Cisco Switching/Routing :: SG 100-16 Switch - 2 DHCP Addresses

Jan 11, 2012

I currently have a the following configuration and am unable to get more than 2 DHCP addresses for the devices connected to the Cisco new SG 100-16 Switch.The AP have no trouble handing out DHCP to the wireless clients, but we are unable to get the SG 100-16 to be able to do the same thing to wired clients.  It is currently connected to the 2960-8 in port 1.  We can get 2 devices connected without a problem, but the 3rd machine and beyond do not work.  Also, setting up a static IP does not work.  Using a static will not even allow us to ping or tracer back to any devices beyond the SG 100-16.

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Cisco Switching/Routing :: 861 Need DHCP Server With Static IP Addresses

Feb 2, 2013

I used to use a CentOS self-made server for intranet for my little office, but I bouth few days ago a Cisco 861 router to replace the linux box.
1. I have 2 public IP classes from my ISP. 1 class is limitted to 80mbit upload, the other to 30mbit upload. So I need some sort of DNAT to be able to know exactly which intranet computer uses big internet and which one limitted internet.
2. I need DHCP server and with static IP addresses (one computer must always have the same IP address, etc).. i have my needs for this.
3. Also I need external access to some servers inside (web, ftp, etc) [code]
So far so good, all looks simple and I can achieve this in 2 hours on a centos linux box (correct routes, ip forwarding enabled and few iptables rules for NAT/SNAT/DNAT).
But on this brand new Centos router well, i'm not even successful in pinging the outside world, nor the inside world I'm tired of reading the forums, the documentation..i want (at first) a simple scenario: vlan+dhcp, fa4 with 1 public ip address and ACCESS to the real world. I wasn't able to achieve not even that much. [code]

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Cisco Switching/Routing :: 3750 Not Handing Out DHCP Addresses

Nov 2, 2011

Had a problem with a 3750 this morning not handing out DHCP addresses.  The following is a sanitized config of what the switch is using. [code] The IOS installed on the switch is c3750-ipbasek9-mz.122-55.SE1.bin.  What got my attention was that the sh ip dhcp pool PC showed 180 addresses being excluded.  In doing the math from the dhcp excluded addresses, only 64 should be excluded.
My next step was to remove the second dhcp excluded-address line above.  Doing a clear ip dhcp binding * started letting the DHCP service hand out addresses but the sh ip dhcp pool PC stil showed 180 addresses excluded.
It finally took removing the dhcp pool and putting it back in to drop the number of excluded addresses down to a value that matches the first excluded-address line.  Didnt see a dhcp bug in the bug database that would explain this.
I tried re-entering the second excluded-address line from above and saw the number of excluded addresses rise as expected.  When I negated the line, the number of excluded addresses dropped back to its previous value.

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Cisco Switching/Routing :: 881w-gn-a-k9 Access Point Not Serving DHCP Addresses

Jan 27, 2013

i have to Bridge the AP to VLAN1 which has the DHCP pool. For some reason when I try to do this from iOS console it tells me that gig0 is not a bridgable interface. I am newb to Cisco iOS (24 hours new ). I got the Cisco Configuration Professional working and would like to fix my issue through there if possible? why my AP wont get anything but APIPA addresses?

version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption


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Cisco Switching/Routing :: 3750 DHCP Server Handing Out IP Addresses To Client Connected To VLAN5 Interface

Feb 23, 2012

Haveing issue with DHCP server handing out IP addresses to client connected to VLAN5 interface.ISP Router>Firewall -(WatchGuard Drop-in mode) I have several 3750 switches and  one acting as a L3 switch. The L3 is configured as follow: [code]
If I connect a laptop to int fa1/0/10 I DO NOT get an IP address from the scope. If I connect to another interface within the VLAN 1, I get an address from the range.

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Cisco Switching/Routing :: Restricting Mac Addresses On 4506 Switch

May 14, 2013

We want to permit certain mac addresses on the cat 4506 switch wherein only those mac addresses will get access to network.
Configuration Planned: For testing purpose we have created mac access list on cat 4506 and deny laptop mac address in this access list. The mac access group is applied to the port where the laptop is connected to cat 4506.Even after applying the mac access group on the port, the laptop is able to ping the vlan ip of cat 4506 [code]
laptop with ip address connected to port 2/1 is able to ping even after applying the mac access-group
Note-we have tested same configuration on cat 3560 and its working fine. We apply the mac access-group command on interface and clear the arp-cache and we are not able to ping vlan interface ip. The moment we remove the mac access-group,ping starts again.

