3Com MSR 50 Series, Configuration Manual

Page: 673 / 2443

Configuring IPv6 DNS 673
Enable Sending of
Multicast Echo Replies
If hosts are capable of replying multicast echo requests, Host A can attack Host B
by sending an echo request with the source being Host B to a multicast address,
then all the hosts in the multicast group will send echo replies to Host B.
Therefore, to prevent such an attack, a device is disabled from replying multicast
echo requests by default.
Follow these steps to enable sending of multicast echo replies:
Configuring IPv6 DNS
Configuring Static IPv6
Domain Name
Resolution
Configuring static IPv6 domain name resolution is to establish the mapping
between host name and IPv6 address. When applying such applications as Telnet,
you can directly use a host name and the system will resolve the host name into an
IPv6 address. Each host name can correspond to only one IPv6 address.
Follow these steps to configure static IPv6 domain name resolution:
Configuring Dynamic
IPv6 Domain Name
Resolution
You can use the following command to enable the dynamic domain name
resolution function. In addition, you should configure a DNS server so that a query
request message can be sent to the correct server for resolution. The system can
support at most six DNS servers.
You can configure a DNS suffix so that you only need to enter part of a domain
name and the system can automatically add the preset suffix for address
resolution. The system can support at most 10 DNS suffixes.
Follow these steps to configure dynamic IPv6 domain name resolution:
Configure the capacity
and update period of
the token bucket ipv6 icmp-error { bucket
bucket-size | ratelimit
interval } *
Optional
By default, the capacity of a token
bucket is 10 and the update period is
100 milliseconds. That is, at most 10
IPv6 ICMP error packets can be sent
within these 100 milliseconds.
The update period “0” indicates that
the number of ICMPv6 error packets
sent is not restricted.
To do... Use the command... Remarks
To do... Use the command... Remarks
Enter system view system-view -
Enable sending of multicast
echo replies ipv6 icmpv6
multicast-echo-reply
enable Required
Not enabled by default.
To do... Use the command... Remarks
Enter system view system-view -
Configure a host name and the
corresponding IPv6 address ipv6 host hostname ipv6-address Required