We're Sorry, Full Content Access is for Members Only...

If you like to keep on reading, Become a Member Now! Here is why:

  • Learn any CCNA, CCNP and CCIE R&S Topic. Explained As Simple As Possible.
  • Try for Just $1. The Best Dollar You've Ever Spent on Your Cisco Career!
  • Full Access to our 644 Lessons. More Lessons Added Every Week!
  • Content created by Rene Molenaar (CCIE #41726)

497 Sign Ups in the last 30 days

satisfaction-guaranteed
100% Satisfaction Guaranteed!
You may cancel your monthly membership at any time.
No Questions Asked!

Tags: , ,


Forum Replies

  1. hi, great website ! i’m still learning basic guides cisco autodidact. i hope i can catch this section soon.

  2. Rene,

    I have been working on access-lists and NAT on my little lab. I have a Cisco router connected to a D Link router that is in turn connected to a vonage router which in turn connects to a Cable mode - my gateway to the internet. I am able to ping the D Link IP address from the cisco router and also the internet. The D link using 192.168.0.0/24 subnet. I configured other subnets behind the cisco router. I managed to use NAT to be able to ping the D Link router but could never be able to ping anythin on the internet. All my other subnets behind the cisco

    ... Continue reading in our forum

  3. Good question, there are quite some differences.

    The reflexive access-list can match on L2-L4 attributes, just like the normal extended access-list. It’s quite “dumb” since the only thing it does is track the outgoing traffic and creating an access-list entry automatically that reverses the source / destination IP and port numbers. This works for traffic like HTTP but not for applications with dynamic port numbers.

    CBAC is a lot smarter, it can match up to L7 attributes and supports a wide range of protocols. The reflexive access-list and CBAC are both configur

    ... Continue reading in our forum

  4. Hi Nabeel,

    The short answer…not very well. Reflexive ACLs just create a temporary permit statement that is the opposite of the outgoing traffic. If you want to use this you’ll need to use passive FTP.

    If you only can use active FTP, take a look at CBAC.

    René

  5. Do relexive access lists imply that by default, Cisco’s ACL’s are not stateful?

9 more replies! Ask a question or join the discussion by visiting our Community Forum