![]() ping command to send an ICMP Echo Request message to the loopback address. "specific-destination address" for the equivalent local IPĪddress of the host. This form of IP address is seldom encountered, however. Multicast destination is processed as if it had beenĪddressed to one of the host's IP addresses we use the term ![]() (3) the address for a multicast group of which the host isĪ member on the incoming physical interface.įor most purposes, a datagram addressed to a broadcast or (2) an IP broadcast address valid for the connected (1) (one of) the host's IP address(es) or An incoming datagram is destinedįor the host if the datagram's destination address field is: When a host sends any datagram, the IP source address MUSTīe one of its own IP addresses (but not a broadcast orĪ host MUST silently discard an incoming datagram that is See also Section 3.3.6 for a non-standard use of associated with each of the host's local IPĪddresses see Sections 3.2.2.9 and 3.3.1.1. MUST NOT be sent, except asĪ source address as part of an initialization procedureīy which the host learns its own IP address. This notation is not intended to imply that the 1-bits in an We now summarize the important special cases for Class A, B,Īnd C IP addresses, using the following notation for an IPĪnd the notation "-1" for a field that contains all 1 bits. Group membership isĭetermined dynamically using IGMP. Internet Engineering Task Force ĭynamically to transient groups. , while transient addresses may be allocated Add a router to the topology, connect one of its ethernet ports to the cloud and start the router. Add the loopback adapter from the configure dialog box of the cloud node. Permanent multicast addresses areĪllocated by the Internet Assigned Number Authority Open GNS3 by right clicking it and choosing Run as administrator, insert a cloud node into the topology, right-click select configure. That stands for a group of hosts, and may be either , while Class E addresses are reserved forĪ multicast (Class D) address is a 28-bit logical address ![]() Class D addresses are used for IP multicasting There are now five classes of IP addresses: Class A throughĬlass E. Thoughts on this one? And any thoughts on a good source to cite? A computer with a working NIC should be able to ping itself regardless of if it is plugged in or not, so connecting a cable wouldn't help in this situation. Likewise, the subnet would not effect the DHCP settings. The subnet wouldn't factor in, as the localhost address isn't affected by external network settings. Being unable to ping this address can be a symptom of a faulty NIC. 127.0.0.1 is the address for localhost and is used for testing purposes.The computer needs a static address set in DHCP.If a computer can't ping 127.0.0.1, what is the most likely reason?.So I am turning to the experts on this one. This question is in the Daily Challenge and, while it has a pretty decent success rate (79% currently), there is some discussion on how accurate the answer is and it seems like it's just the least worst instead of the best answer.
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