Typically software that runs to prevent network traffic from reaching a computer. Also a hardware device that works on a network level rather than running on a single computer.

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1answer
2k views

Any tips for blocking an address range for outgoing packets?

Anyone used ipfw or pfctl to block an IP address range for outgoing packets? I would like to temporarily block Apple's IP address range 17.*.*.* to find everything that's phoning home phoning home. ...
8
votes
3answers
25k views

How to restrict “Remote Login” (ssh) access to only certain IP ranges?

Can someone please tell me how to restrict SSH access only to certain IP ranges (e.g. local network) and not the whole Internet? I guess this has to be done via firewall.
14
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3answers
29k views

How can I open a port (not application) in the OS X 10.6 firewall?

Let me preface this by saying: I do not want to drop my firewall completely Yes, I really do need particular ports rather than an application. So I see that there is the option to allow particular ...
3
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4answers
3k views

How do I use ipfw to allow LAN access but deny Internet access?

How can I use ipfw (or another tool, if one is available) to allow unlimited access between computers on my LAN, but not allow access to the Internet? (The IPs on my local LAN are 192.168.0.xxx)
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votes
2answers
3k views

Why does Microsoft Word need to allow incoming network connections?

When I turn on the Mac firewall I get prompted to allow the MS office apps (Word, Excel, Powerpoint) to accept incoming connections. Why is this, and is it safe to allow it ? I'm running Mac OS ...
1
vote
1answer
877 views

sshdfilter and ipfw - why are my rules flushed so often?

I have sshdfilter setup to maintain ipfw rules when someone is un invitedly trying to login my system. This has been working quite a while. Since a while - beginning to suspect the last lion upgrade ...
2
votes
3answers
6k views

How should I set up the firewall and DHCP with an AirPort Extreme and Lion Server?

I'm trying to set up a network using an AirPort Extreme as a router (connected to the WAN on one end and the LAN on the other). I understand that out of the box I will have a hardware firewall, and ...
3
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2answers
2k views

Fixing “a sealed resource is missing or invalid” warning

I've changed the application icon of my Eclipse editor, and this causes a confirm dialog to pop up asking me if I allow the program to accept incoming network connections. I faced this before, but ...
4
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3answers
4k views

Questions about how Internet Sharing works

A simple checkbox and a menu allow you to share your internet connection (no matter which interface you get it on) with any other interface (theoretically). But, the guts of this is a little ...
2
votes
1answer
1k views

Is ipfw the same as pf in FreeBSD?

I'm wondering if references referring to pf in FreeBSD are applicable to ipfw in Mac OS X Snow Leopard? I'd like to know to see if it's worthwhile to consult books on pf for use with Mac OS.
3
votes
1answer
1k views

How can I enable DVD or CD Sharing with the Firewall on?

I'm trying to enable "DVD or CD Sharing" in the System Preferences. When I enable it, it says that the Firewall is blocking it. If I go into the Security > Firewall settings, I see that the first item ...
6
votes
5answers
1k views

Is there a way to use different network connections for different apps

At work we have a firewall that prevents certain outbound connections. But I also have a Clear wireless personal hotspot. I would like to use the work connection for normal requests but for certain ...
6
votes
1answer
470 views

Always Asked to Configure Firewall for iTunes

Whenever I open iTunes, I get the standard OS X dialog, Do you want the application "iTunes.app" to accept incoming network connections? Every time I click allow, but I am asked the same thing without ...
2
votes
2answers
3k views

Settings for Firewall and AirPort Extreme Router to Open a Port

I am trying to make ports on my OSX 10.6.5 mbp accessible to the open internet. The only thing I could find in the system firewall was allowing (or disallowing) a particular.app file, but nothing ...
20
votes
4answers
11k views

How to get rid of firewall “accept incoming connections” dialog?

I've accepted this so many times that firewall should already remember it. For example, I get it for Eclipse when starting my java programs in debugging mode ... sometimes this dialog is displayed ...
3
votes
1answer
763 views

How can I restrict Mac sharing services to a specific network/adapter?

I want is to set up a Mac to connect to multiple networks. So far, so good. However, I only want to grant AFP access to users on ONE of the networks, but not the other. How can I accomplish this on ...