To do… Use the command… RemarksSet the finwait timer of IPv6TCP packetstcp ipv6 timer fin-timeoutwait-timeOptional675 seconds by default.Set the synwait timer of IPv6TCP packetstcp ipv6 timer syn-timeoutwait-timeOptional75 seconds by default.Configure the size of IPv6 TCPreceiving/sending buffer tcp ipv6 window size Optional8 KB by default.Configuring the Maximum Number of IPv6 ICMP Error Packets Sent within aSpecified TimeIf too many IPv6 ICMP 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 IPv6 ICMP error packetssent within a specified time. Currently, the token bucket algorithm is adopted.You can set the capacity of a token bucket, namely, the number of tokens in the bucket. In addition, youcan set the update period of the token bucket, namely, the interval for updating the number of tokens inthe token bucket to the configured capacity. One token allows one IPv6 ICMP error packet to be sent.Each time an IPv6 ICMP error packet is sent, the number of tokens in a token bucket decreases by 1. Ifthe number of the IPv6 ICMP error packets that are continuously sent out reaches the capacity of thetoken bucket, the subsequent IPv6 ICMP error packets cannot be sent out until new tokens are put intothe token bucket based on the specified update frequency.Follow these steps to configure the maximum number of IPv6 ICMP error packets sent within aspecified time:To do… Use the command… RemarksEnter system view system-view —Configure the maximumnumber of IPv6 ICMPerror packets sent withina specified timeipv6 icmp-error { bucketbucket-size | ratelimitinterval }*OptionalBy default, the capacity of a tokenbucket is 10 and the update period to100 milliseconds. That is, at most 10IPv6 ICMP error packets can be sentwithin an update period.Configuring the Hop Limit of ICMPv6 Reply PacketsWhen sending an ICMPv6 reply packet, the device will fill a configurable value in the Hop Limit field inthe ICMPv6 reply packet header.Follow these steps to configure the hop limit of ICMPv6 reply packets:To do… Use the command… RemarksEnter system view system-view —Configure the hop limit ofICMPv6 reply packets ipv6 nd hop-limit value Optional64 by default.68-13
