But, because the network software demands a private network, the loopback device can be used as a pseudo device in the private network that doesn’t really exist. Just add a parameter -4 after your usual ping command: Ping srv01 -4. Where I have assigned the loopback adapter a network address is when I’ve deployed a multi-homed machine configuration in a colo where there isn’t really a network behind the machine. If you still want to see an IPv4 address of a remote device in the result of the ping command, use the command below: ping hostname -4. You can do so, but it still shouldn’t be accessible from a network. Anyone with a background or interest in networking will find it. The loopback address is typically used in the context of networking and provides a computer the capability to validate the IP stack. Note that what you describe in your original post (and wolfi’s follow up) might work, but is typically misleading and incorrect practice because the loopback device and interface in both Windows and Linux is completely different than the network-capable interface so should not be assigned a LAN address. The localhost also referred to as ‘the loopback address’ is used to establish an IP connection or call, to your own computer or machine. When you do this, then webpages are accessible by any one or more addresses you want to assign it (typically 127.0.0.x) but not accessible from the network.Ĭonversely if you bind your actual ethernet adapter (might be eth0 but today more likely a name related to your NIC hardware), then it’s accessible from the network but accessible using localhost or a loopback address. A common example and use (and mistake) is for example to bind your webserver to this loopback address. This loopback adapter should not be assigned any LAN address, because as a loopback adapter, its interface is visible and usable only on the machine itself. To see the properties of all your network adapters, including your loopback (typically called “lo”) run the following command ip addr The IPv6 standard assigns only a single address for loopback: ::1. However, they can be used to set up multiple server applications on the host, all listening on the same port number. In Linux, a loopback adapter is created automatically for you. The address 127.0.0.1 is the standard address for IPv4 loopback traffic the rest are not supported by all operating systems.
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