Cisco Switching/Routing :: 120 IP Address From Incorrect Scope Is Assigned From DHCP
Jul 8, 2012
I am trying to setup VLANs and most of configurations are working ok now except IP address assignment from DHCP. If any computer in VLAN 120 or 130 configured with manual IP address, then all works fine. It can reach internal servers and the internet without problem.If the IP address is assigned automatically then any computer in VLAN 120 or 130 are obtaining IP address (strangely!) from VLAN 100. Because switch ports that connected to the computer belongs to VLAN 120 or 130, the computer cannot reach internal servers and the internet with ip address from VLAN 100 . All SVI interfaces for VLAN 100, 120 and 130 have ip helper-address option defined pointing to the DHCP server. No DHCP snooping enabled on all switches at this point. DHCP server have three scopes for the three different VLANs.
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Apr 2, 2012
The company I work for owns a remote manufacturing facility that houses a stack of five 3750 switches that function as the core switching system for the plant. DHCP services are configured on the 3750 stack.
There are currently three VLANs configured, one for data and one for voice (144 and 244 respectively) and one for UCM servers (200), with corresponding subnets of 10.44.32.0 /19, 10.44.0.0 /19 and 10.44.100.0 /24.
The current DHCP scope configurations are as follows:
ip dhcp pool Plant-44_DHCP
network 10.44.32.0 255.255.224.0
default-router 10.44.33.254
[Code].....
My question is will the addition of this scope in the manner presented cause any problems with PCs or IP phones outside the targeted recepents receiving the wrong IP information from this scope?
I plan to identify the users that should be members of this VLAN 444 and change the switchport mode access configuration on the corresponding switch ports from VLAN 144 to VLAN 444. The voice VLAN 244 will remain the same.
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Jul 1, 2012
I am using Windows 2011 SBS and Windows 7 clients.My server has a DHCP range of 192.x.x.150 to 192.x.x.199 and all other I.P. addresses are static. On a workstation located at I.P. 192.x.x.13 I am seeing an address conflict.When I perform an "nbtstat -a 192.x.x.13" command from the server I am given the logical computer name of a staff members personal laptop.Investigation of the laptop reveals that it is set to DHCP, and clearly the address of 192.x.x.13 is outside of my servers DHCP scope, so this I.P.should never be assigned, let alone in duplicate.I Google this topic before posting, and it was suggested that IPv6 could be having an adverse affect. I determined this because I performed a ping on the laptop and only got a MAC address back rather than an I.P. address.However after unticking IPv6, and rebooting, the laptop is still causing havoc.I can set a static I.P. address on the laptop, however this is not ideal.
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Apr 7, 2013
DHCP scope is configured on a WLC 5508.I'm checking if there' a way for WLC to clear the dhcp leasing when a user is diconnected from wireless?
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Jul 11, 2011
My Network is running Windows Server 2003 and with more than 150 Users. But last week, I notice that a program is changing my DHCP server IP Address scope.
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Oct 8, 2012
We have a Cisco Aironet 1242 AG Series which we are trying to setup. The DHCP assigns the IP address, but we cannot connect to it. We have had this problem with a previous Aironet unit, which this new one we have got now is also having the same problem!Everything seems to be correct, but we cannot get to the IP address to set it up.
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Apr 12, 2012
Is there any way to get an ip address through it's physical location? I was asked this by a friend and it's a good question. We know how to get the physical address by it's by coordinates, but is it possible to reverse it, getting the ip assigned to the physical address?
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Mar 30, 2011
How can I change my external IP address which is assigned
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May 21, 2012
I've created a tonne of dhcp scopes on my routers before never had any issues, however this one will not hand out any addresses at all, i even give the router a reload to see if any magic happened but nothing, ive ended having to put a temp server in with just dhcp installed until i get the router diong what it should my config below, its something simple i havent seen, as ive compared it to plenty of my working DHCP configs and seen nothing.
