544 CHAPTER 47: IPV6 APPLICATION CONFIGURATION
Figure 194 Traceroute process
As Figure 194 shows, the traceroute process is as follows:
■ The source sends an IP datagram with the Hop Limit of 1.
■ If the first hop device receiving the datagram reads the Hop Limit of 1, it will
discard the packet and return an ICMP timeout error message. Thus, the source
can get the first device’s address in the route.
■ The source sends a datagram with the Hop Limit of 2 and the second hop
device returns an ICMP timeout error message. The source gets the second
device’s address in the route.
■ This process continues until the datagram reaches the destination host. As
there is no application using the UDP port, the destination returns a "port
unreachable" ICMP error message.
■ The source receives the "port unreachable" ICMP error message and
understands that the packet has reached the destination, and thus determines
the route of the packet from source to destination.
IPv6 TFTP IPv6 supports TFTP (Trivial File Transfer Protocol). As a client, the device can
download files from or upload files to a TFTP server. For details about TFTP, see File
System Management.
Configuration preparation
Enable TFTP on the TFTP server and specify the path to download or upload files.
For specific operations, refer to TFTP server’s configuration specifications.
IPv6 TFTP configuration
You can use the commands listed in Table 402 to download files from a TFTP
server or upload files to a TFTP server.
Tabl e 401 Traceroute IPv6
To do... Use the command... Remarks
Traceroute IPv6 tracert ipv6 [ -f first-ttl | -m max-ttl | -p
port | -q packet-num | -w timeout ]*
remote-system
Required
Available in any view
RTA RTB RTC RTD
Hop Limit=1
Hop Limit exceeded
Hop Limit = 2
Hop Limit exceeded
Hop Limit = n
UDP port unreachable
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