How config dynamic arp inspection for 300 or 500 series ?

Hi Cisco Expert ,
How config dynamic arp inspection for 300 or 500 series ? Do you have clearly document for this solution ? Could you please to share ?
i find in admin guide it's no simple to do
Thank you for kindly support.

Hi Siriphan, using the command line is the easiest way to deal with this.
You need to understand the difference between trusted and untrusted interfaces. The untrusted interfaces are the ports that will be inspected and if not specified within the arp entry list then will get dropped.
Any port you do not want arp inspection to be a part of, you need to trust that port.
Below is how to make a port trusted.
configure terminal
interface fe1
ip arp inspection trust
Once you establish the trusted ports, you can build your arp list.
configure terminal
ip ap inspection list create ARP_INSPECTION (the word after the create can be anything you want)
ip 192.168.100.3 mac-address 64:31:50:1c:50:a1
This is the example of adding 1 entry to your arp list. You can add128 of these entries. These IP/mac binds are the devices that are "safe" from being dropped.
Lastly, you need to enable the arp inspection globally. You DO NOT want to toggle the arp inspection without establishing your interfaces or bind list. If you do not establish your trust interfaces and list first, you will lock down any connection through the switch and essentially brick it.
To toggle the global arp inspection
configure terminal
ip arp inspection
Once you're done, save your running config to the start up config.
-Tom
Please mark answered for helpful posts

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Is Dynamic ARP inspection possible to be done on wifi routers? I'm asking because I can't find any model with that feature. I would especially be interested in some cheaper models for home or small business use (maybe Linksys).

You could be better served posting this on the SOHO forum. Speaking to enterprise gear like the cisco WLC yes.
DAI for Wireless Access
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It is possible to enable DAI for each VLAN configured on a trunk between a FlexConnect and access point. Therefore, DAI is useful in wireless deployments where multiple SSIDs/VLANs exist on an FlexConnect. However, in an FlexConnect WLC deployment, there are two topologies that impact the effectiveness of the DAI feature. Both topologies assume that the attacker is associated to a FlexConnect WLC and is Layer 2-adjacent to the targets:
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Mobility/emob73dg/emob73/ch4_Secu.html#pgfId-1019449

Help understanding DHCP Snooping and Dynamic ARP Inspection

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HI Ezra,
In simple words:
DHCP Snooping is a feature which is available on switches. This feature is used to prevent rogue dhcp server attacks.
In the diagram, a valid dhcp server is connected to the network. The computers are suppose to receive dynamic ip addresses from the valid server. An attacker implants a rogue dhcp server on the network as shown in the diagram. The following steps are followed for a client to receive an ip address from a dhcp server.
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DAI:
Please read the expalined version from here: http://ciscocertstudyblog.blogspot.de/2010/06/ciscoblogpics.html
More about DHCP snooping and DAI: Please read this attached document with some detailed explanation.
Hope it helps.
Regards
Please use rating system and mark athe question answered it may help others.

Dynamic ARP inspection rate limit issues with Windows Vista Systems

Good Day to everybody.
I had implemented DHCP Snooping & Dynamic ARP inspection feature to mitigate ARP spoofing attacks to one of customer location where we have mix of Windows vista & XP systems. By default DAI feature rate limit ARP packets on un-trusted ports to 15 Packets per second. With this value I was facing some issue to access file shares where port will go in error-disabled state due to ARP broadcast from system was crossing 15 PPS limit of DAI. For the same, I had increased the DAI limit to 64 & after that we had not facing this problem from windows XP systems, but windows vista systems are still giving problem. Also this probem is very random in nature & not all the windows Vista system will face same issue even though they are accessing same file share & are configured with same DAI rate limit.
That's why I am not able to figure out baseline values for DAI rate limits. I had already search microsoft documentation for limiting this ARP broadcast from Windows Vista system, but no luck.
Is there any way to find out correct settings for this DAI packet rate limiting in Windows Vista enviorement ?

