Building together open source network OS for people


NAT with a thousand faces

The familiar use cases for NAT are source NAT/masquerade for allowing private subnets access to the Internet, and port forwarding from the Internet to a host in a private ...
Read More

Interaction between IPsec and NAT (on the same router)

I've just completed a certain unusual setup that involved NATing packets before they are sent to an IPsec tunnel, so I thought I'll write about this topic. Even in perfectly ...
Read More

Setting up GRE/IPsec behind NAT

In the previous posts of this series we've discussed setting up "plain" IPsec tunnels from behind NAT. The transparency of the plain IPsec, however, is more often a curse than a ...
Read More