The best replacement for firewall is router.

The best alternatives to firewall are rated as following:
★★★★★  router
★★★★★  antivirus
★★★  proxy
★★  zone alarm
★★  acl
★★  software firewall
★★  ids
★★  ips
★  norton firewall
★  windows firewall
★  nat
★  proxy settings
★  proxy server
★  firewall
★  vpn
★  utm
★  hardware firewall
★  router first
★  gateway
★  access list
★  zonealarm
  norton
  intrusion detection system
  mcafee firewall
  vlan
  appliance firewall
  sbc
  comodo
  iptables
  virus protection
  stateless firewall
  fire barrier
  antivirus software
  network firewall
  dmz
  verizon firewall
  mcafee
  fire separation
  software

Your alternative for firewall is not listed? Suggest!
Speaking about firewall, one probably shouldn't forget about vpn.

Other search terms related to firewall and their ratings are:
★★★★★ vpn
★★★ router
★★ nat
★★ ips
★★ antivirus
★★ proxy
★ ids
★ dmz
★ avast
★ ip
limewire
wireless router
proxy server
avg
You have in mind a companion for firewall and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of firewall in all years. Click on graph for more.
firewall
router
antivirus