Unlang operations with IP addresses

[Ľudovít Mikula]

Ok, I've got the question wrong.

What I want to do:  based on assigned IP address and subnet mask, 
compute first IP address from the range from which the IP address was 
assigned.

Example:

given:
   DHCP-Your-IP-Address: 192.168.10.20
   DHCP-Subnet-Mask: 255.255.255.0

would produce:
   DHCP-Router-Address: 192.168.10.1

Ludo

On 10. 12. 2024 18:21, Alan DeKok wrote:
> On Dec 10, 2024, at 12:13 PM, Ľudovít Mikula <ludovit.mikula at mikori.sk> wrote:
>>   I am trying to figure out how to compute IP address from a range and netmask in freeradius v3.
> 
>    I'm not sure what that means.  There's no "range" in the server, just IP addresses such as 192.168.0.1, and IPs with prefixes, such as 192.168/16
> 
>> Actually something similar like this expression in v4: %{eval:%{DHCP-Your-IP-Address} & %{DHCP-Subnet-Mask} + 1}
> 
>    That's not the v4 syntax, as v4 is much, much, simpler than that.  But whatever...
> 
>    Do you want to convert an IP + mask into an IP address prefix?
> 
>   In v3, you should be able to this by simply treating the IP/prefix as a string:
> 
> 	something prefix = "%{DHCP-Your-IP-Address}/%{DHCP-Subnet-Mask}"
> 
>    The parser won't care that there are "too many" things in the IP address.  It will take care of clearing the lower bits automatically.
> 
>    Alan DeKok.
> 
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