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Linux Security

Hello I went to a job interview in which the knowledge on linux security had to be vast. However, I was not disclosed detailed information on the solution in place, however I was told that Linux was used as the front line of defense and had a firewall installed on it which is open source according to the manager. I was wondering if you experts were familiar on those types of open source programs/solutions for linux.

I was also wondering where does that leave CISCO firewalls compared to the linux-only solution. In addition, the interviewer also told me that he taught CISCO in a technical shool for many years and that has left me wondering since he told me that there are Linux Security certifications that cost more than $3,000 US and that very very few people had those certs since they were so hard and costly.

Can somebody please enlighten me on this secret world of Linux Security. Thanks.

1 Solution
All details on Linux Security can be found out on the internet. Linux uses a firewall in-built called iptables. You also have other firewalls like firestarter. These are open-source solutions for Linux. Configuration of rules and tuning instructions are available with them. You can also refer to HOWTOs published by the Linux communities on the internet. Many setups use old computers and dedicate them as firewall products. You also have proxy servers such as Squid and other software like spamassassin, netfilter, clamav (antivirus), snort intrusion detection system, network analyzers such as ethereal, vulnerability scanners such as nessus. To get to know more about these, you can install Linux on your computer and experiment on them. You can start with http://www.tldp.org and look for the HOWTO on Linux Security and further references.

AFAIK, the certification courses of RedHat i.e. RHCE are most popular. You can get more details on the Red Hat site on them.

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