Antonio, Check it out: between 10 and 14 we have 1 bit different right? Which bit? It is the 4 bit right? Since it can be 1 or 0 we "don't care" so it is a 1 in the mask.
So our mask is 00000100. That is 4 in decimal. Regards, Joe Astorino CCIE #24347 (R&S) Sr. Support Engineer – IPexpert, Inc. URL: http://www.IPexpert.com -----Original Message----- From: "Antonio Dee Hotmail" <antonio_...@hotmail.com> Date: Mon, 18 May 2009 23:49:09 To: 'CCIE_RS OnlineStudyList'<ccie_rs@onlinestudylist.com> Subject: Re: [OSL | CCIE_RS] ACL filtering blues Hi Prakash, Michael is right, this would filiter only 10 and 14 , and not 13 pretty much let say i want 10 and 14, and the answer is 0.0.4.0 ???? still having hard time grasping it Cheers! ANtonio From: prakash patel [mailto:patelpr...@hotmail.com] Sent: Monday, 18 May 2009 11:35 PM To: antonio_...@hotmail.com; ccie_rs@onlinestudylist.com Subject: RE: [OSL | CCIE_RS] ACL filtering blues Addition to previous. it will allow whole range though. What is the statement says...need more information. We may have to adjust it. _____ From: patelpr...@hotmail.com To: antonio_...@hotmail.com; ccie_rs@onlinestudylist.com Date: Mon, 18 May 2009 09:59:33 -0400 Subject: Re: [OSL | CCIE_RS] ACL filtering blues Hello 10=00001010 13=00001101 14=00001110 What is the common here ?....00001xxx so xxx vlaues give you 0.0.7.0 the fist should be 10.10.8.0 so the whole completed is 10.10.8.0 0.0.7.0 if u see logical in 3rd octets ...8 is starting value and ending 8+7 = 15 10.10.8.0 thru 10.10.15.0 makes sense? _____ From: antonio_...@hotmail.com To: ccie_rs@onlinestudylist.com Date: Mon, 18 May 2009 23:23:05 +0930 Subject: [OSL | CCIE_RS] ACL filtering blues Hi All, Need some help on ACL calculation. This is general ACL filtering scenario. I'm just practicing on ACL filtering especially on the non-continuous wildcards. i've injected this to my test router but i don't seem to get the logic why it's this wildcard. can somebody enlighten me on this? I know 0 in the wildcard are care bits and 1 don't care, just the opposite of a subnet mask. Example Scenario: I get this networks from a backbone router: network 10.10.10.0 network 10.10.11.0 network 10.10.12.0 network 10.10.13.0 network 10.10.14.0 network 10.10.15.0 network 10.10.16.0 I want to filter on the third octet and allow only 10, 13, 14 to come in been playing with various values on the wildcard, and the working value is 0.0.4.0 , WHY???? Kind Regards, Antonio _____ Windows LiveT: Keep your life in sync. Check <http://windowslive.com/explore?ocid=TXT_TAGLM_BR_life_in_synch_052009> it out. _____ Windows LiveT: Keep your life in sync. Check it out. <http://windowslive.com/explore?ocid=TXT_TAGLM_BR_life_in_synch_052009>
