how to use traceroute

Time exceeded message, as it is already the destination, so traceroute how to know the destination arrived. Traceroute when sending a UDP datagrams to a destination, the port number that it chooses to deliver is one that the general application will not use (more than 30000), so when the UDP datagram arrives at the destination, the host sends back a "ICMP The me

Traceroute working principle Traceroute the simplest basic usage is: The traceroute hostname Traceroute program is designed To use the TTL (Time To Live) field (field) of ICMP and IP header ). First, traceroute sends an IP datasyn

sends the packet directly to the remote host.-S sets the IP address of the local host to send the packet.-T sets the value of the TOS for the detection packet.-V shows the execution of the instruction in detail.-W Sets the time to wait for the remote host to return.-X turns the correctness of the packet on or off. **4 instances:Example 4.1**: Traceroute www.baidu.com DescriptionRecord by serial number starting from 1, each record is a hop, each hop r

Traceroute transmits packets with small TTL (time to Live) values.The TTL is an IP header field , which is used to prevent packets from running into endless loops. When a router this handles the packet subtracts one from the packet ' s TTL. The packet expires and it ' s discarded when the TTL reaches zero.Traceroute sends ICMP time Exceeded messages, (RFC 792), when the sender is this occurs. By using small TTL values, the packets would quickly expire

The Traceroute program allows us to see the routes that the IP datagram passes from one host to another, and can use the IP Source Station routing option.Traceroute the reason for replacing IP RR 1 not all routers support the IP RR option, while the Traceroute program does not require any special or optional functionality from the intermediate routers. 2 record r

also gives us a chance to view the route from the host to the target host. This is because, when the ICMP ping request datagram passes through a vro, The vro will put its own IP address in the report. The target host will copy the IP address list to the host in response to the ICMP packet. However, in any case, the list of routes that the IP header can record is very limited. To observe routing, we still need to use a better tool, that is,

traceroute how to know the destination arrived.Traceroute when sending a UDP datagrams to a destination, the port number that it chooses to deliver is one that the general application will not use (more than 30000), so when the UDP datagram arrives at the destination, the host sends back a "ICMP The message of Port unreachable", and when Traceroute received the

gateway responds after a probe packet sends three packets to each gateway, and if you use Traceroute-q 4 www.58.com, 4 packets are sent to each gateway.Sometimes when we traceroute a host, we see that some of the rows are represented by asterisks. In this case, it is possible that the firewall has blocked the return information of ICMP, so we have not got any re

packets whose t l field is 0 ). On the contrary, the router discards the datagram and sends an I c m p "timeout" message to the source machine. Traceroute: it sends an I p datagram with t l field 1 to the target host. The first router that processes this data packet minus the t l value by 1, discards the data packet, and returns a timeout I c m p packet. In this way, the address of the first vro in the path is obtained. Then the

, such as sf.net, if you are interested. Then you can see packet loss, the program runs for a longer time.Ping also gives us a chance to view the route from the host to the target host. This is because, when the ICMP ping request datagram passes through a vro, The vro will put its own IP address in the report. The target host will copy the IP address list to the host in response to the ICMP packet. However, in any case, the list of routes that the IP header can record is very limited. To observe

us a chance to view the route from the host to the target host. This is because, when the ICMP ping request datagram passes through a vro, The vro will put its own IP address in the report. The target host will copy the IP address list to the host in response to the ICMP packet. However, in any case, the list of routes that the IP header can record is very limited. To observe routing, we still need to use a better tool, that is,

reported by the router to put its own IP in the datagram every time it passes through a router. The destination host copies the IP list back to the host in response to the ICMP packet. However, in any case, the list of routes that the IP header can record is very limited. If we want to observe the route, we still need to use a better tool, that is, Traceroute (the name under Windows is called tracert).Appl

The previous two articles "Linux Common Network Tools: Fping host Scan" and "Linux common Network Tools: hping Advanced Host Scan" are all about the host scan, this article introduces the common route scanning tools traceroute and MTR.A route scan is primarily a query for the number of hops and data delays that are routed to another host.Traceroute Basic Use The principle of the route scanning tool is

install! [Plain]View plaincopyprint? Sudo apt-get install traceroute As shown in, after the screen is flushed quickly, it is only 51 kb because of this route tracking component. You can officially use the traceroute command in Linux. Run the following command to test the communication details between Ubuntu12.04 and www.csdn.net, [Plain]View plaincopyp

echo and ICMP echo reply packets to detect the presence of the host, so the process of pinging is simple: sending ICMP echo packets----> receiving ICMP Echo reply packets)Ping gives us a chance to see the host's route to the destination host. This is because the ping request datagram for ICMP is reported by the router to put its own IP in the datagram every time it passes through a router. The destination host copies the IP list back to the host in response to the ICMP packet. However, in any c

from the host to the target host. This is because, when the ICMP ping request datagram passes through a vro, The vro will put its own ip address in the report. The target host will copy the ip address list to the host in response to the icmp packet. However, in any case, the list of routes that the ip header can record is very limited. To observe routing, we still need to use a better tool, that is, Traceroute