8.8.8.8', '4.2.2.2', '1.1.1.1']
domain = 'blog.iwanhae.ga'

for server in servers:
    resolver = dns.resolver.Resolver()
    resolver.nameservers = [server]
    try:
        answer = resolver.resolve(domain)
        print(f"{server}: {answer[0]}")
    except Exception as e:
        print(f"{server}: Failed ({str(e)})")

For custom nameservers, always verify configuration from multiple perspectives - zone files, network accessibility, and global propagation status. The SERVFAIL inconsistency suggests either timeout issues with certain resolvers or missing glue record propagation.

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While setting up my custom nameserver for *.iwanhae.ga domains, I noticed inconsistent behavior across public DNS resolvers. Google's 8.8.8.8 successfully resolves blog.iwanhae.ga to 175.193.162.44, while Verizon's 4.2.2.2 returns SERVFAIL.

# Successful query
nslookup blog.iwanhae.ga 8.8.8.8
Non-authoritative answer:
Name:   blog.iwanhae.ga
Address: 175.193.162.44

# Failed query
nslookup blog.iwanhae.ga 4.2.2.2
** server can't find blog.iwanhae.ga: SERVFAIL

SERVFAIL typically indicates server-side problems. For custom nameservers, these are the most likely culprits:

• Incorrect zone file configuration
• Missing or expired DNSSEC records
• Nameserver connectivity issues
• Rate limiting by public resolvers
• Propagation delays

First, verify your nameserver's configuration using dig:

dig @your.nameserver.ip blog.iwanhae.ga +norecurse +nocmd

Check for these critical elements:

; AUTHORITY SECTION:
iwanhae.ga.        86400   IN  NS  ns1.iwanhae.ga.
iwanhae.ga.        86400   IN  NS  ns2.iwanhae.ga.

; ADDITIONAL SECTION:
ns1.iwanhae.ga.    86400   IN  A   175.193.162.44
ns2.iwanhae.ga.    86400   IN  A   175.193.162.45

Many public resolvers now require proper DNSSEC. Check your setup:

dig +dnssec blog.iwanhae.ga
delv blog.iwanhae.ga

If you're using BIND, ensure your zone file includes:

$INCLUDE "/path/to/Kiwanhae.ga.+013+12345.key"
$INCLUDE "/path/to/dsset-iwanhae.ga."

Use multiple tools to check global resolution:

# Using DNSViz for visualization
curl -s https://dnsviz.net/d/iwanhae.ga/dnssec/ | grep -A10 "Validation"

For immediate troubleshooting:

1. Increase TTL values during testing (3600+ seconds)
2. Ensure all nameserver glue records are properly registered
3. Verify firewall rules allow UDP/53 and TCP/53 traffic
4. Check for syntax errors in zone files with named-checkzone

named-checkzone iwanhae.ga /etc/bind/zones/iwanhae.ga.db

Set up a simple monitoring script to track resolution across major providers:

#!/bin/bash
RESOLVERS=("8.8.8.8" "4.2.2.2" "1.1.1.1" "9.9.9.9")
DOMAIN="blog.iwanhae.ga"

for resolver in "${RESOLVERS[@]}"; do
  result=$(dig +short @$resolver $DOMAIN)
  echo "$resolver: ${result:-SERVFAIL}"
  sleep 1
done

This helps identify which resolvers are consistently failing and need special attention.