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Cisco WAN :: Setup 3550 Layer 3 Switch To Do Hand Out Dhcp Addresses For Different Vlans?

Dec 26, 2012

I am trying to setup my 3550 layer 3 switch to do hand out dhcp addresses for different vlans.  It is connected to my router address  I setup a new vlan 3 and the dhcp pool.. The client gets a address but am not able to ping the router and other clients and get out to the internet. 

Here is the config that I have.  I deleted the other ports because I am not using them.  The vlan 3 client is on port fast Ethernet 0/17 and the router is connected to the fastethernet 0/1. 

version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption


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Cisco Switching/Routing :: How To Configure Dns / Dhcp In Switch 3860

Mar 18, 2010

am having a switch 3860 it is configured dhcp , dns  i want to change those dhcp , dns, what are the command that is use to reconfigure it

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Cisco Switching/Routing :: 3560X Configure DHCP On Switch

Apr 29, 2012

I have Cisco 3560X L3 switch and i need to configure DHCP on this switch. I have already configured below mentioned VLANs
After configuring DHCP, all the users needs to get IP from USER VLAN and all the servers should get IP from SERVER VLAN. If yes, what are the steps as I am very new in this kind of configuration.

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Cisco Switching/Routing :: DHCP Configuration For 2960 Switch?

Oct 21, 2011

I did the DHCP configuration for my CISCO 2960 switch but the clients are still not able to get the IPs.see the configuration below.
(config)#ip dhcp database
(config)#pool test
(config-if)#client client-id vlan 500
(config-if)#ip dhcp snooping trust

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Cisco Switching/Routing :: 3560 DHCP In Layer 3 Switch

May 25, 2012

I have made a topology by using one 3560 switch and 2 2950 switches. I have also made 2 vlans name Clients and other Servers and vlan 1 is for anagement purposes. The left 2950 switch is for clients and the right is for servers. Clients is vlan 2 and servers is vlan3 . Now what i want is that my dhcp is should assign ips to clients in vlans 2 provided that servers are in vlan 3. I am also using a border router and i have introduced a default route on the 3560 to the border router.
Now when i assign static ips to my clients pc and server dhcp then i can ping between vlans but when i try to assign ip through dhcp then it wont work. Also the default route on the switch to the border router doesnt seem to work. I can ping only the border router when i put a default route on the border router instead of the 3560 switch.

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Cisco Switching/Routing :: 3560 DHCP Between Switch And Router

Jul 23, 2012

I have a cisco 3560 24PS and its connected to two ADSL broard band is a personal broadband line using a Billion ADSL broadband router, and the other is a business broardband line using BT's 2wire broadband line.on the Billion routers i have various things attached like a NAS and a printers, both wired connections. then i have laptops and phones that connect over wifi, so its configured to act as a DHCP server
the only thing conncted to my 2wire router is my company's laptop (wired or wifi depending on where i'm working from), so again i have it working as a dhcp server.The switch is configured with multiple vlans, with dhcp scopes assigned for each vlan.I have a static route pointing all traffic to my Billion ADSL for internet connectivity.
The problem i'm having is that when i turn on the cisco switch, all wifi conected devices loose their conection. only 2 things get it working again, a reboot of the router, or disabling then enabling the DHCP service on the router.upon further analysis i was able to find out that the devices were not able to pick up an address from the router. again i looked deeper into this and i can see the following on logs of my router: [code]
so it seems that the router tuns off its DHCP capabilities because it detects that my Cisco switch is running DHCP services. I need to figure out how to keep the billion routers DHCP running when ever the switch is turned there a way of filtering out any DHCP chat from the switch to the router?

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Cisco Switching/Routing :: 3560 Switch Responsible For Not Passing DHCP To AP

Jan 16, 2013

I have two WAP4410N plugged into my Catylist 3560 switches.One of these switches is my Default Gateway for the LAN.The only way I can get a device to connect to the WAP4410N is by assigning it a static IP.  Then it works perfectly.

