What do you do if you are unable to establish the connection to the home server?
Making sure to use https and secure file transfer services negates much of the danger of open WiFi as long as you protect yourself from MITM attacks.
The free version of XArp is sufficient for most users.
I have access to multiple VPN servers, we have several setup at my workplace for example, however the home VPN is nice due to remote access to some of my files. No disputing the ease of using Xarp for Windows but unfortunately it doesn't appear to support OSX. I've never used Xarp before but it just may prove very simple to use.
Using HTTPS is fine but not all sites support it. Unless you have specific sites that you visit that guarantees you a SSL connection, it's only a matter of time before you are forced out of HTTPS into a typical port 80 connection. The VPN configuration I use is all free, the proxy configuration software is also free, readily available to anyone who wants to use it all using a dynamic ip without resorting to using Dyndns.com
TBH I'm not a whole lot worried about ARP attacks, to do so the attacking computer would have to be equipped with a network adapter capable of injection, and many built-in wireless chipsets included in most laptops aren't capable of it. I'm very aware of the most common adapters used since my old Kismet and Backtrack 2 days.
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