firewall

In last months reader poll I asked about Firewall on dedicated UNIX / Linux box. Do we really need a firewall? Personally, I install firewall on all boxes to filter out unwanted junk and IPs; even if box is only running public service such as a web server. The overall idea is to limit access […]

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I am getting error that read as No Route to Host. I am trying to ping my ISP gateway as well as DNS server but I am getting this error. How do I solve this problem? This problem indicate networking conflicts or some sort of networking configuration problem. Here are things to check: Can you […]

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Recently I came across very powerful and nifty tool called cutter. Just imagine that people in your private network using peer to peer (P2P) software such as Kazaa, iMesh or others and you want to cut them or just want to cut all ftp connection over your firewall but not all traffic to host. Network […]

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Here is small script that does this. Debian or Ubuntu GNU/Linux does not comes with any SYS V init script (located in /etc/init.d directory) . You create a script as follows and use it to stop or flush the iptables rules. Please don’t type rules at command prompt. Use the script to speed up work. […]

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Recently I got chance to play with Virtuozzo VPS. Good news is they are good to reduced cost and bad news (as of Dec-04, 2004) they do not support full iptables rule set like –state and –log etc. After spending more than 4+ hrs I was able to setup simple but effective firewall on Red […]

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