[ILUG-BOM] Iptables Query

Rony gnulinuxist at gmail.com
Thu Aug 6 15:18:32 IST 2009

steve wrote:
> So as far as the filter table is concerned, in this context, there isn't any 
> difference between your 'home' network and the 'world' network. The rule will 
> just be matched against the networks mentioned in the rules. Think about it a 
> bit. Your rules might even mention a src/dest addresses on networks that none of 
> your interfaces are even part of.
> Mentioning an action in the INPUT chain simply means that the packet would be 
> examined when received and filtered accordingly.
So there is no input point and output point. The setup that I will have 
is a box with 2 ethernet ports, one connected to the MTNL router and the 
other to the LAN. How will the firewall recognize the inbound/outbound 
traffic directions as it is inbound for one interface and outbound for 
the other and vice versa. In a GUI firewall I remember it asking which 
is the local device and which is on the internet. Will I have to make 
all rules based on each ethernet device as well as ip addresses to let 
iptables know direction?



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