1-13
z finwait timer: When the IPv6 TCP connection status is FIN_WAIT_2, the finwait timer is triggered. If
no packet is received before the finwait timer expires, the IPv6 TCP connection is terminated. If FIN
packets are received, the IPv6 TCP connection status becomes TIME_WAIT. If other packets are
received, the finwait timer is reset from the last packet and the connection is terminated after the
finwait timer expires.
z Size of IPv6 TCP receiving/sending buffer.
Table 1-12 Configure IPv6 TCP properties
To do… Use the command… Remarks
Enter system view
system-view
—
Set the finwait timer of IPv6
TCP packets
tcp ipv6 timer fin-timeout
wait-time
Optional
675 seconds by default
Set the synwait timer of IPv6
TCP packets
tcp ipv6 timer syn-timeout
wait-time
Optional
75 seconds by default
Configure the size of IPv6 TCP
receiving/sending buffer
tcp ipv6 window size
Optional
8 KB by default
Configuring the Maximum Number of IPv6 ICMP Error Packets Sent within a
Specified Time
If too many IPv6 ICMP error packets are sent within a short time in a network, network congestion may
occur. To avoid network congestion, you can control the maximum number of IPv6 ICMP error packets
sent 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, you
can set the update period of the token bucket, namely, the interval for updating the number of tokens in
the 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. If
the number of the IPv6 ICMP error packets that are continuously sent out reaches the capacity of the
token bucket, the subsequent IPv6 ICMP error packets cannot be sent out until new tokens are put into
the token bucket based on the specified update frequency.
Table 1-13 Configure the maximum number of IPv6 ICMP error packets sent within a specified time
To do… Use the command… Remarks
Enter system view
system-view
—
Configure the maximum
number of IPv6 ICMP error
packets sent within a
specified time
ipv6 icmp-error { bucket
bucket-size | ratelimit
interval }*
Optional
By default, the capacity of a token
bucket is 10 and the update period to
100 milliseconds. That is, at most 10
IPv6 ICMP error packets can be sent
within an update period.
Configuring the Hop Limit of ICMPv6 Reply Packets
When sending an ICMPv6 reply packet, the device will fill a configurable value in the Hop Limit field in
the ICMPv6 reply packet header.
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