Topic: IP Services
Configure r1 to see all possible logs to a server with the IP address of 10.1.1.100.
r1#show ip arp 10.1.123.100
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.1.123.100 1 0000.5e00.0101 ARPA FastEthernet0/0
What can we tell about the IP address 10.1.123.100 from this output?
Answer: 10.1.123.100 is a VRRP Virtual IP address in VRRP group 1…or it’s being spoofed :-).
The MAC address 0000.5e00.0101 signifies that a VRRP virtual MAC address. The ‘0000.5e00.01’ section signifies a VRRP MAC address. The last two hexadecimal characters represent a VRRP group number from 1 (01) to 255 (ff).
FastEthernet0/0 – Group 1
State is Master
Virtual IP address is 10.1.123.100
Virtual MAC address is 0000.5e00.0101
Advertisement interval is 1.000 sec
Priority is 100
Master Router is 10.1.123.1 (local), priority is 100
Master Advertisement interval is 1.000 sec
Master Down interval is 3.609 sec
As I mentioned, this could also be a spoofed address. 🙂
description ->r1 f1/0 22.214.171.124/30
ip address 126.96.36.199 255.255.255.252