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| Property | Description |
|---|---|
| release (numbers) | Release current binding and restart DHCP client |
| renew (numbers) | Renew current leases. If the renew operation was not successful, client tries to reinitialize lease (i.e. it starts lease request procedure (rebind) as if it had not received an IP address yet) |
Configuration
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Examples
Simple DHCP client
Add a DHCP client on ether1 interface:
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Now convert hex value 15 to decimal and you get IAID=21
Configuration
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Examples
Simple DHCPv6 client
This simple example demonstrates how to enable dhcp client to receive IPv6 prefix and add it to the pool.
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| Code Block | ||
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10:30:31 dhcp,debug,packet defconf received request with id 4238230732 from 0.0.0.0 10:30:31 dhcp,debug,packet secs = 3 10:30:31 dhcp,debug,packet ciaddr = 0.0.0.0 10:30:31 dhcp,debug,packet chaddr = 30:07:4D:F5:07:49 10:30:31 dhcp,debug,packet Msg-Type = request 10:30:31 dhcp,debug,packet Client-Id = 01-30-07-4D-F5-07-49 10:30:31 dhcp,debug,packet Address-Request = 172.16.16.120 10:30:31 dhcp,debug,packet Server-Id = 192.168.88.1 10:30:31 dhcp,debug,packet Max-DHCP-Message-Size = 1500 10:30:31 dhcp,debug,packet Class-Id = "android-dhcp-9" 10:30:31 dhcp,debug,packet Host-Name = "Galaxy-S8" 10:30:31 dhcp,debug,packet Parameter-List = Subnet-Mask,Router,Domain-Server,Domain-Name,Interface-MTU,Broadcast-Address,Address-Time,Ren ewal-Time,Rebinding-Time,Vendor-Specific 10:30:31 dhcp,info defconf assigned 172.16.16.120 to 30:07:4D:F5:07:49 10:30:31 dhcp,debug,packet defconf sending ack with id 4238230732 to 172.16.16.120 10:30:31 dhcp,debug,packet ciaddr = 0.0.0.0 10:30:31 dhcp,debug,packet yiaddr = 172.16.16.120 10:30:31 dhcp,debug,packet siaddr = 192.168.88.1 10:30:31 dhcp,debug,packet chaddr = 30:07:4D:F5:07:49 10:30:31 dhcp,debug,packet Msg-Type = ack 10:30:31 dhcp,debug,packet Server-Id = 192.168.88.1 10:30:31 dhcp,debug,packet Address-Time = 600 10:30:31 dhcp,debug,packet Domain-Server = 192.168.88.1,10.155.0.1,10.155.0.126 |
Configuration Examples
Setup
To simply configure DHCP server you can use a setup command.
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| Property | Description |
|---|---|
| add-relay-info (yes | no; Default: no) | Adds DHCP relay agent information if enabled according to RFC 3046. Agent Circuit ID Sub-option contains mac address of an interface, Agent Remote ID Sub-option contains MAC address of the client from which request was received. |
| delay-threshold (time | none; Default: none) | If secs field in DHCP packet is smaller than delay-threshold, then this packet is ignored |
| dhcp-server (string; Default: ) | List of DHCP servers' IP addresses which should the DHCP requests be forwarded to |
| interface (string; Default: ) | Interface name the DHCP relay will be working on. |
| local-address (IP; Default: 0.0.0.0) | The unique IP address of this DHCP relay needed for DHCP server to distinguish relays. If set to 0.0.0.0 - the IP address will be chosen automatically |
| relay-info-remote-id (string; Default: ) | specified string will be used to construct Option 82 instead of client's MAC address. Option 82 consist of: interface from which packets was received + client mac address or relay-info-remote-id |
| name (string; Default: ) | Descriptive name for the relay |
Configuration
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Example
Let us consider that you have several IP networks 'behind' other routers, but you want to keep all DHCP servers on a single router. To do this, you need a DHCP relay on your network which will relay DHCP requests from clients to the DHCP server.
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