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. to send the packets with the source IP address of the loopback interface. where w.x.y.z is the IP address you want to ping, and a.b.c.d is the source IP you wish to use. 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. You can PING with the source IP address of any interface configured in the router by using the following command format. It makes little sense to put a default route on the loopback interface, because the only place it can send packets to is the imaginary piece of wire. whatever you send to it is received on the interface. The only purpose of the loopback interface is to return the packets sent to it, i.e. You can do so, but it still shouldn’t be accessible from a network. The loopback interface is a virtual interface. 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. 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. will borrow the loopback 5 IP address to use it on the GigabitEthernet0/0 interface as a next hop for the neighbor. interface GigabitEthernet0/0 ip unnumbered loopback 5. A common example and use (and mistake) is for example to bind your webserver to this loopback address. On a point-to-point link, you dont always need an IP address on the routers interface but you must inform the router of this fact, using the ip unnumbered command. 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 In Linux, a loopback adapter is created automatically for you.
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