![]() ![]() The source sends a packet with the TTL being 2. After the TTL times out, the first hop sends an ICMP Error message to the source, indicating that the packet cannot be forwarded. The procedure is as follows:Ī source sends a packet with the TTL being 1. Specifies the name or IPv6 address of a destination.Īssume that the initial TTL value of tracert packets is 1 and the number of tracert packets sent each time is 1. The value is an integer ranging from 1 to 65535, in milliseconds. If first-hop-limit is also specified, the value of max-hop-limit must be greater than the value of first-hop-limit. To change the maximum hop limit, specify this parameter. Usually, the max-hop-limit value is set to the number of hops that packets pass through. If max-hop-limit is also specified, the value of first-hop-limit must be smaller than the value of max-hop-limit. In this case, no ICMPv6 Time Exceeded message is sent to the source. ![]() If first-hop-limit is specified and the number of hops that a packet passes through is less than the specified value, the first-hop-limit value will be greater than 0 after the packet passes through all the nodes. When the Hop Limit value is reduced to 0, the packet is discarded, and an ICMPv6 Time Exceeded message is sent to the source. The Hop Limit value is set on the source and subsequently reduced by 1 each time the packet passes through one device. This field is similar to the TTL field in IPv4 packets. ![]() Specifies an initial hop limit of trace packets.Ĭarried in the IPv6 header, the Hop Limit field indicates the lifetime of an IPv6 packet and specifies the maximum number of devices through which the packet can pass. Table 1-2 Parameter description of the tracert ipv6 command The value is a string of 1 to 255 characters. Specifies the name or IPv4 address of a destination. The value is an integer ranging from 0 to 3600000, in milliseconds. If network quality is poor and the transmission rate is low, you can increase the parameter value to prolong the timeout period. If sending a trace packet to a gateway times out, an asterisk (*) is displayed. Specifies the length of time to wait for a reply. The value is an integer ranging from 1 to 65535. If network quality is poor, you can increase the parameter value to improve the probability of a trace packet reaching the destination. Specifies the number of trace packets to be sent in a traceroute test. The value is an integer ranging from 1 to 255. If first-TTL is specified, the value of max-TTL must be greater than the value of first-TTL. To change the TTL value, specify this parameter. Generally, the value of max-TTL is set to the number of hops that the packet passes through. If max-TTL is also specified, the value of first-TTL must be smaller than the value of max-TTL. ![]() In this case, no ICMP Time Exceeded message is sent to the source. If first-TTL is specified and the number of hops that a trace packet passes through is less than the specified value, the TTL value will be greater than 0 after the packet passes through all the nodes. When the TTL value is reduced to 0, the packet is discarded, and an ICMP Time Exceeded message is sent to the source. The TTL value is set on the source and reduced by 1 each time the packet passes through one device. Specifies the initial time to live (TTL) of trace packets.Ĭarried in the IP header, the TTL field indicates the lifetime of a trace packet and specifies the maximum number of devices that the packet can pass through. source-ip-address is the IP address of the local interface. Specifies the source address of trace packets. Table 1-1 Parameter description of the tracert command ![]()
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