The problem is that Iperf3 with NAT doesn't send data after the connection is established, but if I use the fastpath of Netfilter, it will work normally.
For the NAT(iptables), I've tried two things, one is the MASQUERADE option, and the second is manually setting up SNAT and DNAT, but both results are not different.
OpenWRT v22.03-rc5, iptables v1.8.7 (nf_tables)
I shut down the firewall.
fw4 flush /etc/init.d/firewall stop
Here is my environment
iptables -t nat -A POSTROUTING -d 192.168.1.111 -j MASQUERADE
iptables NAT settings
Wireshark on Srv1
There is a Kernel option need to open?
Does anyone meet a problem like this?