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Feb 22, 2013
I have a ASA5505 that i have running asdm 6.4 on it and have tried setting up some DHCP scopes for the interfaces.I have the security plus key.I set up 4 interfaces all with different subnets and all with different DHCP being doled out by the firewall for the time being.Anyway, 3 of the 4 work.I have tried to change interfaces wondering if there was an issue with that phy device.I tried enableing the subnet that would not work first and it didnt matter still would not issue dhcp.the other 3 work fine.Is there a limitation to the amount of scopes that will issue dhcp for an asa5505 ?
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Feb 6, 2013
i am using wlc 4402 with a mgt ip 172.26.150.x/24 and ap manager ip 172.26.150.x/24, my all ap get the ip address from dhcp . currently in dhcp server 172.26.150.3 to 254 dhcp scope is configured. at mysite some devices are configured like ipad,iphone or galaxy tab with mac binding in dhcp server. now this pool is almost full. i have a policy configured for these devices for mac binding is done in DHCP. to increase pool what are the changes i need to do in wlc. what are the changes i need to do in dhcp server . is policy made for mac binding in dhcp server will get affected by this ?
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Aug 10, 2011
I disconnected and reconnected the powercable while holding on to the setup button until system, alert, setup go amber. The system led light began blinking green. I waited until one of the leds lights on the ports starts blinking green I then connected the ethernet cable connected to my pc. I made sure my lan connection on my computer was set to dhcp.In the docs claim it should take about 1 minute to grab a new ip address. After a few minutes i check the ipconfig on my pc and I get the apipa address.The setup light on the switch remains green while system is amber. The led for port 1 stopped blinking and remains green.My pc is not grabbing an ip address I don't know what else to do.
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Oct 3, 2012
I change DHCP scope to match corporate IP scheme Friday came back To discover only some stations picked up new leases from the scope.
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Aug 10, 2011
I have a 5508 WLC controller at the HQ with the employee ssid ,the dhcp scope on the ssid is 10.120.0.0/16 network.
However,I want this same ssid to be brodcasted to a remote site using HREAP access point but with different dhcp scope 10.102.0.0/16.
I have tried creating another interface for the remote site with a different dhcp scope(10.102.0.0) but the controller wont allow me create another wlan with same ssid that existed before to apply the new interface created for.
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Feb 16, 2012
I did the config below but unable to obtain the ip from the subnet scope 10.10.9.0. The switch is in the layer 3 mode.
no spanning-tree
vlan database
vlan 2
exit
voice vlan oui-table add 0001e3 Siemens_AG_phone________
voice vlan oui-table add 00036b Cisco_phone_____________
voice vlan oui-table add 00096e Avaya___________________
[code]....
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Sep 11, 2011
The 5508 is running code 7.0.116.0. I have created a group interface for 3 subnets and assigned the group to the WLAN. Clients are getting IP addresses in a round robin fashion. The issue or downside to this is if the lease has not expired before the next time the station connects to the WLAN it consumes an address on another subnet instead of grabbing the unexpired lease IP address on it's previous VLAN. It seems that the WLC determines the VLAN in the interface group before the DHCP request from the client in case the client already received a DHCP address that has not expired. This can be problematic since we have seen some iPhones requesting an address every 20 minutes thus consuming an address on every subnet in the interface group. Other than setting a lease time extremely low what can be done to address this?
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Nov 13, 2012
Not sure if this is a problem with the switch or the wireless AP connected to the switch, but I have a couple of 3560's, one is a 3560G and the other is a 3560, both have phones and wireless ap's connected to them. The ap's on both of these switches continue to loose there ip address and thus disconnect from the controller. This happens about once a week, but the odd thing is that the phones never loose there ip address. All of my other 3560s and 3560g's that have AP's and phones connected are working fine.
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Nov 19, 2011
I'm trying to configure my C3550 with fast ethernet port 0/48 assigned to vlan 2 in static access mode and SVI vlan 2 configured as dhcp client.
