Cisco Switching/Routing :: 891 Router DHCP Server Reservations Being Overridden?
Dec 11, 2012
I am running into a DHCP problem on a Cisco 891 running 15.0(1)M2. I am running DHCP on the router and want to reserve an address for a printer. I have done this hundreds of times on hundreds of routers. Per Cisco recommendation, I let the printer lease an address to see whether it uses it's "hardware-address" or "client-id". This printer uses the "hardware-address" format. The printer has leased 10.0.0.102 right off the bat. I want it at 10.0.0.50.
I have a DHCP pool, like this:
ip dhcp pool CLIENT
network 10.0.0.0 255.255.255.0
domain-name chsinc.ds
default-router 10.0.0.1
dns-server 10.0.0.1
lease 2
I create a "reservation" like so:
ip dhcp pool HP_LaserJet_Printer
host 10.0.0.50 255.255.255.0
hardware abcd.ef12.3456
Now I do a "show running-config" to see what I've put in and it looks just like above. Now we reset the network settings or change any network setting on the printer to force it to renew it's lease. What should happen and what usually happens is that the printer should request an IP, be offered 10.0.0.50, accept that IP and come up on that IP address. What is happening with this particular printer is that the printer requests a specific IP (the same IP that it had initially = 10.0.0.102), the router says OK and does not enforce the reservation. Then the router actually deletes the hardware-address config line right out of the running config. A "show running-config" shows that the reservation config now looks like this:
ip dhcp pool HP_LaserJet_Printer
host 10.0.0.50 255.255.255.0
See the logs below. Notice the ones in bold.
000226: Dec 12 17:34:01.382: DHCPD: Seeing if there is an internally specified pool class:
000227: Dec 12 17:34:01.382: DHCPD: htype 1 chaddr 101f.74b0.575c
000228: Dec 12 17:34:01.382: DHCPD: remote id 020a00000ae1e10100000001
000229: Dec 12 17:34:01.382: DHCPD: circuit id 00000000
[code]....
Is there a way to make the router enforce the reservation and not let clients just bring their own IP and actually make changes to the running-config of the router?
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Feb 8, 2012
I'm setting up a new E1200 and I'm searching for the area for DHCP reservations. My D-Link DIR-615 offers this ability in the Admin panel. This is quite useful since it allows for easier port forwarding management to specific Machine IPs without having to assign static IPs for each machine. I can't seem to find any documentation on this feature no the site or in the forum that applies to the E1200. If it's not offered, boy did I make a mistake in getting the E1200. I should have bought another DIR-615.
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Nov 13, 2012
I have a EA2700 and will try to reserve an IP address to a PC, but getting up that address is invalid.I already have two reservations, which is 192.168.10.10 and .... 50, I try to reserve ...... 20 but am getting alert that this then is "Invaldi IP".
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Jul 9, 2012
Is it possible to configure an 881 router to act as a DHCP server to 4 VLAN's each with a different scopes all through a single ethernet interface?
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May 2, 2012
i'm interested if it's possible to set the NTP server via DHCP on an 2901 Router with 15.2(2) image.
i configured the interface gigabit 0/0 as dhcp client. The DHCP Server sends to me DNS, Default GW and NTP. All is working fine, but the NTP will not be configured. i tried to add an DHCP option request, but there is no NTP (42) value. [code]
is there any way to add the value NTP (42) for the DHCP request or isnt it possible?
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Sep 7, 2012
I have an EA2700 running latest firmware 1.1.38.138827. It is using Cisco Connect Cloud. I am unable to access the DHCP Reservations link under Connectivity/ Local Network. When I click on it, nothing happens. I've tried multiple browsers including IE 10 (Windows 8 RTM), Firefox 15, and Chrome 21. I also tried on a Windows 7 machine with IE 9 and the link doesn't work on that either except that it shows a box that says Invalid Character when I click on the DHCP Reservations link. I see no invalid characters on the screen. Any workaround other than downgrading the firmware or assigning static IPs on individual PCs?Also, on an unrelated note, where is the Dynanic DNS configuration on the Cisco Connect Cloud?
