[CentOS] firewall?

Ljubomir Ljubojevic office at plnet.rs
Sat Jul 16 13:10:43 UTC 2011


Rudi Ahlers wrote:
> The fact is, you can use a Linux firwall with a single NIC, as long as
> you use different IP subnets and strong iptables rules to filter
> traffic properly between the 2 subnets.
> 
> another scenarion where this is used more and more these days is with
> virtualization, where you won't have different NIC's for each virtual
> server on the same physical server. The only way to firewall that
> traffic is to use iptables and VLAN's.
> And many many hosting companies use virtual hosting for their clients.
> 

This type of setup has many caveats any it is best for the sake of 
newbies/noobs to say it is doable but dangerous. I know you will agree 
with me on this.

Those well versed in networking (should) already know all about securing 
this schema, and can do as they like.

Ljubomir



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