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Cisco Switching/Routing :: 3750x Binding Between A Switch Interface And DHCP

Nov 8, 2011

I am looking for a way to bind between a switch interface (cat 3750X) and a DHCP server reply.The switch can operate as the DHCP server .a PC connected to interface Gi 1/0/1 will lways get IP address because it is connected to interface Gi 1/0/1, a PC connected to interface Gi 1/0/5 will lways get IP address because it is connected to interface Gi 1/0/5 and so on... (no matter the source MAC address who sends the DHCP request).

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Cisco Switching/Routing :: Unable To Use DHCP In 2960 And Unmanageable Switch?

Nov 1, 2012

I am having 2960 switch and one port is configured with a VLAN and connected with an unmanageable switch and further one more unmanageable switch was connected to the primary unmanageable switch…

The topology will be    2960 switch -> unmanageable Switch -> unmanageable -> PC connected
The issue I am facing most of the PC are getting IP addresses through DHCP server and very few 5 or 6 PC’s out are not getting the IP from DHCP server.If I switch of the switch and switch on the issue is resolved for those and it will raise for some other PC’s.

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Cisco Switching/Routing :: Enable Dhcp Service On 3560 Switch

Mar 19, 2012

can you enable dhcp service on a 3560 switch.

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Cisco Switching/Routing :: Catalyst 3560-X Switch To Act As DHCP Server

Apr 26, 2012

I'm attempting to configure a Catalyst 3560-X Switch to act as a DHCP Server. There is documentation that supports this feature. Below is my config procedure however after the completed procedue no IPs are handed out to clients. [code]

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Cisco Switching/Routing :: DHCP Server Will Work On 2950 / 2960 Switch

Feb 11, 2012

With out using any server, will DHCP be configured in cisco 2950/2960 switch?I man cisco it self should work as a dhcp server also.

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Cisco Switching/Routing :: Does 2600 Series Switch Support 802.1x And DHCP Snooping

Feb 14, 2012

does Cisco 2600 series switch support 802.1x and DHCP snooping?

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Cisco Switching/Routing :: Catalyst 2960 / Configure Automatically Switch Over DHCP?

Jun 12, 2013

I Have a problem I'm trying to configure automatically my switch over ther DHCP when I start the switch it request an IP from the DHCP from here everythings is fine but it does nothing more,indeed I put on my dhcp the option 66 and 67 which is an adress of my TFTP server and a file to download and the switch seems not to understand theses options , I tried my dhcp with a cisco airport and everythings works fine the File from the TFTP is automatically downloaded into the airport...There is an option to add or am I missing something in order to make it work with my switch ?
My switch : Catalyst 2960IOS VER : 12.2(55)SE5

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Cisco Switching/Routing :: Configure 2960 8 Port Switch With DHCP Server?

Jun 24, 2012

I need to configure a Cisco 2960 switch as a DHCP server.    The current IP address will be on a different seed than the DHCP addresses.  i.e.
Switch IP =, GW =, Subnet =
DHCP addresses would be - 200, GW=???? ( and subnet would be

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Cisco Switching/Routing :: 3560 / Administrative Control On L3 Switch For DHCP Service

Sep 25, 2012

My Network Layout is as,  Firewall (with Routing)------>Cisco 3560 Switch (L3)------> connected 8 Cisco 2960 switch (L2)----> all users I have configured 20 VLAN's on cisco 3560 switch with Dynamic Pool and Static, Means, 5 Vlan's are Dynamic and remaining are Static Our Company process provides only internet access to existing clients computers. Problem is that, I configured Static VLAN 5 for one of our Client in their seperate room, mean to say, i activated all ports of their room with Static VLAN 5. one day they configured own DHCP server on Windows 2003 Server with same subnet (Same as VLAN5) in their room without any information and now their all computer/ Laptop acquiring ip address Dynamically.
If i have configured Static vlan on that port's then how it is get Dynamic ip from same port's.How to restrict to permit another DHCP server/Service in our premises. I Do not want to give administrative control to Clients to do such kind of thing with LAN.

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Cisco Switching/Routing :: Router Is Connected To Switch 2960 Configured As DHCP SNOOPING

Sep 3, 2012

We have a DHCP SERVER implemented in a cisco router 2610.This router is connected to a switch cisco 2960 configured as DHCP SNOOPING. At the switch appear the next log message: [code] The ip address: belongs to DHCP SERVER configured at router cisco 2610. What to do so these log messages does not appear any more? Do I need to do some configuration changes at some switch or router?