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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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Nov 15, 2012
how to setup DHCP reservations I found that the ASA 8.x was unable to do it but saw reference that ASA 9 was supposed to have this feature. Looking thru 9 and asdm 7 I'm not seeing how to. I know it just came out but I can't find any official mention of this feature in 9.
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Nov 23, 2010
Why is the DHCP Reservations List limited to 25 entries? Is there a beta firmware version that allows more?
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Jan 2, 2012
I have a DIR-615 router running FW version 3.01 with Hardware Version: C1 , my xbox is wired to my router. When I port forwarded, i had an strict nat, but had the best connection, but not by very much. When i put DMZ on, i had a strict nat, and the connection to other people was a bit better then UPnP.When i had UPnP on i had a open nat, i could barely be able to connect to anyone.what is a DHCP Reservations List?
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Jan 13, 2010
I have a setup using LogMeIn Hamachi and the network type creates a Windows Bridge. I also use the DHCP Reservations List to assign the same IP to specific devices. Well I have the MAC Address for my NIC in the list which works when I am not using the bridge. When using the bridge, of course the MAC address changes and when I try to add it to the list I get the following message in a popup window. The MAC Address is 02:e0:61:05:45:3e I have tried manually entering it, letting the router enter it from the list of computers and just to rule out something stupid, I have tried changing the letters to upper case and removing the colons.
Another issue I can see when this issue is resolved is that I do not believe it will let me add this reservation since I will be using the same IP used by another reservation. My DGL-4500 allowed this if I had the other reservations using the same IP disabled.Below these comments/rants are some feature requests. I have put them last as some of the requests are explained in the comment/rant section.I have read through this list and I have to say that after I purchased the router, which I ordered on-line, I was dreading it, but I have not had issues. It is possible that I am not using features that cause this issue. I believe the issues occur when using certain configurations with the "Enable Advanced DNS Service" enabled. I am not using this service. Since I knew people were having issue s with it, I wanted to see my results leaving that out. I have had this router running since a week before Christmas and I have many Virtual Server entires, QoS and port forwarding entries, https based remote administration, both 5GHz and 2.4GHz networks enabled supporting a/b/g/n(on both networks) and a guest network enabled on both bands all supporting WPA (TKIP and AES). I have 2 Giga wired connections that are always active, a 100Mb connection that is on an off but used almost daily, 2 Laptops that use the 2.4GHz network daily and one is 802.11g 54Mb and the other is 802.11n 150Mb and they are on at the same time almost daily, a printer that is on and used multiple times a week that uses 802.11g and a game system that uses 802.11a this device is used daily. Most devices are on and used at the same time daily and we have a good deal of regular Internet traffic and moderate other network traffic during these times. At night all computers are backed up over the network and most of the other network devices are off or not during this time. Other than having to reboot my Internet hardware provided by my ISP, I have not had issues. The router has been rebooted for config changes and I usually cycle it when I cycle the Internet hardware. Point is, so far no issues, good performance and it works and I have of course had other devices connected using the guest network and I have been testing features, performance, etc.
What's up with having so much variation in how features work across routers?e.g. My DHCP Reservation issue above. This router does not work with a setup like my DGL-4500.This router allows a preset amount of services like QoS and Virtual Server entries while the DGL-4500 just lets you add entries. Now maybe there is a limit and it just looks like there is no limit. Of course, there is at least a limit that is reached when you have used a certain amount of memory with the configuration.so many routers while leaving gaps and the lack of feature explanation and comparison?I switched to this router because I wanted a dual band setup which my DGL-4500 does not provide. That leads to the issue of the new way D-Link deals with dual-band. When I purchased the router it did not list that you had to choose 2.4GHz or 5GHz or it is not simultaneous dual-band. I was duped because I used to install DWL-7100AP for people that needed better wireless options for home businesses and small businesses and that provides simultaneous dual-band and back then if it was dual-band it was simultaneous. But I am disappointed in some of the features lost like WISH support and a few options here and there which do not seem like they are specific to gaming routers and this router is more on the mid range and low high range end of consumer, prosumer, home business and lower traffic small business routers, so why is it missing these features and why does it have the limitations I listed in the "variation in how features work" section above?
