DHCP > Log
Lease
The imRAD stores logs for assigned, released, expired, and declined IP addresses. These logs do not include reply for the "RENEW" and "REBIND" message but "DISCOVER-REQUEST-ACK(DHCPv4)" or "SOLICIT-REQUEST-REPLY(DHCPv6).
| Columns | Description |
|---|---|
| Lease Obtained | The date and time at which a client obtained the lease. |
| Lease Renewal | The last date and time at which a client extends its lease. |
| status | The status of IP address. |
| IP Address | The IP address that was assigned, released, expired, or declined. |
| MAC Address | The ethernet hardware address of the DHCP clients. |
| DUID IAID |
The DUID / IAID of the DHCPv6 client. |
| DHCP Server | The IP address of one of imRADs. |
| Hostname | DHCP client's hostname. |
| DHCP Pool Name | The name of the DHCP pool. |
| Lease Finished | The last date and time at which a client relinquished its address. |
| Finish-Cause | It indicates why the lease finished and is either released, expired, or declined. |
| Total Duration | It indicates how log a client remains its lease. |
| Repeat | The total number of DHCP request from a client. |
PostDHCP
The imRAD records the result of processing the requests of DHCP clients as the PostDHCP to notify why a client was not allocated an IP address. By default, it only displays the results of failure(recommended) and you can change the setting using the CLI to save all results(failure and success). The failure means that a DHCP server dose not reply to DHCP clients because of the specific reason . You can make sure what the failure means in the DHCP failure messages.
If the imRAD does not receive messages from clients, none of logs from the clients are recorded. In such a case, you must make sure that the requests from clients can be relaying to the imRAD. The layer 3 switch or router in the VLAN of clients relays the DHCP message to a DHCP server because clients broadcast the DHCP message. It is called "bootp-relay", "relay-agent", or "DHCP helper".
The imRAD keeps only today's postDHCP log, which means all logs are cleared at every 0 o'clock.
| Columns | Description |
|---|---|
| Start Datetime | The initial date and time at which a log was recorded. |
| Datetime | The latest date and time at which a log was recorded. If the same client fails for the same reason, it does not insert a new log but updates the "Repeat" count and the Datetime. |
| MAC Address | The ethernet hardware address of the DHCP clients. |
| Hostname | DHCP client's hostname. |
| DHCP Pool | The name of the DHCP pool for clients. If the name is "unknown", It means that server could not select a DHCP pool because of a reason . |
| DHCP Server | The imRAD IP address that records the log. |
| Helper Address | The IP address of a DHCP helper which relays the DHCP clients messages to the imRAD DHCP server. The DHCP server selects an available IP address in a DHCP pool by the IP address of the DHCP helper. |
| Request | One of the DHCP messages. |
| Request Server Address | The request server IP address in the DHCP client message. If the address is not the same as an imRAD's address, the system may not ack or reply to the client. |
| Request Address | An IP address requesting by a client. |
| Reply | One of the DHCP failure messages. |
| VCID | Vendor Class Identifier |