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Cisco Switching/Routing :: Can Layer 2 2950 Switch Be Used As DHCP Server With Its Own Address Pool

Mar 18, 2009

Can a layer 2 cisco 2950 switch be used as a dhcp server with it's own address pool.

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Cisco Switching/Routing :: Catalyst 3560X-24T-S - Setup DHCP Servers On Layer 3 Switch?

Apr 1, 2012

Do you have the ability to setup DHCP servers on this layer 3 switch? I know I can with my old 3550 switch. Want to upgrade and make sure this model supports setting up dhcp servers on it.

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Cisco Switching/Routing :: DHCP Client And Http Secure-server Config In C2950 Switch

May 7, 2013

I am trying to configure interface vlan1 to get an ip address from dhcp by entering the commnad ip address dhcp ios rejects the dhcp portion of my command as not recognised although it is referred to in Cisco IOS version is c2950-i6k2l2q4-mz.121-22.EA14.bin.I get the same problem when I try to configure ip http secure-server on the switch. Is this a known bug or whether I have the correct IOS version for these commands?

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Cisco Switching/Routing :: 6509 - Configure Multiple Dhcp Pools On Switch For Multiple VLANs

Mar 9, 2010

Is it possible to have multiple dhcp pools for multiple VLANs? The switch is a 6509 and/or 4506 catalyst. I don't want to use server-based products.

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Cisco Switching/Routing :: 2921MS DHCP NACK With DHCP Relay?

Nov 11, 2012

I have some DHCP trouble since I subnetted my network with a 2921. My clinets are in and DHCP servers are in, randomly I guess, I get NACK from my DHCP server, and if I look into DHCP logs I got something like this:


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Cisco Switching/Routing :: 3550 / 2950 DHCP Relay Option To Router Handing Out DHCP

Apr 3, 2012

Have a client wanting to hand out public ip addresses to all clients from a PFSense Firewall terminating the internet connection.
How do I allow the Cisco Switches currently in place, configured with private ip addresses in the 10.10.x.x ranges and Vlans, where the main 3550 layer 3 has defined dhcp scopes for each vlan, to relay dhcp requests from all vlans to the PFSense firewall?
I assume I would take off the currently defined dhcp scopes for the vlans and configure each vlan/switch with the ip helper address and specify the PFSense firewall and that Nat would have to be disabled onthe firewall?

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Cisco :: 2106 - APs Not Getting DHCP Addresses?

May 25, 2011

I've just installed a 2106 Controller at a remote site. The Controller is seen by the WCS at the main site so, connectivity is good and I'm able to login from the main site. I've configured the DHCP server which is at the Main site on the AP manager interface and the Manager interface and on the WLAN of the new controller but, APs are not getting addresses.

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Cisco Switching/Routing :: 3750 Not Handing Out IP Addresses

Jan 10, 2013

We have a 3750 running IOS ver 12.2 (44) SE, it has performed great and we have never had a problem with it. However we have noticed that when we had an outage some of our Wireless APs didn't come up as they get DHCP from the 3750. The DHCP scope said IP was depleted although there were IPs to give. We had to delete and recreate the DHCP Pool. However two days later we got the same problem and then had to do the same thing over again.

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Cisco Switching/Routing :: 3750 - How To Hide Mac Addresses

Jun 12, 2013

I Lease fiber between two locations, My operator limiting number of MAC addresses to 8 macs. Is there any possibility using some feature available in the Cisco 3750 switches to (hide mac addresses) encapsulate traffic witch flowing via operator network ?
I need to send data between locations with 1Gb/s speed. If 3750 switches can't do that, which models of switches 1 or 2U can do it. May Metro switches ?

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Cisco Switching/Routing :: 3750 - Two Different MAC Addresses On Same Switchport

Feb 16, 2012

I have Catalyst 3750 running IOS version c3750-ipservicesk9-mz.122-55.SE.bin.  I have an access port that connects to a Redhat Linux version 5.4 64 bits machine.  When I perform a "show mac address-table interface g1/0/3" where the redhat machine is connected to, I see two mac addresses on this access port.  One of the mac addresses, 0025.9006.4898,  belongs the the redhat machine.  the other mac address, I have no idea where it comes from.  I tried to perform clear mac address-table dynamic g1/0/3 several times but it does not work either.

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