What are the limitations of a multi-threaded program (over 10000 UDP packets per second) running through the ICS (NAT) gateway where win7 is installed?

Question

Windows

Good day!
Home network config:
Gateway - Windows 7, routing via ICS. Gateway network card - HP NC360T. Processor i7 - 920. WINDOWS firewall disabled. Nothing else is worth it
Channel: 80 Mbit TTK.
Under NAT'om, an hp g5 dl360 server is connected to a windows 2008 server via a budget D-LINK DES 1016D switch.
We need to access 10000-20000 simultaneous threads from it to dns servers.
This case rests, apparently, in the settings of TCP / IP, ICS and the network card.
When you run the program on a server under NAT'om on the main computer, which is used as a gateway, the image and sound freeze in 2-3 minutes for 1-2 seconds without full network load (10%) and processor.
We tried to run the program on the gateway itself - the friezes became less noticeable, but still there.
That is, the problem is not only in the ICS routing program (possibly, the switch), but also in the TCP / IP parameters. It looks like something is stuck somewhere.
I understand that they will throw rotten eggs at me, saying that I need to install a gateway on Linux and not take a steam bath. But the network is home, and we are not system administrators. :) At best - beginners. (In passing, I'll ask which assembly is better to use for a gateway where such an increased load is required, is it better with auto-tuning?)
At the moment it works, but noticeably not at full capacity through the gateway itself.
First you need to achieve stable operation on the gateway itself.
I am attaching my settings:

TCP/IP PARAM

Of course, I would like to configure everything as it is without additional purchases of additional pieces of iron.
Thanks to.

Answer 1

Gateway - Windows 7

This OS is not typically used as a high performance gateway.

10000-20000 simultaneous threads to dns servers

Do you have a recursor and a cache?

I understand that they will throw rotten eggs at me, saying that I need to install a gateway on Linux and not take a steam bath.

I won't.

This case rests, apparently, in the settings of TCP / IP, ICS and the network card.

Most likely even in the performance of the network card driver. You can try to install a more recent version (for W 10).

A server is connected under NAT'om ...
We need to access 10000-20000 simultaneous threads from it to dns servers.

Address translation (natization) usually has nothing to do with DNS request traffic. The flow of requests and responses goes bypassing NAT.