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Sorry this might be a stupid question as I don't know the exact term to google. But this question has been in my mind for a while.

Let's assume machine A is the isc-dhcpd server with two interface. One private interface (eth0: 192.168.1.1) and one public interface(eth1: x.x.x.x). THe private interface have no access to internet, while the public interface can access the internet.

Now. I have a machine B without OS in the same network as Machine A. I want to use machine A to kickstart machine B. Machine A dhcpd is on interface eth0.

My question is, machine A will assigna private IP to machine B let's say 192.168.1.2. Machine B will use machine A as gateway, but machine A's 192.168.1.1 cannot access the internet to access OS files. HOw to resolve this issue?

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To achieve this, you need to make your server (Machine A) into a router. In this way, traffic from the private network can be routed to the public interface and visa versa.

There are many guides on how to do this depending on what OS/distro you are using but there is already a question answered on the SU sister site, Ask Ubuntu. How to set up a linux server as a router.

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You would need to configure computer A as a router using iptables or nftables. It is not enough to configure computer B with computer A as it's gateway. Computer A must know to forward those packets to its other interface.

Additionally, PXE is not a routable protocol. You must also configure computer A to be a PXE server, or at least configure computer A's DHCP server with a PXE helper address.

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