Lab Environment:650) this.width=650; "alt=" Cisco Packet Tracert Spanning tree understanding-Ibm.chick-mingkang.zhou "src=" Http://img1.ph.126.net/-OTBVD6L D8mmccic2uxrbg==/6630564189373643902.png "style=" border:0px;height:auto;margin:0px 10px 0px 0px; "/>Experimental Purpose:1. Simple description of Spanning tree.2. Observe that a switch belongs to the root bridge.3, observe the switch is not the root bridge, the port is "blocked".4. Set the port of
Route tracing online tracert tool description
Tracert (tracking Routing) is a practical routing tracking function.ProgramUsed to determine the path of the IP datagram access target. The tracert command uses the ip ttl field and the ICMP error message to determine the route from one host to other hosts on the network.How trac
) ip addresses is 9.
-K computer-list
Route data packets using the computer list specified by computer-list. The maximum number of ip addresses allowed by consecutive computers to be separated by intermediate gateways (strictly source routes) is 9.
-W timeout
Specify the timeout interval, in milliseconds.
Destination-list
Specify the remote computer to be pinged.
C: //> ping ds.internic.net
Pinging ds.internic.net [192.20.239.132] with 32 bytes of data: (192.20.239.132 his IP address)
Reply from
Difference between traceroute and tracertRecently, when reading the TCP/IP details Volume 1, the traceroute and tracert commands gave me a small pitfall. The two were originally different.I captured packets under windows, but I still cannot catch udp packets ....I also reminded myself that it was time to read a book !!!Both are used to detect the IP addresses that route data packets from the source to the destination, but the methods used to detect da
, but directly discard it and send a notification to the source address of the packet, saying that the packet has failed to be transmitted. Each operating system may have different TTL initial values. If you want to view the initial values, you can use the ping command to simplify the process:
Ping 127.0.0.1
Ping your own loop address. In this case, the ping packet will return directly, so the TTL value will not be reduced, so the initial value of TTL will be obtained.
Ping, tracert, traceroute, and netstat command to view the ubuntu running status command 1. route to view and set the route information for Linux 2. ping: network connectivity check example: ping 192.168.0.1 parameter:-c is used to specify the number of ping responses. Example: ping-c 4 192.168.0.1 the specified number of responses is 4 3. traceroute is used to analyze the network topology format: traceroute Remote Host IP address or domain name 4. ne
DatagramCaptured), we can seeTracertCommand is how to use the ip ttl field and ICMP error message to determine the route from one host to other hosts on the network. The TTL (Time to Live) field of the IP packet header is an 8-bit field initially set by the sender. It indicates the effective Time of the packet, that is, the life cycle. For eachVroThe TTL value must be reduced by 1 or less the number of seconds that the datagram stays in the vro.
Because the latency of most vro-forwarded data pac
TracertCommand asRoutingThe tracing and diagnosis utility has this command in DOS and Unix systems. It sends an Internet Control Message Protocol (ICMP) echo request and an echo response message, generate command line report output for each vro to track the path. This program is one of the necessary TCP/IP tools for network management. It is often used to test network connectivity and determine the fault location. Therefore, it is necessary for us to fully understand the running process of
Run the tracert command to track the IPv6 path, open the "command prompt", and then type tracert-d-6 HostName or tracertIPv6Address % ZoneID, where HostName is the host name of the remote computer. IPv6Address is the IPv6 address of the remote computer. ZoneID is the region ID used for the target address ). The Region ID used for the link's local destination address is the interface index of the interface f
I. Overview:
By default, ASA does not respond to TTL exceeded packets, so Traceroute/tracert does not see the ASA device, and Traceroute/tracert cannot traverse the firewall because of firewall policy restrictions.
