Any chance you can try your setup with a normal ethernet cable? I dont have any crossover cables and no local shops have them. I can get one online but it wont arrive until next week and cost $15 and there is no gaurentee it will fix it
I'm pretty content having gargoyle running as wifi ap as its working great and I notice my wired PC's are getting much faster downloads compared to when they went through gargoyle.
Unfortunately my internet connection hosts an important data server that I can't take offline so I couldn't test for you currently sorry.
https://lantisproject.com/downloads/gargoylebuilds for the latest releases
Please be respectful when posting. I do this in my free time on a volunteer basis.