Set a Proper TCP6 Window Size
The TCP6 window size is too small. As a result, a device fails to send or receive packets with the size exceeding the TCP6 window size and TCP6 connections may be interrupted.
Scenario
Services established based on TCP6 connections, such as BGP and LDP services, are deployed.
Configuration Requirements
The tcp ipv6 window window-size command is run in the system view to configure the TCP6 window size as a reasonable value.
Misconfiguration Risks
Risk description:
The tcp ipv6 window window-size command is run in the system view to configure the TCP6 window size. For example, tcp ipv6 window 1 indicates that the TCP6 window size is 1K.
The size of sent and received TCP6 packets exceeds the TCP6 window size, such as 1K in the preceding example.
If the preceding conditions are met, TCP6 connections are interrupted, which may affect TCP6 service forwarding.
Identification method:
Run the display tcp ipv6 status command in the user view to check the TCP6 connection status.
If TCP6 connections are normal, the command output displays information about the TCP6 connections.
<HUAWEI> display tcp ipv6 status
* - MD5 Authentication is enabled. # - Keychain Authentication is enabled. TCP6CB TID/SoID Local Address Foreign Address State VPNID 78004bdc 144/3 ::->22 ::->0 Listening 23553 78000dbc 144/2 ::->23 ::->0 Listening 2355312d26d68 144/6 2000::1->23 2000::2->57582 Established 0
If TCP6 connections are interrupted, the command output does not display information about the TCP6 connections.
<HUAWEI> display tcp ipv6 status
* - MD5 Authentication is enabled. # - Keychain Authentication is enabled. TCP6CB TID/SoID Local Address Foreign Address State VPNID 78004bdc 144/3 ::->22 ::->0 Listening 23553 78000dbc 144/2 ::->23 ::->0 Listening 23553
Recovery measures:
Configure the TCP6 window size as a reasonable value.
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