3Com Switch 4800G 24-Port - Configuring Ipv6 TCP Properties; Configuring Icmpv6 Packet Sending

514 CHAPTER 38: IPV6 BASICS CONFIGURATION
host sends subsequent packets to the destination host on basis of this MTU. After
the aging time expires, the dynamically determined PMTU is removed and the
source host re-determines an MTU to send packets through the PMTU mechanism.
The aging time is invalid for static PMTU.
Follow these steps to configure the aging time for PMTU:
Configuring IPv6 TCP
Properties
The IPv6 TCP properties you can configure include:
■ synwait timer: When a SYN packet is sent, the synwait timer is triggered. If no
response packet is received before the synwait timer expires, the IPv6 TCP
connection establishment fails.
■ 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 a FIN packet is received, the IPv6 TCP
connection status becomes TIME_WAIT. If other packets are received, the
finwait timer is reset from the last received packet and the connection is
terminated after the finwait timer expires.
■ Size of the IPv6 TCP sending/receiving buffer.
Follow these steps to configure IPv6 TCP properties:
Configuring ICMPv6
Packet Sending
Configuring the
Maximum ICMPv6 Error
Packets Sent in an
Interval
If too many ICMPv6 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 ICMPv6 error packets sent 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, 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
To do… Use the command… Remarks
Enter system view system-view -
Configure aging time for
PMTU
ipv6 pathmtu age age-time Optional
10 minutes by default.
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.
Set the size of the IPv6 TCP
sending/receiving buffer
tcp ipv6 window size Optional
8 KB by default.