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Questions tagged [loopback]

For questions about loopback interfaces on network devices. For instance, you want to configure routing on your layer 3 switch and for that you want to configure a loopback interface.

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Whats's the function of a loopback interface in routing protocols?

So I've got this task where I have to setup a virtual network with an OSPF routing protocol. I firstly ignored this loopback interface I had to configure on the routers since it didn't do any ...
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2answers
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Loopback Interface speed is 10 Mbps but Incoming and Outgoing Traffic is in Gbps

I am writing a script which mails interface data to network admin. For this I'm using LibreNMS and RRDTool to gather data. On inspecting one of the loopback interfaces, I found that the interface ...
12
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1answer
2k views

Under what circumstances are multiple loopback (127/8) addresses useful?

I made an app in java where a client sends ip-packets to a server via the looback-address 127.0.0.1. A really simple app just to test how things work. At first I thought If I created several client-...
2
votes
1answer
85 views

IP address that can not be reached from outside of device

I am sorry if this is a silly question, but I am developing an application that should connect to itself over sockets, but to make it secure it should only be reachable from local device. I believe I ...
1
vote
1answer
78 views

What's the relationship of a Router with its loopback interface in logic?

I have a Router1 with a loopback 0 connected to the Router2: the interface brief is bellow: Router1>show ip interface brief Interface IP-Address OK? Method Status ...
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0answers
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Does a loop back IP address not need to be assigned to a network interface, in order to communicate with? [duplicate]

ifconfig shows only one loopback address 127.0.0.1 and that it is assigned to network interface lo. ping 127.0.0.2 can receive packets back, even though 127.0.0.2 is not assigned to a (virtual) ...