Before fixing the problem, you need hard evidence that DNS is the bottleneck. Do not guess.
"log":
"loglevel": "info",
"access": "/var/log/v2ray/access.log",
"error": "/var/log/v2ray/error.log"
,
"dns":
"servers": [
"address": "8.8.8.8"
,
"address": "1.1.1.1"
]
,
// Other configurations...
This snippet illustrates how to specify DNS servers in a V2Ray configuration.
By following these steps and tips, you can potentially resolve issues related to slow DNS servers on V2Ray and improve your overall experience with the platform.
A V2Ray Slow DNS server is a specialized VPN configuration used primarily to bypass internet censorship and firewalls by tunneling traffic through the DNS protocol (UDP Port 53)
. While traditionally "SlowDNS" refers to a slower method of data transfer, modern setups combine it with V2Ray (often VMess) to provide a more stable and secure internet connection in restricted regions. Core Components & Setup
To set up a functional connection, you typically need to coordinate details between a server provider and a mobile client app like HTTP Custom Server Details : You must obtain a Name Server (NS) Public Key from a provider (e.g., UDP Custom V2Ray Config v2ray slow dns server
: A VMess or V2Ray configuration string that contains the server address and ID. Client Configuration : Apps like HTTP Custom
allow you to check both "Slow DNS" and "V2Ray" options simultaneously to bridge the protocols. How to Configure (HTTP Custom Example) Generate Server Details : Visit a site like UDP Custom
to create a free account. Copy the provided Name Server (NS) and Public Key. V2Ray Setup
: In your VPN app, navigate to the V2Ray plugin section and paste your server config (VMess link). Slow DNS Setup DNS address Name Server (NS) Public Key into their respective fields.
: Return to the main screen, ensure both V2Ray and Slow DNS are enabled, and tap Optimization Tips Before fixing the problem, you need hard evidence
Run tcpdump -i any port 53 while browsing. Observe:
If V2Ray forwards DNS queries to a server that ultimately routes back through V2Ray (a loop), latency explodes.
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"
]
Make sure your routing rules do not send traffic from your DNS upstream IPs back through the proxy.
Example: Add direct rule for DNS server IPs: This snippet illustrates how to specify DNS servers
"routing":
"rules": [
"type": "field",
"ip": ["1.1.1.1", "8.8.8.8"],
"outboundTag": "direct"
]
For every outbound connection initiated by an application through V2Ray:
Equation:
Total latency = DNS_RTT + (proxy_handshake_RTT * proxy_hops)
If DNS_RTT = 500ms (common for overloaded or remote servers), every new domain connection suffers a minimum 0.5s penalty, regardless of proxy speed.
If you're using V2RayN (a client for Windows), you can: