[ubuntu-hardened] Hardening Network Security Questions

[bobby]

I was on the ubuntu forums, and a user had posted this:

Always have both a hardware AND software firewall.
Don't trust other computers on the same LAN implicitly. One of them may
have been hacked and is being used to attack all other systems

I had some clarification questions on these:
1. I am running iptables on my server. Is this not enough? Is a hardware
device recommended as well?
2. How is this acted upon? How do I protect myself internally, from these
types of attacks?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ubuntu.com/archives/ubuntu-hardened/attachments/20180518/27b0db68/attachment.html>