Fedora's firewall is slowing networking with the Realtek RTL8187.

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When I set up my LANs, I disable all of the internal client's firewalls, as they tend to cause issues with my LAN firewall... Of course, my LAN firewall is set up with egress filtering, meaning that I don't have any open ports that I don't need... everything is blocked by default, unless it's a port that I need to have a connection to the outside world. I also have the firewall setup to shoot me an email of any connected client's MAC that is trying to connect via any unauthorised ports, etc, that way I can contact that user and see what's up. I also filter all outgoing port 80 connections with Squid and Dansguardian, to assist with any potential phishing attempts. On my LAN, I know who, where and what all the traffic is, and if a user needs a port opened, so be it, I'll talk to them and see what it's for and then make the decision as to whether or not said port should be opened.

In short, what I recommend is that you disable all client firewalls on your desktops and set up two profiles for your portable systems; one that disables your laptop's firewall whenever you're connected to the LAN and one for when you're not.

i don't know what your knowledge of what a firewall is or how it works but basically it blocks connection ports and slows or prevents unwanted programs from connecting or getting into your computer's system ... in order to host and or play games using any machine be it windows or linux or even mac you will need to forward the corresponding ports needed for the game on your router and also allow an exception for the program in the firewall itself to establish a good connection .... however as one who simply cannot be bothered i tend to disable the firewall and forward the ports on the router ... not exactly a technical answer but it's how to fix that issue