Valid_lft forever preferred_lft thought that the 169.254.0.0/16 range was used for link local - but you can modify the above as needed. When you have a Layer 3 switch, like a Catalyst 4500,6500,3550 or 3750, to configure loopback interface from the config mode, complete these steps: Switchconfigure terminal. The loopback address is the reserved network interface that is used by the local machine. Inet 169.254.255.254/24 brd 169.254.255.255 scope global lo:0 The management vlan of the switch acts like the loopback interface since they are both logical interfaces. In Example 51, the IPv4 address 127.0.0.1 is the loopback address. We have done that and that configuration works fine. its like duplicate address we need to ping particular network. Link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 You would need to do a management VPN tunnel to be able to poll loopback IP addresses. loopback is use for testing purpose its a cisco catalyst the loopback address is 127.0.0.0. Specify the loopback interface IP address. Right-click TCP/IP Configuration, and select Utilities > Ping. The resulting IP address on lo becomes: ip addr show dev loġ: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1 In System i Navigator, expand your system > Network. etc/network/interfaces: # This file describes the network interfaces available on your system You might be able to write out your address with mask in the interfaces file, but I used the traditional notation with address, netmask and network. A CVI loopback IP address is used for loopback traffic that is sent to the whole cluster. The Wikipedia Page has good information on it.I think you were very close! To accomplish the lo addressing they way you are looking you might have to use a : notation. A loopback interface is a virtual interface that can be created on any Layer 3 device such as a router, 元 switch, or firewall. This is also known as a localhost address. IP addresses within this range, such as 127.0.0.1 for example, can be used by a host to refer to itself. One is the loopback address block of 127.0.0.0/8, as defined in RFC 5735. I don't know if I explained it very well, but it was the best I could do. Now, I am restarting the PC, my expectation is that the port 9876 should listen in the same ipv4 static address(ex: 123.87.98.187). Loopback address This term has been adopted in IP networking in several ways. This would provide the information to local applications, while disabling the ability for somebody else on a LAN to access whatever server software you set up as local. You can specify the server software to transfer information via the loopback address and your client software could listen in on the loop back address. Loopback IP address is managed entirely by and within the operating system. This can be seen when you have a server-client model application installed on the local computer, but you do not want that information to be accessible remotely. The IP address range 127.0.0.0 127.255.255.255 is reserved for loopback. It can also be used to specify to your applications that you do not want your information to leave the host computer. Users can specify an IP address, usually 127.0.0.1, which will point back to the computers TCP/IP network configuration. If you suspect that your NIC is not working on a physical level, this makes a very good test. When you do this you are testing to make sure that your information can go down to layer 1 and back up. When you test your NIC, this can be done via "ping 127.0.0.1".
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