Linux - SecurityThis forum is for all security related questions.
Questions, tips, system compromises, firewalls, etc. are all included here.
Notices
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
Get a virtual cloud desktop with the Linux distro that you want in less than five minutes with Shells! With over 10 pre-installed distros to choose from, the worry-free installation life is here! Whether you are a digital nomad or just looking for flexibility, Shells can put your Linux machine on the device that you want to use.
Exclusive for LQ members, get up to 45% off per month. Click here for more info.
Is there a way with iptables to retrieve someone mac address when they are snooping around or trying ot get into your machine? I know Black Ice does it but is there a way of doing this in Linux?
Let me set the story right. IP has nothing to do with MAC address. All IP knows is dumb old 32-bit IP address. MAC address (at least for traditional LAN's) are handled by Ethernet.
Let me describe this better. I'm going to give you a little OSI theory.
Layer 2 is the Data Link Layer, its the lowest connection to the wire (i.e. Cat-5 or telephone line, etc.) Its also the last layer of encapsulation before data is transmitted in its binary electrical form. It's also the Layer where Ethernet exists. Ethernet is where the notorious MAC address lives. An Ethernet frame contains both Sending and Receiving MAC addresses of devices on LAN. Notice I said LAN. Ethernet exists independents of IP and later TCP. All Ethernet does is tack on what it knows about where its going and wheres it's being sent from. (MAC addresses of sending and receiving hosts)
Now when network communication leaves your network or a few hops after that. Ethernet Frames get stripped off and sent further using more high level encapsulation such as HDLC on Serial Links. So when the Ethernet is stripped the MAC's get lost! So as I see it The MAC address you get on your LAN from the Internet are that of either your ISP or maybe even your own router.
LinuxQuestions.org is looking for people interested in writing
Editorials, Articles, Reviews, and more. If you'd like to contribute
content, let us know.