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I use PXE server in order to download kickstart and to install Linux. After installation I saw that /etc/resolv.conf was created with the IP of the PXE server.

Why there is PXE server IP address in resolv.conf?

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What are network parameters defined in kickstart config file (line starting with network). – pbm Mar 20 '12 at 19:57

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resolv.conf can be modified by your DHCP server, which often times may be the PXE server. You have a pre-configured resolv.conf it can still be modified by DHCP and overwritten or modified.

This link has a good explanation.

nixCraft: How To: Make sure /etc/resolv.conf never gets updated by DHCP client.

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