Other examples of lack of feature clarity are with Game Fuel, HD FUEL and Intelligent QoS. Isn't Game Fuel Intelligent QoS of some sort. Now from the example provided in the overview for the DGL-4500, Game Fuel optimizes game performance, but it does not say this is automatic or if it works along with the rules you set in the Game Fuel section which is the same as the QoS Engine section in the DIR-825. The difference is that the DIR-825 has a "Enable QoS Engine" option while the DGL-4500 has an "Enable Game Fuel" option. It seems that Intelligent QoS does what Game Fuel does, but expands that to VOIP, Media Streaming, etc. and it may be more automatic. HD Fuel in the only place I have seen it mentioned seems to refer to the combination of Intelligent QoS and the inclusion of 5GHz wireless support. Of course there is no version and feature documentation and in fact while the overview of the DIR-825 talks about gaming with Intelligent QoS, but if you bring up a comparison of routers, the chart has no in the gaming section for the DIR-825. I can't say I have noticed better or worse gaming performance with the DIR-825 compared with the DGL-4500, but given the shear lack of documentation on how to use Game Fuel and Intelligent QoS properly, who knows if I have this setup correctly. I will say the QoS Engine section in the DIR-825 is easier to use than the Game Fuel section in the DGL-4500.
1) The ability to reduce the brightness of the status lights, set them to solid if enabled with brightness options and to set them to off with an option to have some very faint light to show that the router is on. Of course I should be able to set different options to be applied at specific times.
2) Add the applicable features missing from the DIR-825 that are found in the DGL-4500 and applicable features from other routers. Also, get them all so they work the same on each router and let get the best from them all and make that the standard. e.g. In my DHCP reservation example above don't set the standard to the limitations of the DIR-825, but make the DGL-4500 function set or better function set of all routers combined for each feature the standard with-in router categories. e.g. the DIR-825, DGL-4500 and DIR-855 would be in the high end router category for consumer, prosumer, home business and lower traffic small business routers.
3) For DHCP reservations, you should not be limited to the DHCP IP Address Range.
4) On the log-in screen, get a better captcha and fix the tab order.
5) Add a log-out option in the web interface.
6) Allow for a next hop option in the DCHP server section. It would be cool, if there could be a list of IPs allows one to be enabled at a time.
7) Allow different DHCP server settings for each network. There are 5 on the DIR-825. Wired, 2.4GHz regular, 2.4GHz Guest, 5GHz regular and 5GHz Guest. Would be nice if you could set a couple of VLANs on the Ethernet ports and then have different DHCP setings for each VLAN.
For guest wireless networks, allow rules to be set to allow access to certain services on the network. E.g. I may want to allow printing. So allow a single port or multiple ports with easy settings for consecutive port ranges to be opened to an IP, IP range or all IPs and allow all ports for an IP or range of IPs. Of course, leave the allow full access option.
8a) Allow users to set rule sets that can be enabled/disabled like the full access option.
8b) Allow a control that can be set in the rule sets that controls if the wireless devices can talk to each other and another that controls if they can access devices on the wired network and another that controls if the wireless devices can access the Internet.
8c) Allow rules above to be limited to be applied to specific MAC Addresses.
8d) These options would be good to have for the non-guest wireless networks and wired network as well.
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Mar 7, 2011
I have an ASA 5540 cluster that is configured as my remote access VPN point. Users connect using IPSEC Profiles with Cert based authentication, the profile is configured to query two DHCP servers (infoblox appliance servers).
The problem I am encountering, is that I need to make reservations on the DHCP server for some users for specific business needs. What happens is that the ASA passes the request to the DHCP server with it's own MAC address and not the MAC of the remote host.
