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I believe you are looking something like this Using Intel® Galileo as access point | Intel® Developer Zone
I’ve never tried to do this before but I guess you would need to use the hostapd package. You can download it from Index of /galileo following the instructions from Galileo Package Repo Configuration Instructions .
Some information on hostapd Hostapd - Gentoo Wiki
We are talking about having the board do what the router its Ethernet port is connected to here? I should explain further....
The board has on its bottom a Mini PCIe slot, typically used for an appropriate WiFi card, and indeed one is installed. That means that the board follows the steps outlined in "Make:Getting Started with Intel Galileo", which is a book by author Matt Richardson.
To make things work for my chosen card (WiFi) I would need to put on it the required firmware that is available from an outside source, (Outside of this Intel site) and run a series of sketches for the Arduino based code it understands away from its Yocto based Linux internals. And I have done that before, but not for what I am planning.
The board would then be serving IP addresses from its Ethernet (wired) to that other board via an ordinary crossover Ethernet cable.
That is what I am planning on doing.