But I see command ip address dhcp is not available on interface vlan 2:
Cat3550(config-if)#ip ad
Cat3550(config-if)#ip address ?
A.B.C.D IP address
Cat3550(config-if)#ip address
Could it be a problem related to the version running on the equipment (see below the output of sh version command not sure of what EA1 stands for)? I read here [URL] that this command was introduced in version 12.1(2)T
If it is a version problem is there any possibility to download upgraded version for free?
Cat3550>sh ve
Cisco Internetwork Operating System Software
IOS (tm) C3550 Software (C3550-I5Q3L2-M), Version 12.1(20)EA1, RELEASE
[Code].....
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Nov 20, 2011
The DHCP/DNS server is on ip address 10.1.100.103 with an alt on .102 I'm attempting to integrate a 4510R+E into an existing network and use existing DHCP/DNS windows 2008 server to push out IP addresses to connected computers.
I want to assign a VLAN to every port for management purposes and then I put an IP helper address on every VLAN.
I've attached a the 4500E partial config. I'm attempting to get Gi1/44 to a state where I can plug a computer into it an resolve an ip address and gain internet access like all the devices on the existing network can do.
I've created a new scope in DHCP with the ip subnet of 10.60.211.0 255.255.255.0 It leases addresses from .1 to .253
The computer will not resolve ip addresses with this config.
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Apr 29, 2012
we have a 3560 switch configured with EIGRP with dhcp. We have a user that we cannot ping, however the interface show up / up and no errors on interface. the ip address is 10.2.0.199 - however we have dhcp configured to exclude the range from dhcp ip dhcp excluded-address 10.22.0.1 10.22.0.200 how can this work station get a dhcp address if we have that ip range excluded from the dhcp pool?
The user is off a different switch that is a uplink to this distribution switch. Traceroutes shows that the problem is with the distribution switch.
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Dec 11, 2012
a new LAN installation, two VSS pair 6509 core, 15 closets, with 3750 stacks. Floor 15 only, devices/hosts can ping teh DHCP server but cannot aquire IP addresses. no such problem on other floors?
portfast an dother parameters are intact.
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Jan 30, 2011
I have a 3911 router with a 1242 AP. The problem that I have is that when the user is trying to connect, the user get the OS Ip address 169.254.168.154 and I see that when I do the "show dot11 association" command, but when I do sh ip dhcp binding on the router I see
172.19.9.141 0100.18de.74db.14 Jan 31 2011 11:14 AM Automatic
The router is seeing as if the router gave the ip address to the user, but the reality the user was assigne the OS ip address 169. I did "debug ip dhcp server events" and I got the following:
Jan 31 11:09:06.752 EST: DHCPD: Seeing if there is an internally specified pool class:Jan 31 11:09:06.756 EST: DHCPD: htype 1 chaddr 0100.18de.74db.14
Jan 31 11:09:06.756 EST: DHCPD: remote id 020a00000a58218400000000Jan 31
[Code].....
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Jun 8, 2013
We have 2 nexus 7010 switches configured with HSRP in the network. For all the vlans core1 is Master and Core2 is standby. In the current setup we have external dhcp server and dhcp relay is configured for all the vlans on Master and standby switch. The setup is running the IOS 5.2
Activity Done: During the Maintainacne activity, we isolated core1 switch in the network by disabling the vpc/keepalive and all the uplinks from access switch. The core2 switch was master for all the vlans.
Issue observed: It has been observed that new users were not getting ip address from the dhcp server. The ethereal capture showed that dhcp server was not getting the dhcp requests from the core2 switch. We disabled the dhcp feature in core2 and enabled again with dhcp relay again configured on vlan interfaces .even after doing this no change was observed in behaviour. Finally we got core1 back in network by enabling all the links.
