DHCP Server Conflict - SBS2011 Router
Oct 8, 2012
Im setting up SBS 2011 in a new office. From what I understand, SBS 2011 needs to be the network DHCP server for everything to run well under Active Directory. The conflict is with a FIOS router, that also �needs� to be the DHCP server in order to communicate with a set-top box (MOCA bridge.) Verizon lists a handful of network configurations with multiple routers that might work, although completely unsupported. Is it possible for router, SBS2011, and set-top box to coexist in harmony on the same network (preferably keeping DHCP server on the SBS box)?
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Mar 15, 2011
I have a Cisco 3750 running DHCP. We have a lot of guest users on the network, so the DHCP conflict table fills up quickly, and when it does, users can not get on the wireless network. I have to go in and clear the DHCP conflict log. (clear ip dhcp conflict *) and the problem is resolved. I see in the Cisco documentation if you don't have a DHCP database agent configured you should disable that log. I just want to make sure what the steps are and the ramifications are of disabling that log. Would IP address's still be freed up to use on the network? It also said about enabling 'ip dhcp ping' so DHCP will ping the address first to see if it's available.
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Jun 13, 2012
DHCP conflict on 881-W with the internal AP?I have (12) 881-W chassis in the field. They are running DHCP services to the wired users as well as to the internal AP for reachability / management / etc. The scope for the internal AP is a /30 so only one address is in the scope and it is intended for the internal AP. This serves a a point to point link between the internal AP and the internal Router inside the 881-W chassis.
Somehow the 881-W DHCP server is getting out of synch and a conflict is occurring. It seems at some point, either at boot-up or lease expiration/renewal, the DHCP server is performing a ping to verify that the address is not in use. The AP has this address assigned prior and replies to the ping causing a conflict. I noticed an AP down today, checked the 881-W uptime and the conflict correlates to the same time. I have to manually clear the conflict and everything works as it should.The existing 12 881-w's could grow to 100's over time, so the manual intervention of clearing the conflict is not going to scale. I really want to stay away from static reservations.
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Apr 21, 2013
We have VSS configured between Cat-6509 switches (s72033-advipservicesk9-mz.151-1.SY.bin)..For the voice vlans,dhcp scope is configured within VSS and ip addresses are assigned to ip phones from these pools configured within VSS.Cat 3750 stack is connected with dual links to this vss. IP phones are connected to cat 3750 switches and desktop is connected back to IP phone. For data vlans IP addresses are assigned from external dhcp server.
Currently we are facing lot of ip conflicts for ip phones and after clearing the dhcp conflicts, IP phones starting getting IP addresses..(sufficient IP's do available in the dhcp scope for IP address assignment). (What exactly the role of no ip dhcp conflict logging command......)
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May 10, 2013
I configured an DHCP server on cisco 3750 switch . Wher in w3750 gets connected to plain l2 switch 2960 on floor and machine gets connected to 2960 port. [code] Below is the description of problem:
-> The Cisco 3750 switch is the DHCP server. VLAN 108 is named as internet vlan.
-> Ports in Cisco 2960 switch has been configured with "switchport access vlan 108".
-> There were no problems at all and everything had been working smoothly.
-> 3 days back, users started complaining that they couldn't access the internet. Up on troubleshooting the issue, I found out that there was an issue with the DHCP server as the computer couldn't get any IP address at all. After setting static IP address, the internet started working again.
If I bind IP to MAc address reservation on core 3750 switch for some time of moment it works but after that machine gets unreachable .I restarted the 3750 switch and also all the 2960 switches over the weekend, however, the issue still hasn't been resolved yet. I did issue the command "clear ip dhcp conflict *", clear ip dhcp binding * but no joy at all.
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Aug 21, 2012
I'm using a Thomson TG784 router, but it can't get it's DHCP server. This is what it gives me once I let it configure itself.
Note: I pressed the reset button on the router and reset it to the factory defaults.
