No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search


To have a better experience, please upgrade your IE browser.


CLI-based Configuration Guide - IP Service

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document describes the concepts and configuration procedures of IP Service features on the device, and provides the configuration examples.
Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Why Do I Need to Consider the Interface MTU When Setting the MSS of TCP Packets?

Why Do I Need to Consider the Interface MTU When Setting the MSS of TCP Packets?

The maximum segment size (MSS) is negotiated during TCP connection setup. The MSS determines the maximum length of a TCP packet. Some upper-layer applications such as HTTP reset the Don't fragment (DF) field of IP packets to prevent TCP packets from being fragmented. If the DF field is reset and the interface MTU is smaller than the MSS, the router discards TCP packets because TCP packets cannot be fragmented.

A TCP packet has the TCP header and IP header; therefore, the MSS value plus all the header lengths cannot exceed the MTU. The MTUs supported by Ethernet and PPPoE are 1500 bytes and 1492 bytes respectively. You are advised to set the MSS to 1200 bytes. If the interface MTU is changed or encapsulation packets of some special applications cannot be fragmented in PPPoE, L3VPN, and IPSec scenarios, note the MSS setting.

Updated: 2019-03-06

Document ID: EDOC1100069333

Views: 33731

Downloads: 169

Average rating:
This Document Applies to these Products
Related Version
Related Documents
Previous Next