[CentOS] firewall?

Ljubomir Ljubojevic office at plnet.rs
Sat Jul 16 17:45:53 UTC 2011

Keith Roberts wrote:
> I read some time ago something about tunneling different 
> protocols through firewalls? which sounded quite scary.

Depends on the tunneling protocol you use, and on what platform you are 

For example, I use vtund package (server-client shema) with simple 
config to connect to my network with a "long LAN cable" going through 
internet and giving me access to my fully routed network with dozens of 

And only server has to have public IP with open vtund port.

Once created it will reconnect if link was broken.

There is also OpenVPN from more used protocol.

Anly thing you need to watch for is routing, telling systems on both 
sides what subnets they can see on the other side of the link, but it is 
also part of the protocol config, or you can even use dynamic routing.

If you use standalone tunneling devices, setting boils down to 
configuring via web config by adding parameters.


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