The Journey of a Network Engineer:

transparent

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May 9, 2012  6:45 AM

How bridging works in Cisco routers?



Posted by: Sulaiman Syed
bridge, Cisco, router, routing, transparent

One of the layer two technologies that the CCIE candidate can face is bridging. What bridging does is that it transforms the Router's behavior of IP routing into a switch like behavior. The underlying commands are same, they differ when use different modes of Bridging on the router. There are...

February 16, 2012  12:03 AM

Moving from Explicit Proxy to Transparent Proxy – part 4



Posted by: Sulaiman Syed
Cisco, Citrix, explicit, PBR, proxy, proxysg, router, switch, transparent

We have reached into a finalized design to run transparent proxy setup. The figure below shows the network diagram.

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January 1, 2012  8:05 AM

Moving from Explicit Proxy to Transparent Proxy – part 3



Posted by: Sulaiman Syed
6500, BlueCoat, Cisco, design, network, packeteer, packetshaper, paloalto, proxy, transparent

While we had overall idea of the design direction, we have identified other points that were integrated into the final design. The diagram below shows the almost finalized design.


December 27, 2011  1:11 AM

Moving from Explicit Proxy to Transparent Proxy – part 2



Posted by: Sulaiman Syed
Cisco, design, explicit, Firewall, network, PBR, proxy, router, switch, transparent

If you have read the first part of this series, you would know that there is major upgrade plan move from explicit proxy...


December 25, 2011  4:42 AM

Moving from Explicit Proxy to Transparent Proxy – part 1



Posted by: Sulaiman Syed
bridge, Cisco, explicit, PBR, proxy, router, switch, transparent, WCCP

Proxy can  be implemented in either a explicit or transparent mode. The deployment of proxy (network logical location) can be either in-line (bridge) or out-line. Since we are planning to more from the explicit mode to transparent mode, various changes are required to be done, on both network...


March 22, 2011  7:30 AM

Configuring IP DHCP Snooping.



Posted by: Sulaiman Syed
binding, Cisco, configuration, dhcp, ip, mode, option 82, snooping, switch, transparent, vlan, vtp

The other day, a smart user (i consider him evil) attached a ADSL modem to the network port. What he didn't realize that his device was programmed to work as DHCP server. As a result, the whole vlan started getting the wrong IP address, and connectivity was lost. After investigation, we realized a...


February 23, 2011  5:29 AM

How to design transparent proxy?



Posted by: Sulaiman Syed
Cisco, design, in-line, network, PBR, proxy, router, transparent, WCCP

Almost every organization uses proxy. The benefits of proxy servers are countless. Some of these benefits are mentioned:

  • Add Accounting
  • Add Authorization
  • Reduce the load on the external (wan) link
When the proxy is installed in transparent setup. it...


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