I'm studying CCNA and i've just learnt about Reflexive ACL's. Just wondering how secure or insecure it would be to use an ACL in place of a firewall.

This was a LAB router that I would like to set up as my home internet gateway.

1 Answer 1


Yes, you can use a reflexive ACL but it couldn't possibly be as secure as a stateful inspection firewall. Since you are studying for the CCNA, you should build the lab network like real customers do. IOS has a real stateful inspection fw; I would use that.

  • Thank you, I didn't realise that was in all IOS images. Jun 26, 2013 at 12:13
  • which version and feature set are you using? Jun 26, 2013 at 12:21
  • 3
    @Mokilok it isnt in every IOS images - you need to use the feature navigator to check as Mike is referencing to.
    – knotseh
    Jun 26, 2013 at 13:52
  • My image is c1841-ipbase-mz.124-3i.bin I'm guessing that since it's ipbase I don't have access to the firewall. Jun 28, 2013 at 10:05
  • Correct, in most cases you will require AdvIPservices IOS to utilise the IP Inspect features. It is very powerful, don't forget by default it hates Java - cisco.com/en/US/docs/ios-xml/ios/sec_data_cbac_fw/configuration/…
    – BrianK
    Jul 1, 2013 at 0:46

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