R3721-F3210-F3171-HP High-End Firewalls VPN Command Reference-6PW101

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aft prefix-dns64
Syntax
aft prefix-dns64 dns64-prefix prefix-length
undo aft prefix-dns64 dns64-prefix prefix-length
View
System view
Default Level
2: System level
Parameters
dns64-prefix: DNS64 prefix.
prefix-length: Prefix length, which can be 32, 40, 48, 56, 64, or 96 bits.
Description
Use aft prefix-dns64 to specify a DNS64 prefix.
Use undo aft prefix-dns64 to delete a specified DNS64 prefix.
By default, no DNS64 prefix is specified.
NOTE:
• The DNS64 prefix cannot be in the same network segment as the connected IPv6 network. Otherwise,
when an IPv6 host attempts to communicate with an IPv4 host, the IPv6 host multicasts a neighbor
solicitation (NS) packet for the link-layer address of the destination IPv6 address that contains the
DNS64 prefix. AFT does not forward the packet to the IPv4 network or respond to the packet on behalf
of the IPv4 host. As a result, the IPv6 host cannot communicate with the IPv4 host.
• The DNS64 prefix cannot be the same as the IVI prefix. Otherwise, an IPv6 host cannot communicate
with another IPv6 host whose address has an IVI prefix because the AFT device performs address
translation for the packet and sends it to the IPv4 network.
Related commands: display aft all.
Examples
# Specify the DNS64 prefix as 2000:db8e:: and the prefix length as 32.
<Sysname> system-view
[Sysname] aft prefix-dns64 2000:db8e:: 32
aft prefix-ivi
Syntax
aft prefix-ivi ivi-prefix
undo aft prefix-ivi ivi-prefix
View
System view
Default Level
2: System level