To create a loopback interface, use the following command in a Cisco Router. losetup /dev/loop0 floppy.img Now lets make it EXT2 formatted. dd if/dev/zero offloppy.img bs512 count2880 Now, lets set it up for mounting. Floppy Disk Images With GRUB and EXT2 First, lets create an empty image. The command syntax to create a loopback interface is shown below. Loopback Device under Linux The linux loopback device can be used by root only, and needs to be enabled in the kernel before use. Loopback interfaces are treated similar to physical interfaces in a router and we can assign IP addresses to them. By default, router doesn’t have any loopback interfaces (loopback interfaces are not enabled by default), but they can easily be created.
#Loopback device software#
Loopback interfaces interfaces are always up and running and always available, even if other physical interfaces in the router are down.Ī loop back interface is a software interface which can be used to emulate a physical interface. Loopback interfaces are used as the termination points for Remote Source-Route Bridging (RSRB), and Data-Link Switching Plus (DLSW+). Under MS Windws the MTU of the loopback adpater is 4294967295 and under XP it was 32767. The loopback adapter uses 127.0.0.1 and must not be changed. There is no hardware and no swtiches involved with the lo adapter. A loopback interface is always up and allows Border Gateway Protocol (BGP) neighborship between two routers to stay up even if one of the outbound physical interface connected between the routers is down. The lo adapter is part of the TCP/IP stack. Loopback interface’s IP Address determines a router’s OSPF Router ID. A loopback interface is not a physical interface like Fast Ethernet interface or Gigabit Ethernet interface.Ī loopback interface has many uses. That's it - test the VIP connection to the Real Server.įor Windows Server 2008 you will need to disable the built in firewall (or manually change the rules).A loopback interface is a logical, virtual interface in a Cisco Router. Netsh interface ipv4 set interface "loopback" weakhostsend=enabled Netsh interface ipv4 set interface "loopback" weakhostreceive=enabled Netsh interface ipv4 set interface "net" weakhostreceive=enabled You should get an "Ok" after entering each of these two lines. Netsh interface ipv4 set interface "Local Area Connection 2" forwarding=enabled Netsh interface ipv4 set interface "Local Area Connection" forwarding=enabled
Next, you will configure the loopback adapter on the Windows 2008 server: Select Microsoft Loopback Adapter on the right side.Click on Device Manager in the upper-left.
#Loopback device install#
To add a non-ARPing adapter in Windows 2008 Service Pack 1, you will first need to install the loopback adapter on the Windows server:
#Loopback device how to#
Back to Knowledgebase How to add a non-ARPing loopback adapter in Windows 2008 SP1 for use with the Barracuda Load Balancer in DSR?Īll Barracuda Load Balancer models, all firmware versions