LIMPIAR IP CONFLICT CISCO
DHCP conflict logging: the true story The on-line configuration help for the ip dhcp conflict logging configuration command ( logging: Record address conflicts in a log file ) is one of the more misleading texts I've found in Cisco IOS (and the CCO documentation is not much better). Here's how it actually works ... If you have configured ip dhcp ping parameters (highly recommended), the router will ping the IP address it intends to allocate to a client before replying to the DHCP request. If the router receives ICMP Echo Reply message (response to ping), the address is obviously in use. If the DHCP conflict logging is enabled (default), the router will log the conflict with a syslog message (not in a separate log file) and put the address on the list of conflicts. The addresses on that list (displayed with show ip dhcp conflict ) are not used in the future (similar to the addresses configured with the ip dhcp excluded-addresses command). To reuse a conflictin...