![]() In addition, check the subnet mask to ensure that a remote address has not been interpreted as a local address. The loopback address has a default IP (127.0.0.1) useful to test programs on your computer, without sending information over the internet. To ping the loopback interface on your system to troubleshoot the problem, follow these steps: At the command line, type these commands: For IPv4: PING 127.0.0. ![]() If the remote routing tables are correct and contain a valid route back to the sending host, use the arp -a command to determine whether the correct address is listed in the ARP cache. A good way to think of localhost, in computer networking, is to look at it as this computer.It is the default name used to establish a connection with your computer using the loopback address network. Most often, it indicates that a route back to the sending host has failed, because the destination host, one of the intermediary routers, or the default gateway of the destination host does not recognize the route back to the sending host.Ĭheck the routing table of the destination host to determine whether it has a route to the sending host before checking the routing tables of the individual routers. This message may be the result of network congestion, failure of the ARP request, packet filtering, a routing error, or a silent discard. The loopback device is a special, virtual network interface that your computer uses to communicate with itself. To test whether the TCP/IP stack is properly implemented on the local system, you can send a ping request to the loopback interface. When I am executing command sh ip bgp, getting Routes to R1 loopback, but I am unable to ping the loopback ip. Configured Loopback in all the routers and advertise in BGP. Indicates that no “Echo Reply” messages were received within the default time of one second. I have configured BGP on all the routers are R1 and R3 & R3 and R4 are the neighbor of each other. Sorry I don’t have time to research further, but Help in 2000 + Microsoft Knowledge Base should be able to provide the rest of what you need to do. I think you may have a packet filtering problem.
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