Comments on: Applying an ACL in Packet Tracer for class http://itknowledgeexchange.techtarget.com/itanswers/applying-an-acl-in-packet-tracer-for-class/ Tue, 18 Jun 2013 21:45:09 +0000 hourly 1 By: blankreg http://itknowledgeexchange.techtarget.com/itanswers/applying-an-acl-in-packet-tracer-for-class/#comment-64837 blankreg Thu, 25 Jun 2009 22:48:37 +0000 #comment-64837 Funny, I am also doing the Cisco Academy at the moment. Although I passed it over 10 years ago, I have to do the Academy as I will be a tutor for it next year.

My only advice is to always remember that they are written from the perspective of the router, so applied ‘in’ they are for traffic coming into the router from the LAN, so the first address (from) should be a LAN address, and the second address (to) is where that packet is going (permit), or is not allowed to go (deny). Applied ‘out’ it is the reverse, the first address is where it came from, and the second is the LAN it is going out onto. The masks are reversed on all routers, but are the normal ones on firewalls, just to confuse everyone. And the golden rule to remember is that they are actioned in the order you write them, and it exits when it matches a condition.

Practice is the key, do a lot of these and it becomes second nature. Use the Packet Tracer software to practice. set up a simple netowrk with one router and a PC on one interface and a PC on another, and apply different access lists to stop some traffic, and allow others. You should soon get the hang of writing these.

Good Luck with the course, and the exam when you do that.

]]> By: mrls718 http://itknowledgeexchange.techtarget.com/itanswers/applying-an-acl-in-packet-tracer-for-class/#comment-64695 mrls718 Tue, 23 Jun 2009 23:57:27 +0000 #comment-64695 Hey thanks alot that helped my a MILLION lol. I’m attending the Cisco Network University and up to this point every thing has been a walk in the park for me. I dont know what it is with the ACL’s that I’m just not grasping. I have a clear understanding but sometimes I get a brain freeze when it times to comfigure. I dont get like this when it comes to anything else though.

Again thanks alot, and if you have an easy way to understanding ACL’s please let me know. lol

Thanks,
MRLS718

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