Yes it was the SP,
Thank you. 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> 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: 'Segun Daini [mailto:[email protected]] Sent: Monday, October 05, 2009 9:27 AM To: Wayne Lawson; Tyson Scott Cc: <[email protected]>; [email protected] Subject: Re: [OSL | CCIE_Security] Transparent firewall with trunking Congrats Tyson!!!...let me guess SP?? _____ From: Wayne Lawson <[email protected]> To: Tyson Scott <[email protected]> Cc: "<[email protected]>" <[email protected]>; "[email protected]" <[email protected]> Sent: Monday, October 5, 2009 2:24:32 PM Subject: Re: [OSL | CCIE_Security] Transparent firewall with trunking Tyson - Update your signature to reflect your THIRD CCIE! Congrats again! ;-) Regards, Wayne A. Lawson II - CCIE #5244 Founder & President - IPexpert, Inc. Mailto: [email protected] Mobile: +1.810.334.1564 :: Message sent from iPhone. On Oct 5, 2009, at 9:14 AM, "Tyson Scott" <[email protected]> wrote: Nabil, That is right on. The same concept when using the IPS. Just change ASA to IPS in the middle and the concept is the same for inline or inline VLAN pair. 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> 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 Nabil Omar Sent: Monday, October 05, 2009 8:50 AM To: [email protected] Cc: [email protected] Subject: Re: [OSL | CCIE_Security] Transparent firewall with trunking The reason for using two Vlans I think is a matter of Design , that is used to avoid bypassing the Firewall . Because usually in real life you have the Vlans spanned across all the switches , So if somebody messed the cabling , and for example connected the two switches together with a cable , in this case if The INSIDE and OUTSIDE are in the Same vlan , The user will be able to communicate with the outside without any restriction (bypassing the Firewall ) , But if they are in different vlans they will not be able to communicate Unless through the Firewall , Because it is Bridging between though two vlans. That is my opinion , Correct my If I am wrong . Scenario with Same Vlans on both Sides switch ---- trunk-------------ASA ------trunk-------------switch | | ----------------------------------------------------------- Wrong Cabled Trunk Link vlan 2 - 10.20.30.0 vlan 2 - 10.20.30.0 vlan 3 - 20.10.30.0 vlan 3 - 20.10.30.0 Best Regards Nabil _____ Date: Mon, 5 Oct 2009 16:50:22 +0530 From: [email protected] To: [email protected]; [email protected]; [email protected] CC: [email protected] Subject: Re: [OSL | CCIE_Security] Transparent firewall with trunking Thanks to all for your inputs. I just wanted to do some investigation in my lab before replying. Various cases IPS (inline) is transparent and doesn't disturb the setup switch ---- trunk-------------IPS ------trunk-------------switch vlan 2 - 10.20.30.0 vlan 2 - 10.20.30.0 vlan 3 - 20.10.30.0 vlan 3 - 20.10.30.0 Switch is transparent and doesn't disturb the setup switch ---- trunk-------------switch ------trunk-------------switch vlan 2 - 10.20.30.0 vlan 2 - 10.20.30.0 vlan 3 - 20.10.30.0 vlan 3 - 20.10.30.0 Tranparent firewall ASA requires for vlans switch ---- trunk-------------ASA ------trunk-------------switch vlan 2 - 10.20.30.0 vlan 6 - 10.20.30.0 vlan 3 - 20.10.30.0 vlan 7 - 20.10.30.0 I was about to talk about the trunking inspection done by IPS sensor. With IPS sensor, if you need to monitor the traffic between a trunk link, you need to just configure an inline pair interface and insert the two trunk links from the two switches into two interfaces of the sensor that has been paired. Here I need not disturb the swtich setup. It is very transparent. If you want, you can use vlan groups and put each sub-interfaces in different virtual sesnor. But when it comes to ASA for the above topology where IPS sensor was placed it, we need to bridge between different vlans. I am actually aware of that we need different vlans when we put ASA in between a trunk. But I am actually searching for a reason from anyone of why did Cisco implement this way of requiring two vlans and thereby forcing one of swtiches to their vlan for inserting the ASA in between. With IPS sensor, the job was easy. With ASA, I need to reconfigure the vlans on switches. With IOS router or ASA in routing mode, is it inter-vlan routing there we definitely need different vlans to route between vlans. But with transparent firewall, why do we need different vlans for bridging a subnet. Transparent means plug and play, right? I just wanted others thoughts on this Cisco's way of implementation to be sure that I remove the mis-understanding from my mind. So I have posted this mail here. With regards Kings On Mon, Oct 5, 2009 at 12:06 AM, Paul Stewart <[email protected]> wrote: In my opinion, the best example of transparent firewalling in the way described is vlan pairs on the IPS appliance. The concept of using transparent Firewall to bridge two VLANs is exactly the same as using a VLAN pair on an IPS to bridge two vlans. In both cases, both of the vlans exist in the same layer 3 subnet. However, for devices in vlan x to talk to devices in vlan y, they must go through the transparent firewall, just like they would have to go through the IPS. The IPS simply has a less strictly defined role than that of a firewall. _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com _____ Keep your friends updated— even when you’re not signed in. <http://www.microsoft.com/middleeast/windows/windowslive/see-it-in-action/social-network-basics.aspx?ocid=PID23461::T:WLMTAGL:ON:WL:en-xm:SI_SB_5:092010> _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
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