Dynamic ARP Inspections on Wifi Routers?

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
The WLC protects against MIM attacks by performing a similar function as DAI on the WLC itself. DAI should not be enabled on the access switch for those VLANs connecting directly to the WLCs because the WLC uses GARP to support Layer 3 client roaming.
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

Similar Messages

  • Help understanding DHCP Snooping and Dynamic ARP Inspection

    Please help me to understand DHCP Snooping and Dynamic ARP Inspection.

    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.
    When a client (computer) is connected to the switch and is configured to receive a dynamic ip address from a dhcp server, the dhcp service on the client, sends out a DHCP Discover packet, searching for servers on the network. This packet is broadcast in nature. DHCP servers on the network, would respond to the DHCP Discover packet sent from the client. In the example, both the DHCP servers would respond to the DHCP discover packet. The client would process the first packet it receives. If the response send by the rogue dhcp server reaches the client first, then the computer would have an ip address provided by the rogue dhcp server.
    To prevent this, dhcp snooping is configured on the port on which the valid dhcp server is connected to. After the configuration is performed, no other ports on the switch would be able to respond to DHCP Discover packets from the clients. So even through the attacker has set up a rogue dhcp server, the port on the switch to which the attacker has connected would not be allowed to respond to DHCP discover packets. Thus dhcp snooping thwarts the attempt from the attacker in setting up a rogue dhcp server.
    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.

  • Sg200-50 support dhcp snooping and dynamic arp inspection?

    do the sg200-50 switches support:
    dhcp snooping
    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.
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    Moh

  • Jumbo frame caveat on 3750 - dynamic arp inspection

    i want to enable jumbo frame on a stacked 3750 running 12.2.25(SEB2).
    any caveats - the only caveat i found is dynamic arp inspection.

    Hello,
    There is no know problem with Jumbo/Giant frame support on 3750 platform other than the bug you reported.
    I have verified that Jumbo/Giant frame support works on 12.2(25)SED in stack configuration.
    Facts
    - The 12.2(25)SEB2 release has been deferred. Cisco advises you to upgrade to to (at least) 12.2(25)SEB3.
    http://www.cisco.com/cgi-bin/Software/Iosplanner/Planner-tool/printdefer.pl?platform=CAT3750&majorRel=12.2&release=12.2.25-SEB2&data_from=&file=12.2.25-SEB2.CAT3750.c.html
    - Jumbo/Giant frame support
    http://www.cisco.com/en/US/products/hw/switches/ps700/products_configuration_example09186a008010edab.shtml#3750
    HTH

  • Dynamic ARP inspection rate limit issues with Windows Vista Systems

    Good Day to everybody.
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    Hello bensyseng,
    check out this thread.
    As topmahof said already it could correlate with a wrong Intel driver.
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  • Do sg200-50 support dhcp snooping or dynamic arp inspection (DAI) ?

    do the sg200-50 switches support:
    dhcp snooping
    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,
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  • 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.
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    configure terminal
    interface fe1
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    configure terminal
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    ip 192.168.100.3 mac-address 64:31:50:1c:50:a1
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    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

  • 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

    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

  • Ip arp inspection limit rate

                     Hi we have configured arp packet limit is 60 packets per second but we are receiving more than 60 arp packets on port and result in to port went to error disable mode.
    config t
    int G1/0/1
    ip arp inspection limit rate 60
    Can somone know what is reason behind more than 60 arp packets within one second on user port

    I believe you also need to enable dynamic arp inspection globally for the vlan that you want to limit on, or this command doesn't work. It's like putting in all of the commands for port security; they don't do anything unless you enable port security on the port.
    HTH,
    John
    *** Please rate all useful posts ***

  • Arp inspection not working on ASA

    Folks,
    I configured a transparent firewall on ASA. I have arp inspection enabled, with dynamic mac learning and dynamic arp. I am able to ping through the transparent firewall using 2 routers with the same mac-address. The firewall shows me that it is learning both the mac-addresses and also forwarding packets, can someone help me understand why this is happening?

    For some reason it will not take the shun command...I've tried every combanation I could think of but it will always fail.. I'm guessing there is a bug or that its just not allowed in transparent mode.. 
    You have to use the vlan before the number or it says invalid host.. when I do specify the vlan 2 it take it and then comes back with "Invalid vlan (2) shun failed

  • Unknown router granted dynamic ARP, now what?

    I have discovered that the Cisco ASA5505 we are using for a firewall is granting a dynamic arp to an SMC router on the outside interface which has access to the internet. The IP address is not that of the single IP granted for the outside interface to the internet, but it is in the range under the net mask (8 addresses).
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    Is the router coming in from the outside?  Has the outside interface been breached?  Apparently the ASA5505 doesn't think the router is violating an access rules.
    The dynamic ARP appeared over the week end, when the normal equipment was shut down, but the firewall left running.  Too bad the ARP table doesn't time stamp when this occurred.
    The unknown router has the same MAC address that was found during the middle of last week.  This appearance just started at the middle of last week.
    I do not know what router this is, so I now have concern.
    What steps should I take to track this down?  (I am not an experienced seasoned security IP person)

