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ISCOM2600G-HI (A) Series Configuration Guide
12.12 Traceroute
12.12.1 Introduction
Similar with Ping, Traceroute is a commonly-used maintenance method in network
management. Traceroute is often used to test the network nodes of packets from sender to
destination, detect whether the network connection is reachable, and analyze network fault
Traceroute works as below:
Step 1 Send a piece of TTL1 sniffer packet (where the UDP port ID of the packet is unavailable to
any application programs in destination side).
Step 2 TTL deducts 1 when reaching the first hop. Because the TTL value is 0, in the first hop the
device returns an ICMP timeout packet, indicating that this packet cannot be sent.
Step 3 The sending host adds 1 to TTL and resends this packet.
Step 4 Because the TTL value is reduced to 0 in the second hop, the device will return an ICMP
timeout packet, indicating that this packet cannot be sent.
The previous steps continue until the packet reaches the destination host, which will not return
ICMP timeout packets. Because the port ID of destination host is not be used, the destination
host will send the port unreachable packet and finish the test. Thus, the sending host can
record the source address of each ICMP TTL timeout packet and analyze the path to the
destination according to the response packet.
Figure 12-12 shows principles of traceroute.
Figure 12-12 Principles of Traceroute
12.12.2 Configuring Traceroute
Before using Traceroute, you should configure the IP address and default gateway of the
ISCOM2600G-HI series switch.
Configure Traceroute for the ISCOM2600G-HI series switch as below.
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