Again and again there is one central issue for the Admin: Which IP addresses are assigned to which host and which addresses can still be assigned? The IP lists in i-doit can be a great help to tackle this question.
A more detailed approach into this matter is provided in the application case for the IP Address Management (IPAM).
IP List Category#
The IP list category provides a comprehensive overview of each net. In the default installation of i-doit it is assigned to the object type Layer-3-Net. You can find all objects which are assigned to this net, including their IP address, host name and type of address assignment, in a tabular listing.
The type of address assignment is presented with colors and their respective meaning is explained in a color key on the right of the list:
- Green: Net address / Broadcast
- Yellow: Default Gateway (This is the object for which you defined in the Host address category that it should act as default gateway.)
- Orange: unnumbered address range
- Gray: statically assigned IP addresses
- Blue: IP addresses which are reserved by the DHCP server (see also DHCP category)
- Light blue: IP addresses which are assigned dynamically by the DHCP server (see also DHCP category)
In order to avoid (unintentional) address conflicts, i-doit points out multiple assigned IP addresses beside the table.
In smaller networks (< 1,000 IP addresses) also IP addresses which have not been assigned yet are displayed. Should the network have an address range which is too extensive, for example a /16 with more than 65,000 IP addresses, only the used IP addresses are shown and those who are not yet assigned are hidden. Additionally, a corresponding note is made.
Another table on the right concludes important information about the net:
- IP addresses in use
- Net address
- Subnet mask
- Default gateway
- Address range
- Superordinate supernets (object type Supernet)
- Assigned VLANs (object type Layer-2-Net)
You can expand the list by further objects without using the Host address category but by using the Connect object button.
Check of IP Addresses#
The IP list category provides the possibility to make a comparison between the target state and the actual state. In order to check if the documented IP addresses and host names are really assigned, i-doit can send ICMP packets ("Pings") and start a NSLOOKUP. For this purpose, i-doit requires net access. You can check single entries or all entries in a subsequent order. With Administration → System settings → Tentantsettings → Options for the IP-List you can set which command line tools should be applied. The user/ group of the Apache webserver have to have the permission to activate these tools.
- Ping: Send ICMP packet to IP address
- NSLOOKUP: Specify IP address as host name
- Reverse NSLOOKUP: Specify host name for IP address