Firewall query

networking

I'm modifying an iptables script but there are a few bits I'm not certain about.

These two variables are defined

LO_IFACE="lo" 
LO_IP="127.0.0.1"

So the loopback address is 127.0.0.1… but I don't understand the LO_IFACE="lo" bit

Here is an example of where these are referred to in a rule

iptables -A INPUT -p ALL -i $LO_IFACE -s $LO_IP -j ACCEPT

So instead of defining these variables you could put 127.0.0.1 for LOIP, but what would you put for LOIFACE?

Does this even make any sense??

lo (lowercase LO) is the "network interface" used for loopback.

In easy terms, think of it as of a virtual network card, that's connected to the loopback only.

Just like eth0, eth1, eth2 are Ethernet cards, ppp0…pppX are PPP interfaces, and so on.

And, you'd put "lo" instead of $LO_IFACE, obviously.

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