No Internet connection during a few minutes any time I start up my iMac

When I start my iMac up (ethernet connection), I have to wait about 3 or 4 minutes to be able to use a navigator, as there is no internet connection. I get messages like Time out or DNS failed etc... then after this time the Interne works.
I have no problem at all with my iPad and wifi.
Could you help?

The warranty entitles you to complimentary phone support for the first 90 days of ownership.
If you bought the product in the U.S. directly from Apple (not from a reseller), you have 14 days from the date of delivery in which to exchange or return it for a refund. In other countries, the return policy may be different. If you bought from a reseller, its return policy applies.

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