local ports range redirection to corresponding addresses range using iptables

Question

So i have this linux router, that has 2000 differents ips. And i want to redirect local source ports between 10001 and 12000 linearly from source addresses in the subnet 192.168.0.0/21

So that would means,

localhost:10001 has the source address 192.168.0.1 localhost:10002 ==> 192.168.0.2 ... localhost:10256 ==> 192.168.1.1 ... etc

I know how to do that with 2000 lines of iptables, like this :

iptables -A POSTROUTING -t nat -p tcp --sport 10001 -j SNAT --to-source 192.168.0.1 ... ...

But what i'm after is avoiding doing 2000 lines of iptables and use port range/address range of iptables or somekind of trick that could be possible.

Anyone ?

Many thanks

Answer 1

Mmmm... I don't think so. You will need 2000 rules. Although you don't have to do them all manually.