what is the difference between src-nat and dst-nat chains in firewall\nat.
source NAT translates the source address (e.g. a private lan wants internet access, the private - source address has to be translated to an public address)
destination nat translates the destination address (e.g. you have a server with a private ip behind a wan connection, you have to forward(translate) a request to your public ip to the real private address
thank you