nftables: How to add bordering ip-ranges to a named set

[Matthias Taube <no_html.max50kb@nurfuerspam.de>]

Hi,

if I define a named set in nftables
> nft 'add set inet filter black2 {type ipv4_addr; flags interval; }'
> nft add element inet filter black2 { 192.168.1.1/24 }

it is not possible to add bordering ip-ranges:
> nft add element inet filter black2 { 192.168.2.1/24 }
> <cmdline>:1:1-49: Error: Could not process rule: File exists
> add element inet filter black2 { 192.168.2.1/24 }
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

but if I add the ranges in ONE command it works:
> nft add element inet filter black2 { 192.168.1.1/24, 192.168.2.1/24 }

then the ranges are put together to one ip-range:
> # nft list set inet filter black2
> table inet filter {
> 	set black2 {
> 		type ipv4_addr
> 		flags interval
> 		elements = { 192.168.1.0-192.168.2.255}
> 	}
> }

How it is possible to create a set to flexible add and delete bordering 
ip-ranges?

mfg
Matthias