What is an illegal IP address?
The message “Invalid IP Address” indicates a problem with your computer’s network setup. Without a valid IP address your computer cannot use the network. A variety of reasons can make an IP address invalid, such as address conflicts with other computers and network configuration problems.
What are two reasons to have multiple IP addresses or interfaces on one server?
To compensate for a host that’s down at that moment by adding its IP address to another one. If you have multiple IP networks on the same physical/logical network/vlan it will prevent traffic from being exchanged via the gateway, speeding things up and reducing the load.
Can a server access the public IP address?
A consequence of this is that from a server inside the network it’s no longer possible to access the public IP address. So any HTTP requests for locally hosted websites will fail because a DNS lookup will return the public address which is unreachable.
Why does every web site have the same IP address?
Thus, every web site on this server has the same ip address. The DNS names are all resolved to the same ip address. When a web browser accesses one of these sites, he send a request containing the desired site name in the host value, so the web server can identify where to look for the content.
How are IP addresses assigned in a private network?
From inside the private network each server or device is known only by it’s private IP address and is always referenced using that address. Internal IP addresses are either assigned manually, or dynamically by the router using DHCP (Dynamic Host Configuration Protocol).
Is there a way to access an external IP address?
Sure enough there’s a simpler solution using iptables. We know that a request from the server itself (telnet, web browser or web spider for example) can’t reach the external IP address, but that the same request using the internal address will get through. Using the right routing rules we can translate those requests and it should all just work.