1-16Follow these steps to configure the aging time for dynamic PMTUs:To do… Use the command… RemarksEnter system view system-view —Configure the aging time fordynamic PMTUs ipv6 pathmtu age age-time Optional10 minutes by default.Configuring IPv6 TCP PropertiesThe IPv6 TCP properties you can configure include:z synwait timer: When a SYN packet is sent, the synwait timer is triggered. If no response packet isreceived before the synwait timer expires, the IPv6 TCP connection establishment fails.z finwait timer: When the IPv6 TCP connection status is FIN_WAIT_2, the finwait timer is triggered. Ifno packet is received before the finwait timer expires, the IPv6 TCP connection is terminated. If aFIN packet is received, the IPv6 TCP connection status becomes TIME_WAIT. If non-FIN packetsare received, the finwait timer is reset upon receipt of the last non-FIN packet and the connection isterminated after the finwait timer expires.z Size of the IPv6 TCP sending/receiving buffer.Follow these steps to configure IPv6 TCP properties:To do… Use the command… RemarksEnter system view system-view —Set the finwait timer tcp ipv6 timer fin-timeoutwait-timeOptional675 seconds by default.Set the synwait timer tcp ipv6 timer syn-timeoutwait-timeOptional75 seconds by default.Set the size of the IPv6 TCPsending/receiving buffer tcp ipv6 window size Optional8 KB by default.Configuring ICMPv6 Packet SendingConfiguring the Maximum ICMPv6 Error Packets Sent in an IntervalIf too many ICMPv6 error packets are sent within a short time in a network, network congestion mayoccur. To avoid network congestion, you can control the maximum number of ICMPv6 error packetssent within a specified time, currently by adopting the token bucket algorithm.You can set the capacity of a token bucket, namely, the number of tokens in the bucket. In addition, youcan set the update interval of the token bucket, namely, the interval for restoring the configured capacity.One token allows one ICMPv6 error packet to be sent. Each time an ICMPv6 error packet is sent, thenumber of tokens in a token bucket decreases by one. If the number of ICMPv6 error packetssuccessively sent exceeds the capacity of the token bucket, the additional ICMPv6 error packets cannotbe sent out until the capacity of the token bucket is restored.Follow these steps to configure the capacity and update interval of the token bucket:
