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Network

Last Update vor 2 Jahren

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Control and configuration of DCHP operation

Customize the DHCP of a Wi-Fi router

Panos Alexopoulos

Last Update vor 2 Jahren

DHCP is a network management protocol for your router that gives separate IP addresses to each device that connects to it in any way, assigning the IP in priority order, depending on the time order in which the devices entered.

Sometimes, especially in business or crowded Wi-Fi networks, the problem of DHCP overload may arise, i.e. the phenomenon of so many IP addresses being assigned to devices connected to Wi-Fi that no more can be assigned.

Therefore, if you try to connect one or more HAM devices to a router with an already overloaded DHCP, then it is likely that the device will not be able to get an IP address and connect to the Internet.

Audit

1. Go to the DHCP tab in your router's configuration menu.

2. In the "DHCP Settings" section, you can see the range of IP addresses that your DHCP can distribute so that devices can access the Internet normally. Here, for example, 230 IP addresses can be distributed.

3. In the "DHCP Client List" section, you can see all the IP addresses that your DHCP has allocated, so that you can compare them with the number of available IPs you saw in the previous step.

  • If the devices that have been assigned IPs are so many that the DHCP cannot allocate others, then you will not be able to connect the particular HAM device.
  • In case the number of IPs allocated by DHCP is within the allowed limits, the problem of overload may have to be addressed in the "Lease Time" setting of IPs, i.e. the time an IP is reserved for a device from the moment it is received.

This can be a significant problem, for when the "Lease Time" of IPs is sufficiently long, an IP can be reserved for a considerable period of time without the device that reserved the IP in the first place being connected to the network.

Resolve

  • In the case of an overloaded DHCP, you can simply manually increase the number of IPs it can give, so that other devices are able to connect. Each DHCP has an IP upper limit that you will be allowed to increase. Here, for example, we're increasing the number from 230 to 260 IPs. 
  • In case the problem is still not resolved, the solution can come by reducing the IP "Lease Time". We suggest a maximum "Lease Time" of 120' for IPs.

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