Hello bensyseng,
check out this thread.
As topmahof said already it could correlate with a wrong Intel driver.
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?? thanks

HI d.pennington,
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Do sg200-50 support dhcp snooping or dynamic arp inspection (DAI) ?

do the sg200-50 switches support:
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dynamic arp inspection
?? thanks

HI d.pennington,
SG200 is L2 switch only. so this mean switch not support dhcp snooping. Switch support IGMP snooping, Switch support dynamic arp table. You can management switch with web page GUI only (CLI) not supported.
Thanks,
Moh

Dynamic ARP Inspection (DAI)

Can someone point me to step-by-step configuration guide of how to enable DAI on Cisco Catalyst 6500 Series Switches.
Thanks

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Hi Dennis,
Thanks for your answer. But the programs download from the website that you provide dosen't work. I compiled my own program, and I just want to display the waveforms of the TDS 520D on my labview program on my computer.
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Hi Thuc,
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Hi Gunnar,
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How To Dynamically specify ArchiveDirectory for SyncRead operation in SOA11g

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How does Dynamic Quorum work for a two Node DAG

Hi All,
I have a two node DAG with a FS witness server. One of the node is 'down' (I have kept it like that), cluster has quorum and all services are online.
What I'm trying to understand is if a node's State=Down, isn't the Dynamic Quorum Group Manager suppose to trigger and set the DynamicWeight to '0' for that server.
In my case its not doing so, please let me know if this the way it is, or something is not quite right and I need to fix it.
Troubleshooting info below:
PS C:\Windows\system32> Get-ClusterNode | ft name, dynamicweight, state, nodeweight,id -AutoSize
Name DynamicWeight State NodeWeight Id
exch1 1 Down 1 1
exch2 1 Up 1 2
PS C:\Windows\system32> (Get-Cluster).WitnessDynamicWeight
1
PS C:\Windows\system32> Get-ClusterResource
Name State OwnerGroup ResourceType
Cluster IP Address Online Cluster Group IP Address
Cluster Name Online Cluster Group Network Name
File Share Witness (\\fs1... Online Cluster Group File Share Witness
(Validation test)
Validate Quorum Configuration
Description: Validate
that the current quorum configuration is optimal for the cluster.
Validating cluster quorum settings.
Witness Type: File Share Witness
Witness Resource: \\fs1.contoso.com\dag1.contoso.com
Cluster managed voting: Enabled
Voter Name
State
Assigned Vote
Current Vote
File Share Witness (\\fs1.contoso.com\dag1.contoso.com) (\\fs1.contoso.com\dag1.contoso.com)
Online
1
1
exch1
Down
1
1
exch2
Up
1
1
This quorum model will be able to sustain failures of 1 node(s) if the file share witness remains available
and 0 node(s) when the file share witness goes offline or fails.
This quorum configuration can be changed using the Configure Cluster Quorum wizard. This wizard can be started from the Failover
Cluster Manager console by selecting the cluster name in the left hand pane, then in the right "actions" pane selecting "More Actions..." and then selecting "Configure Cluster Quorum Settings...".
When all servers were up
node/2+1 = 2/2+1=2 required for quorum and we have 3 votes
When 1 server gone 1/2+1=1 quorum should recalculate to this. But its still considering 3 votes out of 1down server+1up server+1witness. Ideally I should be able to loose the witness too aftersome time and still maintain quorum(unlike what
the validation test is saying).
Regards,
Satyajit
Please “Vote As Helpful”
if you find my contribution useful or “Mark As Answer” if it does answer your question. That will encourage me - and others - to take time out to help you.

Hi Simon,
Thanks for your response.
I have done some study, testing and what I figured out is this.
Split brain syndrome is prevented by always requiring a majority of the DAG members (and in the case of DAGs with an even number of member, the DAG witness server) to be available and interacting for the DAG to be operational.
All DAGs with an even number of members must use a witness server.
Hence a 3 node cluster behaves differently than a 2 node. Exchange 2013 DAG kind of forces you to have a witness server always.
You can specify only a name for the DAG and leave the Witness server and
Witness directory fields empty. In this scenario, the task will search for a Client Access server that doesn't have the Mailbox server role installed. It will automatically create the default witness directory and share on that Client Access
server and configure the DAG to use that server as its witness server.
You can
'overridde the quorum configuration using Windows2012 Failover Cluster Manager', however using it to modify a DAG is not recommended.
If you open Failover Cluster Manager in Administrative Tools, you’ll find the Database Availability Group (DAG), cluster networks and so on. Don’t try to manage the DAG
using the Failover Cluster Manager, as this isn’t supported. The Exchange Management Console (EMC) or the Exchange Management Shell (EMS) are the only ways to manage the DAG.
Unless you’re doing a DC switchover and/or being assisted by Microsoft Support services (premier)
Now back to the point:
When we are left with 2 nodes and 1 witness server for Exchange HA. The Dynamic Quorum functionality kind of stops dealing with it. As 2nodes/2+1=2votes this means we need to have atleast 2 votes to have quorum.
So if we assume Dynamic Quorum triggers and removes 2 votes, 1 from Witness and 1 from nodeB.
Then the new formula we have is 1node/2+1=1vote which would mean this would allow us to loose both the witness and the nodeB. And nodeA will be the last man standing as in this
article.
However having this scenario in a two node cluster brings in the split-brain problem. As if there is a full disconnect of nodeA site and nodeB+Witness can talk, they form quorum , nodeB mounts the database. Which is undesirable.
Hence Dynamic Quorum keeps the votes to 3 in a 2nodes+1witness scenario contrary to what is expected and in turn keeps everything running fine till we have 2votes available, just like 2010,Windows2008 days.
Regards,
Satyajit
Please “Vote As Helpful”
if you find my contribution useful or “Mark As Answer” if it does answer your question. That will encourage me - and others - to take time out to help you.

