V2ray Slow Dns Server Fix May 2026

When setting up a configuration that uses (often referred to as DNS-over-UDP or DNSTT), the "draft text" you need typically refers to the server details generated by a provider or the specific JSON configuration structure. 1. Typical V2Ray Slow DNS Configuration Draft If you are manually drafting a configuration for apps like HTTP Custom , your "text" will follow a structure similar to this: Server Name (Name Server): ://example.com (The subdomain pointing to your server) Public Key: your-generated-public-key-here (Used for encryption) DNS Resolver: (Commonly used upstream resolvers) VMess or VLESS 2. Sample V2Ray JSON (DNS Section)

If you are editing the configuration file directly, the DNS block should look like this to ensure traffic is routed correctly: "localhost" "dns-inbound" Use code with caution. Copied to clipboard 3. Steps to Generate Your Own Text

To get the actual credentials for your draft, follow these steps: Visit a Provider: Search for sites like UDP Custom or similar V2Ray/SlowDNS account creators. Create Account:

Choose a server location, enter a username, and complete the CAPTCHA. Copy Details:

The site will generate a "Slow DNS Config" text block containing your NS (Name Server) Public Key 4. Application-Specific Drafts HTTP Custom: You often import a v2ray slow dns server

Example scenarios & fixes

• Symptom: “Initial page load is very slow, subsequent loads fast” → enable local DNS cache.
• Symptom: “Some sites never load” → test direct resolver; switch to DoH/DoT or different upstream.
• Symptom: “High packet loss on UDP” → enable TCP DNS fallback or DoH.
• Symptom: “DNS works but V2Ray connection still slow” → check outbound routing/proxy latency.

The "IPIfNonMatch" Mistake

Your dns config has a critical parameter: queryStrategy.

"dns": 
  "queryStrategy": "UseIP"  // Bad for slow networks

• UseIP: Queries both A (IPv4) and AAAA (IPv6). If IPv6 is broken on your VPS, it times out waiting.
• Recommended: queryStrategy: "UseIPv4" to halve the DNS wait time.

Solution A: The "Trusted Local" Caching Server (Best for Privacy)

Instead of relying on public resolvers, run a local DNS cache on your VPS using dnsmasq or unbound. This reduces latency to near zero after the first query.

Step 1: Install Dnsmasq

apt install dnsmasq -y

Step 2: Configure Dnsmasq (/etc/dnsmasq.conf) When setting up a configuration that uses (often

port=5353
listen-address=127.0.0.1
cache-size=10000
server=1.1.1.1
server=8.8.8.8

Step 3: Point V2Ray to Localhost In your V2Ray config:

"dns": 
  "servers": [
    "127.0.0.1:5353",
    "1.1.1.1",
    "8.8.8.8"
  ]

Why this works: The first query to google.com hits 127.0.0.1:5353. Dnsmasq fetches it (slow once), caches it. Subsequent queries take ~1ms.

Part 2: Common Causes of Slow DNS in V2Ray

4.6. Split DNS by Domain (Expert)

Send sensitive or foreign domains to a fast public DNS, and local domains to your system DNS:

"dns": 
  "servers": [
"address": "1.1.1.1",
      "domains": ["geosite:google", "geosite:netflix"],
      "expectIPs": ["geoip:us"]
    ,
    "localhost"
  ]

7. Diagnostic Commands

To identify slow DNS as the bottleneck in V2Ray: Example scenarios & fixes

# Test DNS latency from the V2Ray host
dig @1.1.1.1 google.com | grep "Query time"
Solution B: The "DOH" Bypass (Fix UDP Throttling)
If your ISP or VPS provider throttles UDP DNS, switch to DNS-over-HTTPS (DoH). V2Ray natively supports DoH.
Configuration:
"dns": 
  "servers": [
    "https://dns.cloudflare.com/dns-query",
    "https://dns.google/dns-query"
  ]

Why this works: DoH uses TCP port 443 (same as HTTPS). Your V2Ray server treats it like normal web traffic, bypassing UDP shaping completely.