Is there any way I can configure the ASA to pass the request using the hosts actual MAC address?
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May 19, 2013
I'm having troubles with this firmware in a SG300-28 switch. Actually the DHCP server, a new feature in this firmware release, doesn't work correctly. DHCP static reservations are not working: CLient ID and MAC address are not recognized correctly, and the DHCP server assigns the first free IP in the pool, rather than the reserved one.If Cisco engineers read this, plese correct the issue.
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Feb 19, 2012
This is on a DIR-655, firmware 2.01NA, hardware rev B1.Is there a limit on the number of DHCP reservations that can be added to this WAP?This WAP was working fine with 10 DHCP reservations (wired & wireless devices), 6 schedules, Access control of 2 devices by MAC (6 defined, only 2-3 active at a time).I started adding additional DHCP reservations, because I'm simplifiying my network, and when I add the 26th DHCP reservation I get the message "Schedule rules is Full! Please Delete an Entry."
I've been adding all of the new DHCP reservations as disabled, but I haven't assigned any schedules or otherwise to these new devices yet. So what's up with this message??
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May 1, 2011
1. To specify static IPs for components on my network, is it simply a matter of reserving each component in the DHCP Reservations List portion of the Network Settings page?
2. On the same page, in the DHCP Server Settings portion, if Enable DHCP Server : is deselected, does this mean that only the hosts specified in the DHCP Reservations List can access the network? In other words, is access now restricted to these entries?
3. If the DIR-615 is powered OFF, will the above settings, etc. be lost (similar to a reset)?
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Jun 12, 2013
I've a Cisco 1941W router which is DHCP server for data-VLANs and uses ip-helper for voice-VLANs. [code] I don't know why I can't have IP from wireless voice VLAN whereas it is OK and wired voice VLAN and conf is the same!
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May 28, 2013
I have customer who has as Core Switch one Cisco Catalyst 3750 with the IOS c3750-ipbase-mz.122-35.SE5.I know that this image support DHCP Server configuration, but I like to implementate new vlans (approx 15) and I want to know if this switch support 15 DHCP Servers.
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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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Mar 27, 2012
I have trouble with a Cisco 892 Router from my Internet service provider.
Last week we switched from a virtual Router to a hardware Router. But after plugging it in our LAN Switch, the Windows DHCP Server stopped leasing IP's. I got many BAD_ADDRESS with MAC like e1:80:10:ac, e2:80:10:ac, e3:80:10:ac, e4:80:10:ac, e5:80:10:ac, ea:80:10:ac, eb:80:10:ac, ec:80:10:ac and so on.
I do not have access to the Router config, so I can not dump the config to you. We have a flat LAN, single SUB-Net(172.16.0.0/16) and no VLAN, no Spanning Tree. A Keep it Simple, Stupid(KISS) System.
A tech guy from service provider, is telling us, the error is not there fault and my switch is not correctly configured. But this is ********. For years we had a another Cisco Router from the precursor ISP and for 2 years the virtual Router from our current ISP. No trouble with my DHCP. But after plugging the new Router in, my DHCP stopped working.On the 892 is no running DHCP, but something interferences with my Windows Server 2008 R2 SP1 DHCP Server.
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Nov 14, 2011
it's possible to let the Nexus 5548UP act as a DHCP server? (or if it will be possible in future releases)
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Jan 24, 2013
I seem to be having a problem with DNS name resolution after configuring my router (Cisco 3725 running IOS image: c3725-adventerprisek9-mz.124-25.bin) for handling DHCP requests.
Before I made the change, everything was working correctly; I could ping Google.com from a computer inside my LAN and would get response from one of Google's public IP's like normal.
I had a separate DHCP/DNS server running Windows Server 2008 handling the DHCP request and DNS queries.
When I made the change, I turned off the DHCP/DNS server and issued the following DHCP commands to my router:
Code...
