3com 4210 PWR 9-Port 3CR17341-91-ME User Manual

C

HAPTER

 47: IP

V

6 A

PPLICATION

 C

ONFIGURATION

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 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.

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.

You can use the commands listed in Table 402 to download files from a TFTP 
server or upload files to a TFTP server.

Table 401   Traceroute IPv6

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