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Fit AP V200R010C00 Command Reference

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tcp ipv6 min-mss

tcp ipv6 min-mss

Function

The tcp ipv6 min-mss command sets the minimum value of maximum segment size (MSS) for a TCP6 connection.

The undo tcp ipv6 min-mss command restores the default minimum value of the MSS for a TCP6 connection.

The default minimum MSS value for a TCP6 connection is 216 bytes.

Format

tcp ipv6 min-mss mss-value

undo tcp ipv6 min-mss

Parameters

Parameter Description Value
mss-value Specifies the minimum MSS value for a TCP6 connection. The value ranges from 32 byte to 1500 bytes. By default, the value is 216 bytes.

Views

System view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

To establish a TCP6 connection, the MSS value is negotiated, which indicates the maximum length of packets that the local device can receive. The TCP6 client on a network may send a request packet for establishing a TCP6 connection carrying a small MSS value. For example, the MSS value is 1. After the TCP6 server receives the request packet carrying the MSS value, the TCP6 connection is established. The TCP6 client then may send large numbers of requests to the server by an application, causing the TCP6 server to generate large numbers of reply packets. This may burden the TCP6 server or network, causing denial of service (DoS) attacks. To resolve this problem, run the tcp ipv6 min-mss command to set the minimum MSS value for a TCP6 connection. This configuration prevents a server from receiving packets carrying a small MSS value.

Precautions

If the tcp ipv6 min-mss command is run more than once in the same view, the latest configuration overrides the previous one.

Configure the parameters under the guidance of the technical personnel.

Example

# Set the minimum MSS value for a TCP6 connection to 512 bytes.

<Huawei> system-view
[Huawei] tcp ipv6 min-mss 512
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Updated: 2019-07-18

Document ID: EDOC1100064353

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