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Jun 5, 2013
I receive a question from a future customer about this future if its supported on " WS-C2960S-24PS-L":configuring 2 dhcp server on this swith ( 1 dhcp for voice vlan , and 1 for Data Vlan).I did some search , but i didnt find the answer .i have to advice a customer before ordering the switch.
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Apr 24, 2011
On a 4500 switch port , defined as access vlan 10, if the user connects his own dhcp server ( instead of the normal pc that should be connected ), will it cause issues with my existing network. the existing network is all static ip. In above case, will the dhcp server start looking out and assign dhcp ip's , if a user unknowingly removes his static ip and changes to obtain ip via dhcp option on the lan properties.
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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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Oct 26, 2011
Can I configure a DHCP Servero on the Nexus 7018?
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Feb 10, 2013
I need to buy a cheap Cisco switch with DHCP server.Can you confirm that 2960-24-S, 2960-24TC-S and 2960-48TC-S be a DHCP server?
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Apr 17, 2013
I have a DHCP server for a subnet that has only lightweight WAP's in it. The DHCP server is running on the gateway for this subnet which is a 3750X 2 switch stack running 12.2(53r)se2.I have the following configured:
ip dhcp excluded-address 10.1.10.161 10.1.10.162
ip dhcp pool DHCP-VL20
network 10.1.10.160 255.255.255.224
domain-name mydomain.net
dns-server 10.11.11.30 10.11.11.40
default-router 10.1.10.161
ease 3
The server hands out up to 18 IP addresses and no more, with 20 devices on the subnet. Scanning the subnet with a 3rd party network management system I see the following IP's never get handed out or used:
10.1.10.161 - 162 (manually excluded)
10.1.10.167 - 168
10.1.10.171 - 176
10.1.10.178
and of course 2 IP's I have manually excluded, 11 IP's in all that wont get handed out. It should only be 2 that don't get handed out. I've double and triple checked the exclusion and thats the only one. so I run a 'sh ip dhcp pool' and see this:
Pool DHCP-VL20 :
Utilization mark (high/low) : 100 / 0
Subnet size (first/next) : 0 / 0
Total addresses : 30
[code]....
[edit]I should also mention that "sh ip dhcp bind" does not show these randomly excluded IP's in use. They also do not show up in any arp table I can find.I have looked all over the config and I cant find where these extra 9 addresses are being excluded. how to free up these 9 seemingly random exclusions? Haven't issued a reload and I haven't deleted and rebuilt the DHCP server yet, production network.
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May 4, 2012
I am wondering if it has its own DHCP router and if theres a command to enable it?Also Random side question. it hands out ip addresses to other devices (the 2950 im using infront of a router) but when I hook up another switch to this switch it doesnt initialize the port or try to connect? why.
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Dec 24, 2011
On a 4500 switch port , defined as access vlan 10, if the user connects his own dhcp server ( instead of the normal pc that should be connected ), will it cause issues with my existing network. the existing network is all static ip. In above case, will the dhcp server start looking out and assign dhcp ip's , if a user unknowingly removes his static ip and changes to obtain ip via dhcp option on the lan properties.
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Oct 7, 2012
I just trying to setup a dhcp server in my catalyst 3560 switch for a nortel ip phones. I show you mmy configuration:
VOICE VLAN: 3
DATA VLAN: 1
S1:10.2.110.200
port:4100
Nortel IP Phones: IP 2002 (Firmware Version 0604D9H) & IP 1110 (Firmware Version 0623C7)
Switch Configuration:
aaa new-model!aaa session-id commonip subnet-zeroip routing!ip dhcp pool datos network 10.2.100.0 255.255.255.0 default-router 10.2.100.1 lease 0 2!ip dhcp pool voice network 10.2.110.0 255.255.255.0 default-router 10.2.110.200 option 191 ascii "VLAN-A:3" option 128 ascii "Nortel-i2004-A,10.2.100.200:4100,1,5." lease 0 2!!!!no file verify autospanning-tree mode pvstspanning-tree extend system-id!vlan internal allocation policy
[Code]...
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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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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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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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