Virtual Server Network Policy

This page covers the network specifications, recommended settings, and security policies for Virtual Server.

Network Specifications

For traffic pricing and routing profiles (General / China Optimized / China Direct), see the Plans page.

AnyCast Routing

PacketStream uses AnyCast to deliver traffic over the path closest to each user.

• Low latency: Automatic routing to the nearest edge
• High availability: Automatic failover when a path degrades
• Load distribution: Traffic spread across multiple points
• DDoS absorption: Attack traffic absorbed across multiple points

MTU Settings

Because AnyCast paths add tunnel encapsulation overhead, we recommend lowering the MTU.

Why MTU 1400 is recommended:

• Accounting for tunnel overhead (~20–100 bytes), packets are not fragmented along intermediate paths.
• Removing fragment reassembly improves throughput and TCP efficiency.
• Performance stays consistent even when the AnyCast path changes.

Port Policy

Some ports are restricted to prevent abuse. A few can be unblocked after you justify the intended use.

Blocked by Default (can request unblock)

Permanently Blocked (cannot be unblocked)

ASN-based Restrictions

Networks with frequent abuse are subject to communication or rate limits.

Contact

For network configuration questions or port unblock requests, use the ticket system in the console or contact support.

• Support: [email protected]
• Console: portal.packet.stream