![]() ![]() ![]() ![]() The following example shows valid IP address configurations on two loopback interfaces. Data packets sent on a loopback address are re-routed back to the orginating node without any alteration or modification. Up to thirty-two IP addresses are supported on a loopback interface. Loopback Address: A loopback address is a type of IP address that is used to test the communication or transportation medium on a local network card and/or for testing network applications. It won't work Let's look at PC1: Its IP address is 10.10.10.1, its netmask is /24 or 255.255.255.0 This means that as far as it is concerned, IP addresses in the rage of 10.10.10.0 - 10.10.10.255 are in the same subnet. enable interface Vlan1 no ip address interface Vlan400 description LegacyData ip address 10.10.1.100 255.255.0.0 ip pim dense-mode interface Vlan911 description MGMT.Network ip address 10.12.254.254 255.255.255. You can configure multiple IP addresses on a loopback interface ( lo0 to lo7). The PC should now be able to ping the 1841s loopback IP, 192.168.255.1. Cannot ping IP on different subnet Options. In the same way, if you configure a loopback interface ( lo1) with IP address 172.16.101.8, you cannot configure another loopback interface ( lo2) with IP address 172.16.101.8. This means that the address cannot be used by a VLAN interface or another loopback interface.įor example, if you configure a VLAN with IP address 172.16.100.8/24, you cannot configure a loopback interface with IP address 172.16.100.8. 0.0.0.0, on the other hand, is more of a wildcard than a specific location. As such, youll typically enter it when telling the software to connect to a server either via a web browser or a game. Now is that ping different from normal ping. 127.0.0.1 is a signal to your computers TCP/IP that you dont want to connect to the internet you want to connect to a server on your own computer. The maximum number of IP addresses supported on a switch is 2048, which includes all IP addresses configured for both VLANs and loopback interfaces (except for the default loopback IP address 127.0.0.1).Įach IP address that you configure on a loopback interface must be unique in the switch. I have seen the lab for CCNP ROUTE exam it stataes that you must aable to ping and telnet from loopback interface 101 on R1 to ip address like 172.1.1.1. You did not explain what is the IP address of the loopback on your Catalyst 2960 but I assume that it is in a different subnet than 10.0.33.0/24 (just as it should be). ![]() Make those rules immediately accept packets without. When your mangle rules set the routing mark User-Irancell on the packets (by matching their source address), this has priority over local subnet routes that are in the main table (and this is generally the whole point of routing marks). Otherwise the the 5.5.5.0 or 6.6.6.0 networks will never make it across to the correct router.You can configure a loopback interface only from the CLI you cannot configure a loopback interface from the WebAgent or Menu interface. Loopback interfaces are virtual interfaces that are considered directly connected interfaces. Your 'routing mark' configuration does this. Success rate is 100 percent (5/5), round-trip min/avg/max = 0/0/0 msĪlso - as a note - when using RIP, you will need to advertise both 5.5.5.0 and 192.168.1.0. Packet sent with a source address of 6.6.6.6 Sending 5, 100-byte ICMP Echos to 5.5.5.5, timeout is 2 seconds: Packet sent with a source address of 5.5.5.5 Network B needs to use 192.168.0.0 /26, which yields 64 host addresses. Explanation: Network A needs to use 192.168.0.128 /25, which yields 128 host addresses. Sending 5, 100-byte ICMP Echos to 6.6.6.6, timeout is 2 seconds: I know this is an older post but, I was working on a lab using VRF in that specific instance, you can have the same IP address on two separate interfaces within the same router. Match the network with the correct IP address and prefix that will satisfy the usable host addressing requirements for each network. Loose, Strict, Record, Timestamp, Verbose: But I am still answering the question.įill out the form & at the Extended commands choose/type Y and enter the source address OK - I know that this is over six years OLD and I know that it is probably answered 100 times elsewhere. ![]()
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