Two. Basic ideas:
Depending on how the Traceroute/tracert is handled, determine why it is not possible to traverse the firewall, thereby releasing
How the TRACERT command works The TRACERT diagnostic utility determines the route used by the Internet Control Message Protocol (ICMP) echo packets to target destinations to which different IP time-to-live (TTL) values are sent. on each router on the path, it takes at least 1 TTL on the packet to forward it, so the TTL is valid before the hop count. when the TTL on the packet arrives 0 o'clock, the router
TRACERT command IntroductionThe TRACERT command uses the IP time-to-Live (TTL) field and the ICMP error message to determine the route from one host to another host on the network.Command format:tracert [-d] [-h maximum_hops] [-j host-list] [-W timeout][-r] [-S srcaddr] [-4] [-6] Target_name-d Specifies that the address is not resolved to a computer name.-h maximum_hops Specifies the maximum number of hops
one end to the other through transmission media and devices (routers, switches, servers, gateways, etc.) in many segments in the network. Each device connected to the Internet, such as a host, router, or access server, usually has an independent IP address. With traceroute, we can know the path from your computer to the host on the other end of the Internet. Of course, the path for each packet to arrive at the same destination from a certain source may be different, however, most of the time th
Development background:Prior to an internship in an IDC company, responsible for server aftermarket, often use ping,tracert,tcping and other commands to do some preliminary diagnosis, to determine the server problem in what aspect. So I want to integrate these common commands or tools into a GUI interface, implement one-click Call. (PS: Of course the company has better integration tools, I just imitate the company's)Development environment:Win 7 64-bi
Similarly, today I accidentally discovered --#
Simulate the code locally.
Explanation: the first statement echo the submitted content and the second statement executes the tracert command and returns
Since it is the URL that tracert wants to track, it is not possible to tracert 0.0.0.0 net user. Of course, the result will not work, because the browser will
, node type, and so on.
The physical address of the network adapter is useful when detecting network errors.
The ipconfig command format is as follows:
ipconfig [/? |/all |/release [Adapter] |/renew [Adapter]]
The parameters are described below:
/? An English description of the format and parameters of the ipconfig display;
/ALL Display all the configuration information;
/release Free IP addresses (DHCP only) for the specified adapter (or all adapters);
/renew updates the IP address for the spec
The tracert command format is as follows:
1. tracert [-D] [-H maximum_hops] [-J host-list] [-W timeout] target_name parameters are described as follows:
-D does not parse the host name;
-H maximum_hops specifies the maximum number of rounds to search for the target address;
-J host-list: Release the source route along the host list;
-W timeout specifies the timeout interval (in milliseconds ).
I
traceroute the principle of:1.traceroute host to be Trace Host Send UDP The destination port is a port with a large number (for example, 33434 Port)2. First package ttl= 1 Span style= "Font-family:simsun;" lang= "ZH-CN" xml:lang= "ZH-CN", dport=33434 ; future packet ttl 1 3. How to determine that you have reached your destination,general destinations are not UDP 33434 this large port to open what services, then the packet reached the destination, the purpose of discovering that the l
Lab Environment:650) this.width=650; "alt=" Cisco Packet Tracert three-tier switch VLAN configuration-Ibm.chick-mingkang.zhou "src=" Http://img2.ph.126.net/2N Qfixjyba1gdiqtbuknhq==/6630601572768576164.png "style=" border:0px;height:auto;margin:0px 10px 0px 0px; "/>Experimental Purpose:1, the three layer switch divides three VLANs, is Vlan2\vnal3\vlan4, and the VLAN IP is set to: 192.168.2.1, 192.168.3.1, 192.168.4.1 respectively.2, the FA0/1 port is
Lab Environment:650) this.width=650; "alt=" Cisco Packet Tracert three-tier switching DHCP service-Ibm.chick-mingkang.zhou "src=" Http://img0.ph.126.net/tag 7vac5pybsnfocl_bnga==/6630314600233973070.png "style=" border:0px;height:auto;margin:0px 10px 0px 0px; "/>Experimental Purpose:1, in the three-layer switch division vlan100\vlan200, and the FA0/1 and FA0/2 respectively divided into VLAN100 \vlan200.2. Create a pool of IP addresses for each VLAN on
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