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iptables allow creation of rules to define packet filtering behavior.

5
votes
1answer
I was going through this article on iptables and there the author said that: It's important to turn off ECN (explicit congestion notification) so that Internet communications will work properly. Why do we need to disable the ECN? …
asked Sep 13 '11 by Chankey Pathak
38
votes
2answers
I am confused what's the actual difference between SNAT and Masquerade? If I want to share my internet connection on local network then whether should I select SNAT or Masquerade?
asked Oct 3 '11 by Chankey Pathak
9
votes
2answers
I want to stop internet on my system using iptables so what should I do? iptables -A INPUT -p tcp --sport 80 -j DROP or iptables -A INPUT -p tcp --dport 80 -j DROP ? …
asked Sep 11 '11 by Chankey Pathak
3
votes
1answer
I made default policy of my machine- iptables -A INPUT -j REJECT #DROP ALL PACKETS TO INPUT CHANNEL INPUT channel has been blocked. Now I want to allow only some specific services like I should be … able to access the internet. So what rule should I add? Port 80 is for HTTP so I tried allowing that port by iptables -A INPUT -p tcp --dport 80 ACCEPT But it didn't work. Let me know how can I do this? …
asked Sep 11 '11 by Chankey Pathak