Keywords: KDE, Guarddog, firewall, linux, ipchains, iptables

| # Questions and Answers

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## Chapter 4. Questions and Answers

This document may have been updated since your installation. You can find the latest version at http://docs.kde.org/current/This application isn't part of a KDE package/.

4.1. Does Guarddog need to be running for it to protect my computer?
4.2. How can I see which ports a given protocol uses? or How can I see which ports a given protocol opens up?
4.3. Why are my FTP/Mail/IRC connections slow?

4.1. | Does Guarddog need to be running for it to protect my computer?
| Guarddog provides a user friendly way of configuring your computer's built-in firewalling capabilities. Guarddog itself doesn't need to be running continously to protect your computer.
4.2. | How can I see which ports a given protocol uses? or How can I see which ports a given protocol opens up?
| Go to the Advanced tab and tick the checkbox at Show advanced protocol help. Now when you go back to the Protocol tab and click on the name of a protocol in the middle of the window, the protocol on the left side of the tab will show the information about the protocol and also what TCP/UDP ports it uses.
4.3. | Why are my FTP/Mail/IRC connections slow?
| Many mail and IRC servers, when connected to, use the "ident" protocol to try to find out the owner of the incoming connection, and don't respond to the incoming connection until they have tried "ident". This problem shows up, for example, as delays when connecting to mail servers. The connection will be made with the mail server, but there will be a noticeable delay before any mail is retrieved. This is because the server tries to make an "ident" connection back, but has wait and time out before realising that it won't work. The solution is to just make sure that "ident" is being rejected for connections coming from the zone containing the mail server.