- At the initial installation, use a publically-resolvable FQDN for the hostname. Changing this later causes LOTS of problems. Not having a good FQDN makes configuration of VPNs, Mail Security, etc. more complicated.
- By default, a firewall blocks everything. You can see in the Firewall log what is being blocked. The initial installation wizard adds Firewall rules for "Internal (Network)" that allow it Web Surfing and other access to the Internet. Astaro is a "stateful" firewall, it keeps track of connections it makes, so no rules are required to allow response traffic from the Internet.
- The public internet doesn't know how to route private IP addresses. When, for example, browsing requests are sent out, they must leave with the public IP of the External interface. The initial installation wizard adds a Masquerading (NAT) rule: 'Internal (Network) -> External'.
- When traffic arrives at an Astaro interface, it will be handled by a DNAT, if one exists, before a proxy. If it does go to a proxy, then your manual routes and firewall rules won't be considered. That is: "DNATs before Proxies before manual rules & routes."
- At the initial installation, use a publically-resolvable FQDN for the hostname. Changing this later causes LOTS of problems. Not having a good FQDN makes configuration of VPNs, Mail Security, etc. more complicated.
- By default, a firewall blocks everything. You can see in the Firewall log what is being blocked. The initial installation wizard adds Firewall rules for "Internal (Network)" that allow it Web Surfing and other access to the Internet. Astaro is a "stateful" firewall, it keeps track of connections it makes, so no rules are required to allow response traffic from the Internet.
- The public internet doesn't know how to route private IP addresses. When, for example, browsing requests are sent out, they must leave with the public IP of the External interface. The initial installation wizard adds a Masquerading (NAT) rule: 'Internal (Network) -> External'.
- When traffic arrives at an Astaro interface, it will be handled by a DNAT, if one exists, before a proxy. If it does go to a proxy, then your manual routes and firewall rules won't be considered. That is: "DNATs before Proxies before manual rules & routes."