The best replacement for stateful is stateless firewall.

The best alternatives to stateful are rated as following:
★★★★★  stateless firewall
★★★★  stateless
★★★★  stateless ipv6
★★★  stateless server
★★  stateless beans
★★  stateless services
★  stateless session beans
★  deep packet inspection
★  stateless java
★  stateless http
★  stateless web services
★  stateless servers
  stateless service
  stateless firewalls
  stateless dhcp

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