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Difference between revisions of "DHCP Log"

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If the imRAD does not receive messages from clients, none of logs from the clients are recorded.
 
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.
 
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" or "DHCP helper".
+
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.
 
The imRAD keeps only today's postDHCP log, which means all logs are cleared at every 0 o'clock.
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| DHCP Server || The imRAD IP address that records the log.
 
| DHCP Server || The imRAD IP address that records the log.
 
|-
 
|-
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| Helper IP Address || DHCP 클라이언트의 요청을 전송한 Helper(L3 스위치 혹은 라우터)의 IP 주소<br>
+
| Helper Address || The IP address of a DHCP helper which relays the DHCP clients messages to the imRAD DHCP server.<br>
−
(이 주소를 통해 클라이언트의 위치를 판단합니다.)
+
The DHCP server selects an available IP address in a DHCP pool by the IP address of the DHCP helper.
 
|-
 
|-
−
| 요청 형식 || DHCP 요청 형식
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| Request || One of the DHCP messages.
 
|-
 
|-
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| 요청 서버 주소 || DHCP 클라이언트가 요청 패킷 전송시 포함한 대상 서버 주소
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| Request Server Address || The request server IP address in the DHCP client message.<br>If the address is not the same as an imRAD's address, the system may not ack or reply to the client.
 
|-
 
|-
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| 요청 IP 주소 || DHCP 클라이언트가 요청 패킷 전송시 요청한 IP 주소
+
| Request Address || An IP address requesting by a client.
 
|-
 
|-
 
| 응답결과 || [[DHCP 처리 응답 결과]]를 참고하십시요.
 
| 응답결과 || [[DHCP 처리 응답 결과]]를 참고하십시요.

Revision as of 16:10, 8 March 2021

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
datetime The date and time at which a log was recorded.
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.
DHCP Server The IP address of one of imRADs.
Hostname DHCP client's hostname.
DHCP Pool The name of the DHCP pool.
DUID
IAID		 The DUID / IAID of the DHCPv6 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
datetime The date and time at which a log was recorded.
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.
응답결과 DHCP 처리 응답 결과를 참고하십시요.
VCID Vendor Class Identifier