V2ray Slow Dns: Server Upd

Standard UDP DNS is often throttled or intercepted by firewalls (the "Great Firewall" is notorious for this). Switching to ensures your queries are encrypted and move through the same port as standard web traffic, preventing interference and speeding up resolution in restricted environments. Step C: Optimize the "Rules" Section

This guide breaks down exactly why V2Ray DNS slowdowns happen and provides step-by-step solutions to fix them. Why V2Ray Suffers from Slow DNS Issues

To fix slow DNS, you must first understand how V2Ray handles name resolution. v2ray slow dns server

If no explicit DNS config is provided, V2Ray defaults to the system’s DNS resolver (via Go’s net.Resolver ). This is often slow due to:

Because DNS is mostly UDP Port 53 and involves high overhead for data tunneling, speeds will naturally be lower than standard VPN protocols. Connection Fails:

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. Here's a quick summary of common DNS issues

"domain": ["full:google.com", "full:youtube.com", "keyword:netflix"]

Every DNS lookup takes time. By default, V2Ray's built-in DNS component caches results, meaning it remembers the IP for a domain and doesn't need to look it up again for a certain period. However, if caching is misconfigured or disabled ( disableCache: true ), V2Ray will perform a fresh resolution for , leading to a massive performance penalty.

Don't just rely on one DNS provider. Use a mix of local and remote servers. Why V2Ray Suffers from Slow DNS Issues To

Setting up servers in the DNS object is not enough; you must tell V2Ray how to route those specific DNS queries. Add these rules to your routing block:

This forces the V2Ray server to do the DNS resolution remotely, completely bypassing your slow local DNS server for proxied websites. Clear System DNS Cache

When accessing domestic websites (websites within your country), sending DNS queries through the proxy adds unnecessary latency. V2Ray supports a special "local" mode for DNS over HTTPS that bypasses the routing subsystem entirely.