Observation: The moment VPC link came up between the core switches, users started getting ip's from dhcp. Then we started enabling all the uplinks on core1.Core1 again become master for all the vlans and users continued getting ip’s. Network running fine.
Further Testing
1. For one of the vlan, core 2 switch has been made primary and for new users checked the dhcp functionality and it was working fine. The aim was to identify if anything wrong on core 2 related to dhcp relay
2.Again we changed the priority for this vlan and made core1 master for the same. This time we disabled this vlan on core1 and tried new user with core 2 became master and dhcp functionality worked fine for new user. Actually in this case we have simulated the same behaviour when we observed the issue with only difference of VPC was not available during the issue time as core 1 was isolated form network
Inputs needed.
Is there any known behaviour for dhcp functionality when VPC is unavailable? If we see the test scenario2 (wherein core1 was master for the vlan and we disable this vlan on core 1 and core 2 was able to relay dhcp requests for new users in this vlan.) it was actually same as scenario we observed during issue time..
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Feb 22, 2013
Version 12.2(33)SXI
int vlan 1
description client vlan
ip vrf forwarding A
ip address 10.1.1.1 255.255.255.0
standby 129 ip 10.1.1.2
standby 129 timers 1 4
standby 129 priority 105
standby 129 preempt
ip helper-address 10.1.2.20
[code]....
dhcp requests are not making it to the dhcp server SAME VRF (ip helper-addres is not doing anything.....)extended vrf traceroutes on udp 67 sourced from vlan2 are fine
I am expecting udp unicast packets on port 67 "giaddr" relay packets on the DHCP server generated and sourced by the relay on Vlan1
eg. Mar 1 01:59:06.731: DHCPD: setting giaddr to 10.1.1.1
This exact setup works in our preprod environment with the same code.Only difference is we run Distributed etherchannel on the 6500's where this doesnt work.
Wireshark on the client I can see the requests being sent Going to check it with debug ip dhcp server to check the relay logs out of production hours.
I have seen so many people say it IS and ISN'T supported on this version of the code.e.g. [URL]
I am aware the helper-adddress should inherit the vrf of the interface ip helper-address vrf command is not supported.The fact it works in the PP environment.... could this be due to the Distributed EtherChanel difference? or just some bug....
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Aug 30, 2012
I am administering a Catalyst 2960S switch and I would like to connect several computers to it. Some of those each have a static IP address. For a few of them, I would like the switch to dynamically assign an IP address to them via DHCP. Is the switch capable of doing this? If so, how can I do it? I tried looking through Cisco Network Assistant and I couldn't find it. Some web pages have suggested I telnet into the switch and issue commands like "ip dhcp ?" to see what commands are possible. I can telnet in and if I type but I get an "Unrecognized command" for both "ip ?" and "ip dhcp ?". This makes me think I'm reading the wrong web pages. I did come across the term "DHCP snooping". It seems relevant, but very difficult for me to grasp.
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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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Nov 15, 2012
Does the 2960 switches with LAN-Lite support DHCP Server Port-Based Address Allocation?
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Aug 23, 2009
I recently switched routers to the DIR-615 and I'm trying to troubleshoot why one of our laptops keeps losing the IP address and gets a self-assigned IP address. I see the following messages in the log, I am wondering if the reason codes are listed and explained somewhere? I tried searching the manual but could not find any information.
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Jan 15, 2013
Just inserted a new 5508 WLC into the network. We current have 3 4404 WLCs, and there was a need to duplicate, as much as possible, the configurations on the 4404s, and the design. The 5508 came online as expected. We moved a few access points over to it. The APs got the correct address range. The clients are expected to get addresses in the same scope range as the APs. However, the clients are receiving addresses in the management IP scope.I know there are two "not a good way to do it" in here. Why is the management address range in the DHCP scope, and why are the clients using the same scope as the APs. We are going to change that. For now, the AP and client in the same range has been going on since we rolled out wireless in 2006.The 8 ports on the 5508 are configured for LAG. There is no dedicated port for management. They tell me not to do that on a 5508.
