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DHCP Reservations Not Working

LawrenceReynolds

I have a Sophos UTM 220. We have four DHCP server scopes setup. 192.168.1.xx, 2.xx, 3.xx, 4.xx. The 4.xx server is designated as the guest network. We have setup network definitions for computers on the 1.xx, 2.xx, and 3.xx network. However when computers, that have a reservation on one of these networks, are turned on and log on they are getting an ip address on the guest network instead of their network definition ip address. Right now to prevent this we have to disable the guest network. Once disable the computers will get the proper ip address according to the network definition. Why is this happening? To fix it right now we are having to ipconfig /release and then ipconfig /renew. Then they get the proper ip address and work good. But later on they will once again get a ip address on the guest network. Not sure what is going on!! Please suggest.



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  • 0
    Are the static addresses assigned from outside the scope of your DHCP server instances? From the Built-in help/admin guide:
    "Add Static Mapping to New Host Definition
    ...
    IPv4 address: Change the IP address to an address outside the DHCP pool range.

    Note – When converting a lease to a static mapping you should change the IP address so that it is no longer inside the scope of the DHCP pool. However, if you change the IP address, the address used by the client will not change immediately, but only when it tries to renew its lease for the next time."
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  • 0 in reply to Scott_Klassen
    I created the static mappings from management/network definitions/add new network definition. I did not ever convert a lease to a static mapping via network services/dhcp/ip4lease table. This happens quite frequently but not on all computers at the same time. Most computers will get their assigned ip address but then others will get a guest network ip address instead of the assigned ip address.
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  • 0 in reply to Scott_Klassen
    I created the static mappings from management/network definitions/add new network definition. I did not ever convert a lease to a static mapping via network services/dhcp/ip4lease table. This happens quite frequently but not on all computers at the same time. Most computers will get their assigned ip address but then others will get a guest network ip address instead of the assigned ip address.
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