3com S7906E Manuel De Montage

 

1-17 

Configure the number of 
attempts to send an NS 
message for DAD 

ipv6 nd dad attempts value 

Optional 

1 by default. When the value 
argument is set to 0, DAD is 
disabled. 

 

You can configure a static PMTU for a specified destination IPv6 address. When a source host sends a 

packet through an interface, it compares the interface MTU with the static PMTU of the specified 

destination IPv6 address. If the packet size is larger than the smaller one between the two values, the 

host fragments the packet according to the smaller value. 

Follow these steps to configure a static PMTU for a specified address: 

Enter system view 

— 

Configure a static PMTU for a 
specified IPv6 address 

ipv6 pathmtu ipv6-address 
[ value ] 

Required 

By default, no static PMTU is 
configured. 

 

After the path MTU from a source host to a destination host is dynamically determined (refer to 

, the source host sends subsequent packets to the destination host on basis of this 

MTU. After the aging time expires, the dynamic PMTU is removed and the source host re-determines a 

dynamic path MTU through the PMTU mechanism. 

The aging time is invalid for a static PMTU. 

Follow these steps to configure the aging time for dynamic PMTUs: 

Enter system view 

— 

Configure the aging time for 
dynamic PMTUs 

ipv6 pathmtu age age-time 

Optional 

10 minutes by default. 

 

The 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 is 

received 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. 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 non-FIN packets