Practice testing a loopback address by entering commands in Figure 2. The ping command is only showing the first reply it gets, in your case your own PC (127.0.0.1 is loopback) was the quickest. This successful ping request verifies that the network interface card, drivers, and the TCP/IP implementation are all functioning correctly. 255.255.255.255 is a broadcast address, you are sending a ping to every device on your local network and you will get a reply from every device. The result indicates that four test packets of 32 bytes each were sent and returned from host 127.0.0.1 in a time of less than 1 ms. Minimum = 0ms, Maximum = 0ms, Average = 0ms Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),Īpproximate round trip times in milli-seconds: The reply from this command would look something like this: Ping commands are entered into a command line on the local host using the syntax: If you turned off IPv6 it would go to the IPv4 address. I think Windows preference is to use IPv6 where possible, which is why localhost defaults to the IPv6 resolution. The loopback address, 127.0.0.1, is defined by the TCP/IP protocol as a reserved address that routes packets back to the host. Hostnames can resolve to both IPv4 and IPv6 addresses. Your server name must have its correct IP address in it. You need to have your server name in the hosts file as well as localhost. If memory serves me correctly, Oracle uses 'localhost' to communicate to the listener. Then, ping the IP address to see if it works this time. When you ping a hostname the first place it looks is the /etc/host file and will use the first match it gets. Press Ok in both windows to save the applied changes. To check for your router’s default gateway, you can refer online or simply check the device’s sticker. This test is accomplished by using the ping command on a reserved address called the loopback (127.0.0.1). In the properties window, find the Default Gateway tab and set the correct IP. The ping command is used to verify the internal IP configuration on a local host. Perhaps the original poster can clarify the reasons that they chose to implement loopback interfaces on layer 2 switches.The figure shows the first step in the testing sequence. If you are testing by using the host name, you must select the Protocol for host names. The reason is that in iBGP the next-hop is not changed but preserved so a remote router iBGP speaker would see something like. Specify the loopback interface IP address or host name. Advertising a loopback interface in iBGP is not forbidden but it does not solve the issues of making that loopback 'reachable' by other devices. Right-click TCP/IP Configuration, and select Utilities > Ping. I think that they would be as well off (and configuration would be more simple) to have remote management use the VLAN 1 interface address as a loopback address. In System i® Navigator, expand your system > Network. But in this situation there is only a single layer 3 path and they are entirely dependent on the operation of the VLAN 1 interface. Loopback interfaces have a real advantage when there is more than 1 layer 3 path to the device. It just complicates things and I do not see any real advantage in it. My opinion is that if they want to operate the access switches as just layer 2 switches, that there is no real advantage in configuring loopback interfaces. But I think that you did well to demonstrate a way to get it to work. Whether it is fair in terms of the original question would depend on the full environment of the original question which we do not know. The local IP address is on one of your other network interfaces. The two are on different 'interfaces' - the lookback address is on the loopback interface which should be present always (unless you've done something really freaky with your config). I would say that what you did is quite fair as a way to find what works. 3 Answers Sorted by: 2 When everything is working correctly, they should have the same effect. Based on the symptoms described I am guessing that they have not provided static routes in the core for the access switch loopbacks, which you did. Then we would know better what they are trying to do. As I said in my post: seeing configs would help.
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