Antonio, I was guessing that would be the case. I am going to put the ACL wildcard PDF up into the R&S Customer Members Configs section. It should be up there later today. But also take an opportunity to view the free vlecture we have posted on ipexpert.com that walks you thru even more and you will find it very usefull.
Regards, Tyson Scott - CCIE #13513 R&S and Security Technical Instructor - IPexpert, Inc. Telephone: +1.810.326.1444 Cell: +1.248.504.7309 Fax: +1.810.454.0130 Mailto: [email protected] Join our free online support and peer group communities: http://www.IPexpert.com/communities IPexpert - The Global Leader in Self-Study, Classroom-Based, Video On Demand and Audio Certification Training Tools for the Cisco CCIE R&S Lab, CCIE Security Lab, CCIE Service Provider Lab , CCIE Voice Lab and CCIE Storage Lab Certifications. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Antonio Dee Hotmail Sent: Tuesday, June 09, 2009 7:28 AM To: 'CCIE_RS OnlineStudyList' Subject: [OSL | CCIE_RS] FW: ACL Wildcards Hi Tyson, can't see your attachment PDF , i guess i just have to grab it from ipexpert.com site Cheers Antonio -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Kim Pedersen Sent: Tuesday, 9 June 2009 5:38 PM To: Tyson Scott Cc: [email protected] Subject: Re: [OSL | CCIE_RS] ACL Wildcards Thanks all of you for your huge help in this matter. Tyson, great job with the PDF. Sincerely, Kim Tyson Scott wrote: > > I have written a quick document that I have put into PDF for the rules > I follow for ACL Wildcards. I am not sure if I can attach on this list > or not. If the PDF is not attached to this email let me know and I > will post the PDF to the config section of R&S Customers in ipexpert.com > > Regards, > > Tyson Scott - CCIE #13513 R&S and Security > > Technical Instructor - IPexpert, Inc. > > > Telephone: +1.810.326.1444 > Cell: +1.248.504.7309 > Fax: +1.810.454.0130 > Mailto: [email protected] <mailto:[email protected]> > > Join our free online support and peer group communities: > http://www.IPexpert.com/communities > > IPexpert - The Global Leader in Self-Study, Classroom-Based, Video On > Demand and Audio Certification Training Tools for the Cisco CCIE R&S > Lab, CCIE Security Lab, CCIE Service Provider Lab , CCIE Voice Lab and > CCIE Storage Lab Certifications. > > *From:* [email protected] > [mailto:[email protected]] *On Behalf Of *Larry Hadrava > *Sent:* Monday, June 08, 2009 8:45 PM > *To:* Kim Pedersen > *Cc:* <[email protected]> > *Subject:* Re: [OSL | CCIE_RS] ACL Wildcards > > Another thing to think about "creatively" while trying to follow the > least amount of lines scenarios ( or any as far as that goes ) is to > never rule out your first line in an ACL to be a deny statement. > > I personally always write them out in binary. Do this enough times > then you will begin to think in binary and then you will be assimilated:-) > > Larry Hadrava > CCIE #12203 CCNP CCNA > Sr. Support Engineer - IPexpert, Inc. > URL: http://www.IPexpert.com > > On Mon, Jun 8, 2009 at 4:36 PM, Kim Pedersen <[email protected] > <mailto:[email protected]>> wrote: > > How would you go about this? > > Kim > > Sent from my iPhone > > On 08/06/2009, at 21.35, "Rob" <[email protected] > <mailto:[email protected]>> wrote: > > Kim, > > One thing that has helped me understand it is to do it in reverse. Instead > of getting say 64 address and trying to convert them to one or more, I > start > with an answer I want and work my way backwards. > > I always start with the Binary answer when I do some of these problems. > > Once I could work them from both directions it made it easy to understand > them. > > Rob > > -----Original Message----- > From: [email protected] > <mailto:[email protected]> > [mailto:[email protected] > <mailto:[email protected]>] On Behalf Of Kim Pedersen > Sent: Monday, June 08, 2009 2:04 PM > To: Joe Astorino > Cc: [email protected] <mailto:[email protected]> > Subject: Re: [OSL | CCIE_RS] ACL Wildcards > > Will do :) > > Im assuming its one of the things you go through in the Bootcamps as well? > > Kim > > Joe Astorino wrote: > > If you have any specific issues let us know, we'll do our best to make it > > as > > clear as possible for you! > > > Regards, > > Joe Astorino > CCIE #24347 (R&S) > Sr. Support Engineer - IPexpert, Inc. > URL: http://www.IPexpert.com <http://www.ipexpert.com/> > > -----Original Message----- > From: Kim Pedersen [mailto:[email protected] <mailto:[email protected]>] > Sent: Monday, June 08, 2009 2:52 PM > To: Joe Astorino > Cc: 'Tyson Scott'; [email protected] > <mailto:[email protected]> > Subject: Re: [OSL | CCIE_RS] ACL Wildcards > > Hi, > > Okay, hope when i hit the workbooks something gets clearer on what > > exactly > > to go through :) > > Sincerely, > Kim > > Joe Astorino wrote: > > Yeah, you are right there is no "absolute" way like most things in > this business. 