Best practice needed: how to dynamicly change rowset for a dataTableModel

Hello creator folk,
I need an advice on the following problem.
I start from the insertUpdateDelete tutorial, and I stick to the very first part - creation of the first page with a dropdown and at table.
Now I add a second dropdown to add another control level on my table, on tripType for example - simple, it work without problem.
My problem: my dropdowns have a "off" value - that is a value indicating that the filtering according to this value should be disabled. For example, i want to filter displayed data according to person, tripType, or both.
As a result, we now have 3 different request, one with personId = ?, one with tripTypeId = ? and the last one with both. But the displayed table is the same.
I already done such a page, by using the "rendered" option: my JSP contains 3 time the same page, each with a dedicated rowset, but only one is rendered at a time. But I don't like this solution, it is a hell to maintain, and I don't want to imagine if my client ask for a third dropdow!!!
Another possibility: create a separate page for each possibility. Well, quite the same than the previous one.
Is it possible at runtime level to change the command associated to a rowset, and then to the linked RowSetDataModel? I tried the following way:
In the constructor of the page:
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                myRowSet.setCommand(REQUEST_PERSON_TRIPTYPE);
                myDataTableModel.setObject(1, this.getSessionBean1().getPersonId());
                myDataTableModel.setObject(2, this.getSessionBean1().getTripTypeId());
            } else if (isTripTypeOnly()) {
                ewslive_lasteventIlotRowSet.setCommand(REQUEST_TRIPTYPE);
                myDataTableModel.setObject(1, this.getSessionBean1().getTriptypeId());
            } else {
     // the default rowset, no change.
                myDataTableModel.setObject(1,
this.getSessionBean1().getPersontId());
            myDataTableModel.execute();And in each dropdown_processValueChange, after updating tripId or personId:
            if (isPersonAndTripType()) {
                myRowSet.setCommand(REQUEST_PERSON_TRIPTYPE);
                myDataTableModel.setObject(1, this.getSessionBean1().getPersonId());
                myDataTableModel.setObject(2, this.getSessionBean1().getTripTypeId());
            } else if (isTripTypeOnly()) {
                ewslive_lasteventIlotRowSet.setCommand(REQUEST_TRIPTYPE);
                myDataTableModel.setObject(1, this.getSessionBean1().getTriptypeId());
            } else {
          myRowSet.setCommand(REQUEST_PERSON);
                myDataTableModel.setObject(1,
this.getSessionBean1().getPersontId());
            myDataTableModel.execute();First run (one person selected by default), everything is OK. But when I change a dropdown I got an exception: the page constructor is called, all ok. The dropdown_processValueChange is called, the correct request is linked to the dataTableModel, and the function return normally, then the exception occures:
Exception Details: javax.faces.el.EvaluationException
javax.faces.FacesException: java.sql.SQLException: [OraDriver] Not on a valid row.
Possible Source of Error:
   Class Name: com.sun.faces.el.ValueBindingImpl
   File Name: ValueBindingImpl.java
   Method Name: getValue
   Line Number: 206 Help needed!!!

I've done something similar in my current app, the only difference I see being that I retrieve the value from the dropdown directly rather than going through the sessionbean as I don't need to save the selection.
I've managed to iron out all the bugs and it works well now. Not near my development machine or I'd post the code. I do have a couple of questions:
Why do you have the if/else setup in the constructor? If the page is being called for the first time I don't see why you need it.
Why do you useewslive_lasteventIlotRowSet.setCommand(REQUEST_TRIPTYPE);instead ofmyRowSet.setCommand(REQUEST_TRIPTYPE);?
I think this is causing your problem as you haven't shown where you set the datacache for myDataTableModel
to ewslive_lasteventIlotRowSet instead of myRowSet.
You can also set all of your dropdowns to use the same event handler, cuts down on the duplicate code :)

How config dynamic arp inspection for 300 or 500 series ?

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