Question

Setting up Access List on Catalyst 4506, IOS version 12.1(20)EW2

Asked by: zdkev

I am setting up two external and one internal networks on a Catalyst 4506.  

Internal Network:  VLAN1 -  172.16.0.0/16
External Network: VLAN2 - 10.138.56.79/24
                 VLAN3 - 10.138.58.161/28

How do I set up access list to prevent the two external networks from talking to the internal networks?  I know on a router, I don't need to set up
access list to achieve this.  



 

This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.

Subscribe now for full access to Experts Exchange and get

Instant Access to this Solution

  • Plus...
  • 30 Day FREE access, no risk, no obligation
  • Collaborate with the world's top tech experts
  • Unlimited access to our exclusive solution database
  • Never be left without tech help again

Subscribe Now

Asked On
2005-10-17 at 20:05:06ID21598353
Tags

4506

,

catalyst

,

access

,

list

Topic

Miscellaneous Networking

Participating Experts
2
Points
500
Comments
7

Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.

  • "The time we save is the biggest benefit of Experts Exchange to Warner Bros. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange." Mike Kapnisakis, Warner Bros.
  • "Our team likes having a resource that is more secure than just using Google and most experts using this service really know their stuff. It's nice to look here first versus using Google." Dayna Sellner, Lockheed Martin
  • "Anytime that I've been stumped with a problem, 9 out of 10 times Experts Exchange has either the accepted solution or an open discussion of the potential solution to the problem." Kenny Red, eBay Inc.

See what Experts Exchange can do for you.

Got a question?

We've got the answer.

Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.

Screenshot of Experts Exchange Knowledgebase

Need individual assistance?

Our experts are ready to help.

If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.

Screenshot of Experts Exchange Knowledgebase

Want to learn from the best?

Read articles from industry experts.

Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.

Screenshot of an Article

Working on a long term project?

Store your work and research.

Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.

Screenshot of Experts Exchange Knowledgebase

Access the answers to your technology questions today.

Subscribe Now

30-day free trial. Register in 60 seconds.

What Makes Experts Exchange Unique?

Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.

Trusted by the world's most respected brands.

image of each brand's logo

Faithfully serving IT professionals since 1996.

Experts Exchange Logo

Try it out and discover for yourself.

Subscribe Now

30-day free trial. Register in 60 seconds.

Related Solutions

  1. VLAN configuration on Catalyst 6500 series switch
    Hi All I have configured the basic configuration on catalyst 6500 series switch.Now i would like to configure vlans ,by default ip address configured on SC0 interface is for VLAN 1.I want to know how to configure ip address for other VLANS. Can someone guide me with sample ...
  2. InterVLAN routing question on Catalyst 5000 with RSM
    Hello, I am trying to set up a Cisco catalyst 5000 switch with a Route Swtich Module (RSM) installed but am having trouble finding something out. I dont have much experience in what the RSM can do in a Cat5000 so pardon the basic question. The way I am planning to set u...
  3. DMZ on 2811 and Catalyst 2970
    I have a Cisco 2811 with a Cisco 3640. Both are doing GLBP for my Load Balancing and Fail Over. These 2 routers are connected to my Catalyst 2970 24-port Gigabit. Port 1 is my 2811 router and port 2 is my 3640 router. Ports 1-22 are under VLAN1 and port 23 is VLAN2. VLAN...
  4. Cisco Catalyst 3750 ip routing
    Hey I got a Cisco Catalyst 3750 with 2 VLANs VLAN1 = 192.168.12.0/24 VLAN2 = 192.168.2.0/24 Im trying to route between these VLANS what exactly should I set up to get VLAN1 Communicate with VLAN2

