DHCP Server

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DHCP
IP address
we made a scope on range of 173.0.0.1 to 173.0.0.200 now a client got an IP 173.0.0.180 after sometime we edit the scope propertie and reduce the range to 173.0.0.1 to 173.0.0.150 what will be happen? do the previous IP 173.0.0.180 will work?if yes how? can we renew it ? if no Why?

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The previous lease of 173.0.0.180 will attempt to renew at 1/2 of lease time. Since that address is no longer part of the scope, the device will get assigned a new address. If this is a Windows device, open a command window and type <b>ipconfig /renew</b> to get an address in the new range. Unless the subnet mask has changed, the 173.0.0.180 address should still be able to communicate on the network.

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I agree with everything except the last statement, because if the new IP is not in the DHCP anymore then it should not be able to get out, or to anything on the network, you would have to renew the IP address on that machine before it could do anything.

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Labnuke99 is right. The computer will still be able to communicate on the network if there were no other changes. About half way through the lease, the machine would request a new IP address and renew in the correct range.

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  • carlosdl
    I have to disagree with Securityn00b12. The fact that the IP address is not in the DHCP anymore, has nothing to do with the ability of the device to communicate with other devices on the network. DHCP provides the network configuration. Nothing more. If a device has an appropriate address and subnet mask, it can communicate with others, no matter how it got that configuration.
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  • Shirzai
    That is correct. Sometimes Windows can hold a "sticky" DHCP address that is very difficult to renew no matter what. In cases like that, you sometimes have to set a static IP and then restart and then set to DHCP to get a dynamic address.
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