2 lines is just an easy example to show the idea...I > agree it becomes much more confusing with more. Writing things out > always helps me to see the big picture clearer. When you write a line > for an ACL think through in your head "OK what EXACT range of > addresses does this permit/deny" > > > Regards, > > Joe Astorino > CCIE #24347 (R&S) > Sr. Support Engineer - IPexpert, Inc. > URL: http://www.IPexpert.com <http://www.ipexpert.com/> > > -----Original Message----- > From: Kim Pedersen [mailto:[email protected] <mailto:[email protected]>] > Sent: Monday, June 08, 2009 2:46 PM > To: Joe Astorino > Cc: 'Tyson Scott'; [email protected] > <mailto:[email protected]> > Subject: Re: [OSL | CCIE_RS] ACL Wildcards > > Hi Joe, > > Yeah, i can see that working with 2 lines, but how about more? :) > and the VOD said it was not an absolute way... > Phew.. confusing. > > Sincerely, > Kim > > Joe Astorino wrote: > > Once you do enough of them, you will find your own patterns and ways, > but if you use simple subtraction and look for the difference to be a > power of 2 that really helps! For instance in the first octet if you > have say 192 and 200 ... 200 - 192 = 8 = 2^3 ...so you know you can > match them both with 1 bit in the "8" place. > > > Regards, > > Joe Astorino > CCIE #24347 (R&S) > Sr. Support Engineer - IPexpert, Inc. > URL: http://www.IPexpert.com <http://www.ipexpert.com/> > > -----Original Message----- > From: [email protected] > <mailto:[email protected]> > [mailto:[email protected] > <mailto:[email protected]>] On Behalf Of Kim > Pedersen > Sent: Monday, June 08, 2009 2:27 PM > To: Tyson Scott > Cc: [email protected] <mailto:[email protected]> > Subject: Re: [OSL | CCIE_RS] ACL Wildcards > > Thanks for all of your help... > > When you guys do it, do you start by writing it all out in binary, > or make an educated guess on what groups together? and it is best to > start with the first octet and going forward, or the last going > > backwards? > > Again, Thanks! > > Sincerely, > Kim Pedersen > > Tyson Scott wrote: > > > Yes Correct Kim, > > 194 and 193 can defiantly be matched in one line if all the rest > were the same. In your example none of those could be combined into > one line without matching additional networks. > > Regards, > > Tyson Scott - CCIE #13513 R&S and Security Technical Instructor - > IPexpert, Inc. > > Telephone: +1.810.326.1444 > Cell: +1.248.504.7309 > Fax: +1.810.454.0130 > Mailto: [email protected] <mailto:[email protected]> > > Join our free online support and peer group communities: > http://www.IPexpert.com/communities > <http://www.ipexpert.com/communities> > > IPexpert - The Global Leader in Self-Study, Classroom-Based, Video > On Demand and Audio Certification Training Tools for the Cisco CCIE > R&S Lab, CCIE Security Lab, CCIE Service Provider Lab , CCIE Voice > Lab and CCIE Storage Lab Certifications. > > > -----Original Message----- > From: Kim Pedersen [mailto:[email protected] > <mailto:[email protected]>] > Sent: Monday, June 08, 2009 2:02 PM > To: Tyson Scott > Cc: 'Bryan Bartik'; [email protected] > <mailto:[email protected]> > Subject: Re: [OSL | CCIE_RS] ACL Wildcards > > Hi Tyson, > > In my example, those 4 bits are just in the first octet alone. So > im assuming we really need to treat the entire address, and not just > by > > > octet? > > > So there's no "set-in-stone" rules to go by, you just sort of have > to group them, see if that matches and go from there? > > Finally, in my example, if i add the 193 prefix, I would have 6 > bits of difference, so the closest i could do in one line is by > matching 64 nets, and this would give an indication on whether i > need to narrow it > > > down? > > > Sincerely, > Kim > > Tyson Scott wrote: > > > > Kim > > When it has a large amount of differences you need to find > similarities between them to put them together > > 194 is 11000010 > 174 is 10101110 > > This is 4 bit differences so you would have to have 16 entries to > match > > > > them > > > > as one line without matching additional subnets > > It is important to also note if they say to not match any > additional networks or if they just say to combine them to as few > lines without specifying that