Free Tech Articles

  1. WARNING: 5 Reasons why you should NEVER fix a computer for free.
    It is in our nature to love the puzzle. We are obsessed. The lot of us. We love puzzles. We love the challenge. We thrive on finding the answer. We hate disarray. It bothers us deep in our soul. W...
  2. SCCM OSD Basic troubleshooting
    SCCM 2007 OSD is a fantastic way to deploy operating systems, however, like most things SCCM issues can sometimes be difficult to resolve due to the sheer volume of logs to sift through and the dispe...
  3. Migrate Small Business Server 2003 to Exchange 2010 and Windows 2008 R2
    This guide is intended to provide step by step instructions on how to migrate from Small Business Server 2003 to Windows 2008 R2 with Exchange 2010. For this migration to work you will need the fo...
  4. Create a Win7 Gadget
    This article shows you how to create a simple "Gadget" -- a sort of mini-application supported by Windows 7 and Vista. Gadgets can be dropped anywhere on the desktop to provide instant information, ...
  5. Outlook continually prompting for username and password
    There have been a lot of questions recently regarding Outlook prompting for a username and password whilst using Exchange 2007. There are a few reasons why this would happen and I will try to cover t...
  6. Backup Exchange 2010 Information Store using Windows Backup
    There seems to be quite a lot of confusion around the ability to backup Exchange 2010 using the built in Windows Backup feature. This stems from the omission of this feature prior to Exchange 2007 s...

Cloud Class Webinars

  1. Avoiding Bugs in Microsoft Access
    Alison Balter takes and in-depth look at avoiding bugs in Access. In this webinar you will learn about using the immediate window to debug your applications, invoking the debugger, using breakpoints to troubleshoot, stepping through code, setting the next statement to execute, ...
  2. Top 10 Best New Features in Visio 2010
    Scott Helmers gives live demonstrations of the top 10 new features in Visio 2010. This webinar will teach you how to create compelling diagrams by adding shapes to the page with a single click, linking the shapes in a diagram to data in Excel (or SQL Server, or SharePoint), ...
  3. IT Consultant Business Secrets Revealed
    Michael Munger, Experts Exchange tech pro and IT consultant, pulls back the curtain on his very successful businesses and answers question on every IT consultant and business owner should know about. He shares secrets on what he did to solve the 5 most common problems in IT, ...
  4. Disaster Recovery and Business Continuity
    Quest CTO, Mike Billon, gives an overview of the steps involved in building a dunamic disaster recovery plan. Through case studies and an examination of software/hardware tooles for monitoring and testing, you'll gain a better understandin of where you are, where you want ...
  5. Organize Your Visio Diagrams with Containers and Lists
    Scott Helmers uses cross functional flowcharts, wireframe diagrams, data graphic legends and seating charts to teach you: how to ustilize all three new structured diagram components in Visio 2010, the best practices for organizeing shapes in previous version of Visio, how to organize ...
  6. How to Us Objects, Properties, Events and Methods in Microsoft Access
    Alison Dalter gives an in-depbth look at objects, properties, events and methods in Microsoft Access. In this webinar you will learn about using the object browser, referring to objects, working with properties and methods, working with object variables, understanding the ...

Join the Community

Give a Little. Get a Lot.

Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.

Join the Community

Answers

 

by: photograffitiPosted on 2005-10-17 at 23:46:23ID: 15105180

Actually, on a router you would indeed have to set up an ACL to achieve this. The 4506 configuration would be the same as it would be on a router. The ACL would just be applied to a VLAN interface as opposed to a FastEthernet/Ethernet/Serial interface on the router. The PIX firewall is the one that blocks traffic by default from a low security to a high security interface.
The ACL you would need would be something like:
!
access-list 101 deny 10.138.56.79 0.0.0.255 172.16.0.0 0.0.255.255
access-list 101 permit 10.138.56.79 0.0.0.255 any
access-list 102 deny 10.138.58.161 0.0.0.15 172.16.0.0 0.0.255.255
access-list 102 permit 10.138.58.161 0.0.0.15 any
!
interface VLAN2
   ip access-group 101 in
!
interface VLAN3
   ip access-group 102 in

