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Questions tagged [dhcp-snooping]

For questions about DHCP Snooping on Network devices. For instance, you want to setup DHCP Snooping on your user access VLAN, but don't know how and need help.

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Customized captive portal with external DHCP server [closed]

I am stuck in one issue for which I need your help on this. Actually its bit complex to explan about my situatuion but I will try my best. I am working on customized captive portal on arm processor ...
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Why do Cisco IOS switches send packets to DHCP servers with zero giaddr field when DHCP snooping is on?

I recently troubleshooted a network where the switch had DHCP snooping turned on and even though the router which was acting as a DHCP server was connected to a trusted port, the client wasn't able to ...
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117 views

How to avoid end-user connect their wireless router?

I just replaced our network gears with Aruba 2930f. I had gone through all basic security such as DHCP snooping, DHCP trusted port and BDPU. One thing I don't know if I am able to shut down the sw ...
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256 views

Dynamic ARP Inspection + IP Source Guard (without DHCP Snooping)

Consider the following scenario I have 2 switches, A and B connected via Po1 (LACP). IP DHCP Snooping turned on for both Switch-A and Switch-B. Dynamic ARP Inspection trust is configured on (Ppo1) on ...
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3answers
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DHCP snooping problem

I have some problems with a very simple DHCP snooping configuration. I'm using a very simple topology using router on a stick. I use VLAN 10 and VLAN 20. My Clients can get DHCP from my router when ...
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837 views

DHCP Snooping on HP 2510 or alternate

Recently encountered issue of Rogue DHCP, so wanted to protect my network by implementing DHCP snooping. Have HP 2510 Switches installed, but after searching the internet i found that HP 2510 switches ...
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1answer
455 views

DHCP snooping not blocking rogue server

Everything I've read on this says this should work, but for some reason it's just not happening. I've got a switch connected to a DHCP server (192.168.10.3) in VLAN 10, and two machines in VLAN 7: a ...
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Dynamic ARP Inspection ports err-disable with %SW_DAI-4-PACKET_RATE_EXCEEDED

Ports in my network on random switches(connected to Windows 7 workstations) are going into err-disable because of dynamic arp inspection. Ports are going into err-disable because there are too many ...
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1answer
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arp inspection with dhcp snooping

My network Figure is : In this figure switch 3750 is my main switch and all of ACL and vlaning and DHCP server and... comands are in this switch. I want set ARP inspection configs for security in my ...
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1answer
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DHCP-Snooping on 3com S4210

I'm setting up dhcp snooping with IP source guard and DAI on some 3com S4210 switches. I found problem with recording bindings in snooping database. In some cases I know that there is PC connected to ...
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1answer
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Establishing IP DHCP Snooping

Have establsihed a lab to test IP DHCP SNOOPING prior to implemntation. So far everything works as advertised. Given that the Uplink port of a switch must be trusted, why is it not necessary to add ...
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DHCP Snooping Confusion

I'm trying to work out how to enable dhcp snooping and dynamic arp inspection on our guest network and I'm a little confused.... Here's the situation: We have a hub and spoke topology, with a ...