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Understanding DHCP

DHCP (Dynamic Host Configuration Protocol) is one of the most common protocols that everyone understand what it does. But very few of them spend time to learn how it work. So in this post we will look...

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Understanding DHCP Snooping

As outlined in my previous post (Understanding DHCP)  DHCP discovery & DHCP request packets coming from a client destine to layer 2/3 broadcast. Therefore these packets will reach every host in...

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Understanding DHCP Option 82

In this post we will see how DHCP option 82 works. The DHCP Information option (Option 82) is commonly used in large enterprise deployments to provide additional information on “physical attachment” of...

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WLC – DHCP Option 82 Configuration Example

In this post we will do a configuration example for DHCP option 82 in WLC 7.0.116.0 release. (later releases have additional options & refer specific config guides). As you aware with DHCP option...

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Hex to String Conversion

When I play with DHCP option-82 feature in WLC came across an option that I can set “AP-MAC:SSID” as remote id. Rather than rely on the debug output I wonder I could get the hex value of that...

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IOS DHCP Add. Reservation

IP Address reservation is a commonly used feature in any DHCP deployment. You may want to have fixed IPs for certain hosts (like printers, BMS devices) without configuring them for static IPs. All...

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