Enabling Sending Icmpv6 Time Exceeded Messages; Enabling Sending Icmpv6 Destination Unreachable Messages - HP 3600 v2 Series Configuration Manual

To enable replying to multicast echo requests:
Step
1. Enter system view.
2. Enable replying to multicast
echo requests.

Enabling sending ICMPv6 time exceeded messages

A device sends out an ICMPv6 Time Exceeded message in the following situations:
If a received IPv6 packet's destination IP address is not a local address and its hop limit is 1, the
•
device sends an ICMPv6 Hop Limit Exceeded message to the source.
Upon receiving the first fragment of an IPv6 datagram with the destination IP address being the
•
local address, the device starts a timer. If the timer expires before all the fragments arrive, an
ICMPv6 Fragment Reassembly Timeout message is sent to the source.
If large quantities of malicious packets are received, the performance of a device degrades greatly
because it must send back ICMP Time Exceeded messages. You can disable sending ICMPv6 Time
Exceeded messages.
To enable sending ICMPv6 time exceeded messages:
Step
1. Enter system view.
2. Enable sending ICMPv6 Time
Exceeded messages.

Enabling sending ICMPv6 destination unreachable messages

If the device fails to forward a received IPv6 packet because of one of the following reasons, it drops the
packet and sends a corresponding ICMPv6 Destination Unreachable error message to the source.
If no route is available for forwarding the packet, the device sends a "no route to destination"
•
ICMPv6 error message to the source.
If the device fails to forward the packet because of an administrative prohibition (such as a firewall
•
filter or an ACL), the device sends the source a "destination network administratively prohibited"
ICMPv6 error message.
If the device fails to deliver the packet because the destination is beyond the scope of the source
•
IPv6 address (for example, the source IPv6 address of the packet is a link-local address whereas the
destination IPv6 address of the packet is a global unicast address), the device sends the source a
"beyond scope of source address" ICMPv6 error message.
If the device fails to resolve the corresponding link layer address of the destination IPv6 address, the
•
device sends the source an "address unreachable" ICMPv6 error message.
• If the packet with the destination being local and transport layer protocol being UDP and the
packet's destination port number does not match the running process, the device sends the source
a "port unreachable" ICMPv6 error message.
Command
system-view
ipv6 icmpv6 multicast-echo-reply
enable
Command
system-view
ipv6 hoplimit-expires enable
137
Remarks
N/A
Not enabled by default
Remarks
N/A
Optional.
Enabled by default.