    Dear PK:
    I did some reading on my own regarding "Gratuitous ARP" and understand that now, but am having problems discovering how the ASA5505 learned the ARP, since apparently the "show mac" command is not available under the ASA 5505 software (I am using the CLI window)
    The available show commands are "show arp" and "show IP" which is close but doesn't give me what I need.
    It could be that the connection on the other end of my dedicated IP (1 address) is changing or stopping and starting and then sending the Grat arp, as this seems most reasonable, but I would like to confirm that this is so.
    It also doesn't help that last week Columbia University in New York scanned our block of addresses and attempted to sit upon both the http and telnet ports.  Their laboratory is set up to scan banks of IP numbers and find misconfigured routers or security appliances.
    Randall

  • Configuration for connecting 3 wifi routers

    Good Day to all,
    I am  Having problem connecting 3 wifi routers for extensions.
    the 1st 2 routers worked fine.
    the 1st one is connected to the modem using 192.168.1.1 , the second one is connected to the the 1st wifi router configured 192.168.2.1 and worked so fine. the 3rd one is configured 192.168.3.1 but  no luck at all.
    Can somebody help me whats the correct configuration?? or any problem with my configuration??
    Pls Help me.
    Good day and God Bless Us All
    arman from Philippines

    Router 1   192.168.1.1  DHCP enabled
    Router 2   192.168.1.2  DHCP disabled
    Rotuer 3   192.168.1.3  DHCP disabled
    Connect the three via LAN-LAN with a cable
    SSID's can all be the same, different channels... 1,6,11 is best.

  • ARP Inspection on SF-300-24 switch?

    I'm having an issue where two PCs are responding to ARP requests "Who is 192.168.0.1". 
    The real 192.168.0.1 is on port 1 of the switch, and has a MAC address of 00:24:a5:c7:e0:a8.   I can't seem to setup ARP Inspection properly as the rogue device continues to respond.   Can somebody provide the proper steps?  I've enabled DHCP Snooping, enabled ARP Inspection, enabled IP source guard, added FE1 as a trusted interface and all others untrusted, yet this continues to be an issue.  Not sure what I'm doing wrong and can't find any documentation on the web to help out.  I know where the offending piece of hardware is, unfortunately due to its location I can't fix it for several weeks so just looking to bandaid this for the time being.
    Thanks for any help!
    Ryan

    Thanks for your reply.  No, it does not seem to be working as intended.  Please see my screen attachments. 
    I am still getting multiple responses to "WHO HAS 192.168.0.1" from the clients.   Should just be from the trusted host on port 1.
    Any other hints are appreciated. Thank you!

  • Why all packets dropped with %SW_DAI-4-DHCP_SNOOPING_DENY: 1 Invalid ARPs error msg for arp inspected vlans for DMZ and Backup

    Hi,
    We have got cisco 3759 switch where the followign line was configrued only
    ip arp inspection vlan 6,100
    And on those vlans no arp inspection trust was configrued. DMZ and backup servers were connected on that switch. Switch got restarted wihtin 5 minutes for the power outage and when the swithc came online it was denying all the packets coming through the vlan 100 adn 6 althought it was allowing packets before the power outage.
    It took me 30 minutes to find out that arp inspection was enables which might cause the issue, but I am still unsue why it would block all packets for vlan 100 & 6.After taking out the command ' ip arp inspection vlan 6,100' all started working fine.
    What is the reason the switch had this issue? Is there any resolution for this? thanks
    FYI: The error messages-
    0:48:32: %SW_DAI-4-DHCP_SNOOPING_DENY: 1 Invalid ARPs (Req) on Gi1/0/1, vlan 6.([001e.0b5f.3a8c/220.233.31.177/0000.0000.0000/220.233.31.182/14:48:32 AEST Sun Feb 28 1993])
    00:48:33: %SW_DAI-4-DHCP_SNOOPING_DENY: 1 Invalid ARPs (Req) on Gi1/0/3, vlan 6.([000c.2915.1abe/220.233.31.184/0000.0000.0000/220.233.31.177/14:48:32 AEST Sun Feb 28 1993])
    00:48:33: %SW_DAI-4-DHCP_SNOOPING_DENY: 2 Invalid ARPs (Req) on Gi1/0/1, vlan 6.([001e.0b5f.3a8c/220.233.31.177/0000.0000.0000/220.233.31.178/14:48:33 AEST Sun Feb 28 1993])
    00:48:33: %SW_DAI-4-DHCP_SNOOPING_DENY: 1 Invalid ARPs (Req) on Gi1/0/1, vlan 6.([001e.0b5f.3a8c/220.233.31.177/0000.0000.0000/220.233.31.184/14:48:33 AEST Sun Feb 28 1993])
    Regards,
    Arman

    Code version:
    System image file is "flash:c3750-ipservicesk9-mz.122-50.SE3/c3750-ipservicesk9-mz.122-50.SE3.bin"
    I don’t have any etherchannel running from the switch. It is connected to vmware machines which are on DMZ.
    rgds,
    arman

  • My iPad2 always ask password for 2 familiar Wifi routers, 1 at home and 1 in office. How to fix it? Tks.

    My iPad2 always ask password for 2 familiar Wifi routers, 1 at home and 1 in office. How to fix it? Tks.

    Hi, CHAUKTV.  
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    iOS: Troubleshooting Wi-Fi networks and connections
    http://support.apple.com/en-us/TS1398
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