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.
Dear all:
Recently i have deployed squirrel mail 1.4 on a RHEL5 box at client internal network. Every thing is running fine but one of my ip tools has detected e numerous broad cast to different IP addresses like 192.x.x.x or 151.x.x.x or 153.x.x.x.
I am not much worried since the company is using this email service inside their internal perimeter, but i want to know what exactly is going on. Does I need to configure iptables to block such broad cast?
Dear all:
Recently i have deployed squirrel mail 1.4 on a RHEL5 box at client internal network. Every thing is running fine but one of my ip tools has detected e numerous broad cast to different IP addresses like 192.x.x.x or 151.x.x.x or 153.x.x.x.
I am not much worried since the company is using this email service inside their internal perimeter, but i want to know what exactly is going on. Does I need to configure iptables to block such broad cast?
Thanks
Hard to say...you don't say what "ip tool" is returning this information, in what circumstance, or give any details about your network. Since we don't know what IP ranges you use internally, what the exact output of the "ip tools" is, it's hard to say if it's normal or not.
Dear all:
I have carefully reviewed the network. The tools I m using are "wire shark" and "com view". The broad cast that I have recorded is from my mail server to external IP addresses, I already mentioned. Now i can't understand why is this happening.
Posting some of the packets to the forum may help us understand what the issue may be. If you post some, sanitize any crucial data you may not want to be showing to the public.
Posting some of the packets to the forum may help us understand what the issue may be. If you post some, sanitize any crucial data you may not want to be showing to the public.
I have checked all the data in wireshark. It is an ARP broad cast from mail server IP address and MAC to the x.x.x.x IP address and all 00:00 MAC. Is it OK.
Last edited by sabir_mustafa; 08-11-2009 at 07:54 AM.
Well: I got control of it. I used IPTABLES to block broad cast from mail server to any other network except specified trusted networks, further binding a custom https port through which clients can access the server.
LinuxQuestions.org is looking for people interested in writing
Editorials, Articles, Reviews, and more. If you'd like to contribute
content, let us know.