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Jan 5, 2012
My actual Scenario
1 x 4500 and 1 x 3560?They are gateways of 8 Vlans?They are doing HSRP in each of those Vlans?The 4500 is the Active?There is a DHCP Pool for each of those Vlans on both gateways using "ip dhcp excluded-address" I ensured that the range of provided ips by each DHCP server will not be overlapped Obs.: Reducing the lease time, I ended with the calls bringing related problems.
OK, every thing is blue, every thing is fine.But the network diagram is realy complex(41 switchs, 89 uplinks), and depending of how is the network flow, one or other server answer first or latter.
For many reasons I would like that the secondary DHCP server would answer only if the primary DHCP server goes down.To me, the bigger reason is that DHCP database would be only in one DHCP server.But there is other reasons.
I passed by many frustrated solutions:Try to force a delay on the answer on one of the servers. - Impossible.Try to disable DHCP server, and, using EEM, enable it only if router became active in HSRP. - I couldn't do It.
What I'm thinking now is use the HSRP resource to resolve it.On both routers I would put a "ip helper-address" pointing to an Virtual_HSRP_IP.And depending on which router is the active, him will answer the request.
My first doubt is:Would it work?The second doubt is:Could I use the same Virtual_HSRP_IP that exists on that Vlan(see example 1),or I would need to point it to a Virtual_HSRP_IP in a different Vlan(see example 2)?
Example 1
-----------------------------------
| 4500 |
-----------------------------------
interface Vlan1
ip address 10.10.0.2 255.255.0.0
ip helper-address 10.10.0.1
standby 1 ip 10.10.0.1
[code]....
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May 13, 2012
Initially there were 3 SSIDs configured but all of them were assigned a single interface and this interface was configured with the controller management IP address as DHCP server so that the WLC could assign IP addresses to wireless clients, guns and printers etc.
Issue: As part of PCI initiative, we decided to segment the traffic in multiple subnets based on type of wireless clients; so now there are 3 interfaces configured and each SSID is assigned a specific dynamic interface and each interface is configured to use the controller management IP address as DHCP server.
There are 3 scopes configured for each of the dynamic interfaces/SSIDs and DHCP proxy is enabled but wirelss clients are still being allocated IP addresses from the original DHCP scope that was associated with the dynamic interface originally assigned to all 3 SSIDs.
I verified the following:
1. Each SSID is assigned a different dynamic interface (Users, Voice and Handhelds)
2. Each dynamic interface is configured to use controllers management IP address as DHCP server
3. DHCP scopes configured with correct network information for each dynamic interface and enabled
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Jun 26, 2011
I have an ASA 5505 with software version 8.2(1). It is making DHCP requests for IPSec clients that connect to the ASA. The DHCP requests packets the ASA makes have an extra '00' appended to the hostname field, and the length field is the size of the hostname + 1. The DHCP server is Microsoft Server 2003 and this causes the hostname to be registered with an unknown character which appears as []hostname. Then when server 2003 tries to update the DNS record, it fails because of the invalid character in the hostname. Is there anyway to have the ASA have the correct length for the hostname field in the DHCP packet, or a workaround that will solve this problem?
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Dec 27, 2011
I've been using this setting for clients in small offices and what not, and since all they wanted was to give another nutch of security to their network, we've been intalling cisco routers 2600 series still outhere for their internet connections and we had no issues what so ever, not until we run into cable isp provider, and their dhcp wont be able to assign our interface a dynamic IP, this is the setting aplied to the router interface;
interface fastethernet0/0
ip address dhcp
ip nat outside
no ip redirects
no ip unreachables
no ip proxy-arp
Why it wont be seen or assigned an ip by their dhcp, I talked to their isp and they assigned a static ip (private one) and we still have the same issue, if i connect a pix 506e interface with the ip add dhcp assigned to it gets a dynamic ip right away...
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