3/19/2024 0 Comments What if a loopback ping fails![]() ![]() Linux and Windows are being "helpful" here, however from my chair answering a request that was sent to an address not assigned to this host is not correct behavior. This is ordinarily implemented using only 127.0.0.1/32 for loopback,īut no addresses within this block should ever appear on any network In order to reach the loopback IP, you must have some route to it via the Cisco device in question. A datagram sent by a higher level protocol to anĪddress anywhere within this block should loop back inside the host. On the logic behind this implementation, see RFC 3330:ġ27.0.0.0/8 - This block is assigned for use as the Internet host Ping: sendto: Can't assign requested ~]$ sudo ifconfig lo0 alias 127.1.1.1 netmask ~]$ ifconfig lo0Ħ4 bytes from 127.1.1.1: icmp_seq=0 ttl=64 time=0.020 ms PING 127.1.1.1 (127.1.1.1): 56 data bytes No, I actually had the loopback interface set for 10.0.33.254 - the last device on the same class-C level subnet (the mask is 24 bits) as the client doing the pinging. Im trying to configure loopback interfaces on (2) 3560 Multilayer switches that i can ping from any computer. If you suspect that your NIC is not working on a physical level, this makes a very good test. into a command prompt with admin privileges, try checking it before and after a successful ping attempt to see if ARP is being cached properly. When you do this you are testing to make sure that your information can go down to layer 1 and back up. If this keps happening every time you ping the same address, there might be a problem with your ARP cache, either its corrupt or missing, or windows cannot access it properly. Inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3 When you test your NIC, this can be done via 'ping 127.0.0.1'. ![]() I have shared my Wifi LAN connection to the MS loopback adapters. Then block this google surfing in ASA and then the user would find a way to use again. ![]() My target is to Use Google from Cloud-1 Local area connection PC to ISPs Local area connection 2. FreeBSD (also OS X, and I believe NetBSD & OpenBSD) will respond to requests sent to configured addresses on the loopback interface, just as they would for addresses on any other interface - If you want an answer you need to assign the address first: ~]$ ifconfig lo0 Ping Fail from R2 to ASA inside 10.1.1.254/24, and R1s 10.1.1.1/24. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |