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.
Thanks,
Moh

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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,
Moh

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.

C2950 IOS for DHCP Snooping and DAI

hi all,
anyone knows what image i would need for my 2950 to enable DHCP snooping and DAI features (just for lab purpose)?
or are these features just available on the bigger modular switches (4500 and 6500)?
>sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(22)EA8a, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2006 by cisco Systems, Inc.
Compiled Fri 28-Jul-06 15:16 by weiliu
Image text-base: 0x80010000, data-base: 0x8056A000
Switch(config)#ip dhcp snooping ?
information DHCP Snooping information
vlan DHCP Snooping vlan
<cr>
Switch(config)#ip arp ?
% Unrecognized command

Hi Alain,
Thanks for this info! I've read you're CCNA Security.
Just curious, are you gonna write your CCNP Security soon?
Could you recommend a good lab switch for SECURE?
Sent from Cisco Technical Support iPad App

Can I use DHCP snooping and IOS DHCP server on the same switch stack

Hello,
I am shortly going to be deploying a Cisco CallManager solution for a customer whose network comprises stacks of Catalyst 3850 switches.
There is no separate core/server farm switch so the CallManager servers, voice gateways and IP phones will all plug into the same stack and be in the same VLAN (not my choice!).
For security we want to enable DHCP snooping and were planning on using the IOS DHCP server on the Catalyst switch stack.
Will this work? - when I enable DHCP snooping in networks with separate access layer switches I set the uplinks to the core as trusted links.
I am not sure whether DHCP snooping will work in this case. Do I need to set the VLAN interface on the switch as trusted, is this even possible?
Unfortunately I do not have access to a layer 3 switch to test this at the moment.
Thanks

Nope. That's the issue.
They'll sync on a third device acting as a hotspot, but the device sending a signal is not "on" the network it creates so the airport is all by itself on that network. At least that is what it looks like to me. Anyone have another take on it? Seems pretty silly that an iPad can put out a wifi signal, an Airport Express can receive a wifi signal, and yet there is no simple way to get them to communicate under this particular condition.

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

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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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

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

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

IP DHCP snooping, IP source Guard, and DIA

Hi All,
I have Configured DHCP snooping and IP source guard and Dynamic arp inspection on my 3560 and 3750 Network Switches,
on both of them I'm facing that issue. (the printers and access points are configured to get ip addresses via DHCP), but when the lease time expires, they don't get ip addresses, and become unreacheable.
while all other clients get thier ip addresses normally
below you can find the Configuration configuration
ip dhcp snooping vlan 98,105,111
no ip dhcp snooping information option
ip dhcp snooping database flash:dhcpsnooping
ip dhcp snooping database write-delay 15
ip dhcp snooping
ip arp inspection vlan 98,105,111
ip verify trust on all access ports including printers and access point ports
all access ports are DHCP snooping untrusted
also when I create a static dhcp snooping binding record for these devices on the switch it resolves the Issue, but when I reload the switch it's removed automatically.
any resolution will be much appreciated.
regards,
Maher

check the following link for configuration of DHCP snooping
http://packetlife.net/blog/2010/aug/18/dhcp-snooping-and-dynamic-arp-inspection/
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/snoodhcp.html

Does 3550/3560 support static dhcp snooping binding?

Hi All,
I'm currently studing DHCP snooping.
Just found there is no 'ip dhcp snooping bindg' syntax on 3550/3560, Is there any way to add static dhcp snooping entry?
If there is no way, and the switch intruduced ip arp inspect and ip source guard, and a untrust port connected to an end host with static IP address assigned, in such situation, is it right that I have to add static 'ip arp inspection filter' and ' ip source binding' to makes the end host can send packet out?
Thanks for any comments.
Regards,
Yi

check the following link for configuration of DHCP snooping
http://packetlife.net/blog/2010/aug/18/dhcp-snooping-and-dynamic-arp-inspection/
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/snoodhcp.html

ISE and dhcp snooping

Hi all,
The ISE configuration validator says we should have DHCP snooping enabled on our network access devices (switches) so we do it. However I have never understood what this accomplishes. (In terms of ISE/NAC. I understand what DHCP snooping is).
Can anyone explain? Thanks.

Thanks for the reply, Vattulu.
Interesting article/section, but I don't see where it says anything about the relationship between dhcp snooping and profiling. It seems to be talking about the use of dhcp snooping option 82 to convey the 802.1x user info to the dhcp server. The dhcp server can then act on this information to assign specific IPs to specific users. I can see how ISE would get this information via ip-helper or maybe by snmp bulk query, but don't understand how that would assist with profiling. I mean, ISE already has the 802.1x user identity from the radius request, right? Maybe you can enlighten me.
Googling around I found this article/section:
http://www.cisco.com/c/en/us/td/docs/security/ise/1-1-1/user_guide/ise_user_guide/ise_sw_cnfg.html#wp1059679
which seems to imply that dhcp snooping info can be used when applying DACLs. Interesting, because I thought that was based on the ip device tracking table only. But, it says that dhcp snooping is optional, and doesn't go into any detail.
Still digging, I would like to understand this. Thanks for your help.

DHCP snooping on SUP2 / MSFC2

The question is: is there such thing? The bits and pieces of info I've found kind of contradict each other (some say it's been there since IOS SXE, some say it's not supported at all) - the fact is, we have a 6509 in our network running s222-adventerprisek9_wan-mz.122-18.SXF17a.bin on which "ip dhcp snooping" doesn't seem to be available, either in global or interface config mode...
Thank you.

Hi,
Looking at the configuration for your IOS version.
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SXF/native/configuration/guide/swcg/snoodhcp.html
You need a PFC3 st support ip dhcp snooping
Configuring DHCP Snooping
This chapter describes how to configure Dynamic Host Configuration Protocol (DHCP) snooping on Catalyst 6500 series switches.
Note•The DHCP snooping feature requires PFC3 and Release 12.2(18)SXE and later releases. The PFC2 does not support DHCP snooping.
•For complete syntax and usage information for the commands used in this chapter, refer to the Cisco IOS Master Command List, Release 12.2SX at this URL:
http://www.cisco.com/en/US/docs/ios/mcl/allreleasemcl/all_book.html
Regards,
Alex.
Please rate useful posts.

DHCP snooping setup help

Hi,
Can anyone help me with these setup issues.
The Cat OS config guide chapter "configuring DHCP-snooping and IP source guard" for v8.4 doesnt mention how to:
1) Disable dhcp-snooping
2) configure a destination for the snooping database.
I would like to setup the local flash PCMCIA card as a destination for the DB.
I have found documentation for other releases of CatOS that state how to specify a DB location:
set dhcp-snooping bindings-database <device>:[filename]
However this syntax is not supported in 8.4. With command line auto-complete (the tab key) and/or help there is no option for "bindings-database" available.
Do I need to activate the DB somewhere else in the config?
thanks,

The command to disable DHCP snooping is:disabled the ip dhcp snooping

Sg200-50 support dhcp snooping and dynamic arp inspection?

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