 

by: harbor235Posted on 2005-10-18 at 04:06:49ID: 15106192

The ACL needs to reflect which protocol to filter:

access-list 101 deny IP 10.138.56.79 0.0.0.255 172.16.0.0 0.0.255.255 log-input
access-list 101 permit IP 10.138.56.79 0.0.0.255 any
access-list 102 deny IP 10.138.58.161 0.0.0.15 172.16.0.0 0.0.255.255 log-input
access-list 102 permit IP 10.138.58.161 0.0.0.15 any
!
interface VLAN2
   ip access-group 101 in
!
interface VLAN3
   ip access-group 102 in

The log-input added to the end of the deny ACL entries are a great tool to view what is being dropped.


harbor235 ;}

 

by: zdkevPosted on 2005-10-18 at 05:20:47ID: 15106590

Thank you both for your answers.  Hope I was fair in splitting the points.
I gave photograffiti the benefit of the doubt that he did meant IP as the protocol filter.

 

by: zdkevPosted on 2005-10-18 at 06:00:52ID: 15106904

My switch already has the following access-list:

access-list 102 permit udp any any range 16384 32767
access-list 103 permit tcp any eq 1720 any
access-list 103 permit tcp any any eq 1720
access-list 103 permit tcp any any range 2000 2002

Will there be any conflicts if I add the above access list?  Thanks.

 

by: photograffitiPosted on 2005-10-18 at 06:48:17ID: 15107346

Hahah. Sorry. Yeah, I meant IP. That's what I get for doing that at 2 in the morning.
The ACL will indeed conflict because you can only have one ACL in a specific direction applied to an interface. That means you will likely have to augment your current ACL which means the current lines are read before the new ones you add. Make sure that matches with what you're trying to block and allow.
I suggest you remove the old ACL and rebuild a new one taking into account your old one and the new rules you need to apply.

 

by: zdkevPosted on 2005-10-18 at 07:07:56ID: 15107606

Couldn't I just keep the existing access lists and edit the new lists as follow?  Will this work?

access-list 102 permit udp any any range 16384 32767
access-list 103 permit tcp any eq 1720 any
access-list 103 permit tcp any any eq 1720
access-list 103 permit tcp any any range 2000 2002
!
access-list 104 deny IP 10.138.56.79 0.0.0.255 172.16.0.0 0.0.255.255 log-input
access-list 104 permit IP 10.138.56.79 0.0.0.255 any
access-list 105 deny IP 10.138.58.161 0.0.0.15 172.16.0.0 0.0.255.255 log-input
access-list 105 permit IP 10.138.58.161 0.0.0.15 any
!
interface VLAN2
   ip access-group 104 in
!
interface VLAN3
   ip access-group 105 in

 

by: photograffitiPosted on 2005-10-18 at 07:33:36ID: 15107850

Sure it will. I thought you meant that the ACL 102 and 103 were already applied to the same interfaces. If not then it will not interfere.

20120131-EE-VQP-002

3 Ways to Join

30-Day Free Trial

The Experts

98% positive feedback on 31,087 answers since March 2000. angeliii is a Microsoft Most Valuable Professional for his work with MS SQL Server & Develoment.

He has also proven his knowledge of Visual Basic Programming, PHP Scripting and Oracle Databases.

The Experts

97% positive feedback on 10,752 answers since July 2000. lrmoore has more than 18 years experience in the networking industry.

The six-time Mircosoft MVPs specialties include firewalls, virtual private networking, and network management.

Testimonials

"...and excellent source for support... Kind of like having your very own IT dept." Electriciansnet

Testimonials

"I was apprehensive at signing up at first. However... it has already made my life as an IT administrator much easier." JaCrews

Testimonials

"WOW! You guys have great, active, and knowledgeable people on here." moore50

Business Clients

Business Clients

In the Press

"If you’ve got a question... Experts Exchange can supply an answer.”

In the Press

"...an invaluable aid for both IT professionals and those who require tech support."

In the Press

"where IT professionals provide quick answers on just about any topic"

Business Account Plans

Loading Advertisement...