you can't match additional networks as > > well. > > Regards, > > Tyson Scott - CCIE #13513 R&S and Security Technical > Instructor - > IPexpert, Inc. > > Telephone: +1.810.326.1444 > Cell: +1.248.504.7309 > Fax: +1.810.454.0130 > Mailto: [email protected] <mailto:[email protected]> > > Join our free online support and peer group communities: > http://www.IPexpert.com/communities > <http://www.ipexpert.com/communities> > > IPexpert - The Global Leader in Self-Study, > Classroom-Based, Video > On > > > > Demand > > > > and Audio Certification Training Tools for the Cisco CCIE R&S Lab, > CCIE Security Lab, CCIE Service Provider Lab , CCIE Voice Lab and > CCIE Storage Lab Certifications. > > > -----Original Message----- > From: [email protected] > <mailto:[email protected]> > [mailto:[email protected] > <mailto:[email protected]>] On Behalf Of Kim > Pedersen > Sent: Monday, June 08, 2009 11:28 AM > To: Bryan Bartik > Cc: [email protected] > <mailto:[email protected]> > Subject: Re: [OSL | CCIE_RS] ACL Wildcards > > Hi Bryan, > > I guess I didnt point out the problem (sounds soo serious :) ), > but what if the question states: "make these into as few > entries as > possible", and they are soo different that it might not end up in > one entry (again, with difference in multiple octets). > > For example (no logic behind choosing these): > 194.64.0.96/27 <http://194.64.0.96/27> > 174.34.87.64/26 <http://174.34.87.64/26> > 193.23.10.8/30 <http://193.23.10.8/30> > ... > Next, imagine 32 addresses just like this :) > > How do you go about breaking all of this down? > > Sincerely, > Kim Pedersen > > Bryan Bartik wrote: > > > > > Kim, even if there is more than one octet you still can look at > the number of bits that are different. Example: > > 192.168.0.0 > 192.168.0.1 > 192.168.1.0 > 192.168.1.1 > > The above addresses have 2 bits (bit 0 in the 3rd and 4th octets) > that differ and we can combine them in one ACL. > > 3rd and 4th octets: > 0000 0000 | 0000 0000 > 0000 0000 | 0000 0001 > 0000 0001 | 0000 0000 > 0000 0001 | 0000 0001 > > 0000 0000 | 0000 0000 AND > 0000 0001 | 0000 0001 XOR > > 192.168.0.0 0.0.1.1 would be the ACL entry. > > -hth > > Bryan Bartik > CCIE #23707 (R&S), CCNP > Sr. Support Engineer - IPexpert, Inc. > URL: http://www.IPexpert.com <http://www.ipexpert.com/> > > On Mon, Jun 8, 2009 at 7:47 AM, Rodriguez, Jorge > <[email protected] > <mailto:[email protected]> > <mailto:[email protected] > <mailto:[email protected]>>> wrote: > > Jeremy this should help you in doing the calculating wildcard > mask > > > > http://www.internetworkexpert.com/resources/01700370.htm > > > > > > > > > http://blog.internetworkexpert.com/2007/12/26/q-how-do-i-compute-com > p > l > ex-wil > > > > dcard-masks-for-access-lists/ > > > > > > > Rgds > > Jorge > > > > *From:* [email protected] > <mailto:[email protected]> > <mailto:[email protected] > <mailto:[email protected]>> > [mailto:[email protected] > <mailto:[email protected]> > <mailto:[email protected] > <mailto:[email protected]>>] *On Behalf Of > *JEREMY FURR (RIT Student) > *Sent:* Friday, June 05, 2009 10:12 AM > *To:* [email protected] > <mailto:[email protected]> > > > > <mailto:[email protected] > <mailto:[email protected]>> > > > > *Subject:* [OSL | CCIE_RS] ACL Wildcards > > > > Does anyone know of a website or book that explains well > how ACL > wildcards work? I have been trying to filter out four > blocks from > a bunch of route advertisments but just can't get the three I > > want > > through, this is what I have R2 is originating > 192.168.2.0/24 <http://192.168.2.0/24> > <http://192.168.2.0/24> through 192.168.15.0/24 > <http://192.168.15.0/24> > <http://192.168.15.0/24> in RIP to R1. I want to > only accept > blocks 192.168.5.0, 192.168.10.0, 192.168.13.0 and > 192.168.14.0 > > > > If I use acl with 192.168.10.0 0.0.4.0, I will get > 10 and 14 but > not thirteen. For the 5 network I just use the > 192.168.5.0 > 0.0.0.255. > > > > Any thoughts or help would be appreciated. > > > > Jeremy Furr > > [email protected] <mailto:[email protected]> > <mailto:[email protected] <mailto:[email protected]>> > > > > > -- > > > > > > > > > > > > > > > > -- > > // Freedom Matters > // Follow my progress on: http://kpjungle.wordpress.com > <http://kpjungle.wordpress.com/> > > > No virus found in this incoming message. > Checked by AVG - www.avg.com <http://www.avg.com/> > Version: 8.5.339 / Virus Database: 270.12.43/2139 - Release Date: 06/08/09 > 06:01:00 > -- // Freedom Matters // Follow my progress on: http://kpjungle.wordpress.com
