I created iptables rule:

iptables -I INPUT -p tcp --tcp-flags SYN,RST,ACK,FIN SYN --dport 10000 -j REJECT --reject-with tcp-reset

But actually what it does is a rejecting with RST,ACK flags.

It is possible to reject only with RST flag set  ?

I know that in normal env this have no sense, but I just have a lab need of doing exactly something like that

I created iptables rule:

iptables -I INPUT -p tcp --tcp-flags SYN,RST,ACK,FIN SYN --dport 10000 -j REJECT --reject-with tcp-reset

But actually, what this does is a rejecting all packets with RST and ACK flags.

It is possible to reject only with RST flag set?

I know that in a normal environment this does not give any sense, but I have a lab and I need to do exactly as described.