H3C Technologies H3C S3100 Series Switches - Manual (Page 915)

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Figure 1-7 Diagram for the IPv6 filtering function
The switch can filter invalid IPv6 packets through IPv6 static binding entries or IP-to-MAC address
mappings of IPv6 dynamic binding entries.
IPv6 Static Binding Entry
A static binding is configured manually. It is suitable when there are a few hosts in a LAN or you need to
configure a binding entry for a host separately.
IPv6 Dynamic Binding Entry
You can configure a port to filter arriving IPv6 packets according to DHCPv6 snooping entries or ND
snooping entries obtained automatically. Such a port control feature is applicable to a LAN where many
hosts reside and DHCPv6 is used, thus effectively preventing problems such as IP address conflicts
and IP address spoofing.
z For details about DHCPv6 snooping, refer to Introduction to DHCPv6 Snooping .
z For details about ND snooping, refer to Introduction to ND Snooping .
Introduction to IPv6 DNS
In the IPv6 network, a domain name system (DNS) supporting IPv6 converts domain names into IPv6
addresses. Different from an IPv4 DNS, an IPv6 DNS converts domain names into IPv6 addresses,
instead of IPv4 addresses.
However, just like an IPv4 DNS, an IPv6 DNS also covers static domain name resolution and dynamic
domain name resolution. The function and implementation of these two types of domain name
resolution are the same as those of an IPv4 DNS. For details, refer to DNS..
Usually, the DNS server connecting IPv4 and IPv6 networks contain not only A records (IPv4 addresses)
but also AAAA records (IPv6 addresses). The DNS server can convert domain names into IPv4
addresses or IPv6 addresses. In this way, the DNS server has the functions of both IPv6 DNS and IPv4
DNS.
Protocols and Standards
Protocol specifications related to IPv6 include:
z RFC 1881: IPv6 Address Allocation Management
z RFC 1887: An Architecture for IPv6 Unicast Address Allocation