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Aug 10, 2012
i have a problem suddenly cant connect through router anymore.. it said "DHCP server PPPoE not found" but the day before yesterday i can connect.. but if i connect without router (modem to PC/lappie) My router : Buffalo Airstation WHR-HP-G300N, i have tried several action like reset router into factory setting but couldnt solve my problem. i realize recently that DHCP thing cant find any IP address anymore.. is that my router problem/my ISP? when i try wired connection, i realize too.. My IP address, DNS become some what different than usual.
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Jun 11, 2012
FiOS gave me an Actiontec router that every other day is getting into a state where it refuses to give out IP addresses via DHCP. I have to reset the router to get it to work again.This seems ot have started in the last year, I assume due to some piece of equipment I added, or perhaps the VPN software or Windows 7 installed on my work laptop. I've not been able to figure out what is tripping up the Actiontec router, so I decided to try moving the DHCP function over the WRT610N that I have. I basically had the WRT610N setup without DHCP enabled, no NAT and no RIP, so it was basically just working as an access point. I left the Actiontec at 192.168.1.1 and assigned 192.168.1.2 to the WRT610N on the LAN side, while the WAN side is left disconnected.
I disabled DHCP on the Actiontec and enabled it on the WRT610N. I also set the DNS server to 192.168.1.1 so it would go to the Actiontec for name resolution. Using nslookup from a command prompt on a PC wireless connected to the WRT610N, I can see that names are indeed getting resolved. However, it looks like the WRT610N is setting itself up as a the gateway at 192.168.1.2. When trying to ping something out on the net, I get a message back saying that 192.168.1.2 is reporting the address as unreachable.
I assume this is because the WRT610N is handing out its own address (192.168.1.2) as the gateway. Is there anyway to get the WRT610N to hand out a different gateway address than itself? Optionally, is there a way to get the WRT610N to route requests coming to it over the Actiontec?I suppose I could just ditch the Actiontec altogether, but it seems a bit easier to use to setup port forwards and the like for various servers we have running. It also has a coax MoCA interface which I believe our FiOS set-top boxes use for their internet connectivity, so I don't want to lose that.
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Dec 4, 2011
The e4200 1.0.03 DHCP server appears to be quite buggy. After configuring a static IP / reservation for a client which already had a dynamic IP from the pool, the e4200 continued to offer this client its pool IP. However, the DHCP client listing in the e4200 showed the client having the static IP even though it was still being offered that pool address.This may sound like user error, but I can assure you, it is not. I have had a very frustrating experience with this product, and rather than fool with tech support again, I ran `tcpdump -e -s1600 -n -vvvv -i eth0 port bootpc or port bootps` to absolutely rule out a mistake on my part, bug in the DHCP client, etc. I found that the client was always offered that old IP, even thought the e4200 status display showed the "new" static one, after doing a DHCPDISCOVER without requesting a specific IP. This condition persists across e4200 reboots even after having the client release its lease!I finally was able to resolve this by forcing the client to request the static IP from the e4200.This is unquestionably a bug in the DHCP server, and additionally, the user interface does not show the real state of the underlying DHCP leases held by clients which have static addresses / reservations. Troubleshooting this condition is well beyond the abilities of the average user.
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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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Oct 12, 2012
I have the ea6500 and was wondering what the DHCP server is for? I turned it off and everything seems to be able to connect without it. Am I missing something? Also, when I disable clone my pc's MAC addy, I can't connect to the internet. (My computer is hard wired to the router).
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Sep 29, 2011
i am facing the same problem now but am using windows 2003 server
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Sep 22, 2011
Recently i had suffering with wireless connection problem, currently my wireless router connected to WAN directly, after that go into firewall and then go thru switch to end user PC, for LAN user there is no issue, but for wireless connected PC it is prompted with limited connectivity problem(DHCP is disable on router), after check with ipconfig /all. it seem likely due to wireless PC cannot get the IP from DHCP server. i am using DLink615 router. i had checked firewall setting there is firewall policy that connected all router ip into company LAN, but i don't think there is DHCP VPN setting up. is there anyway i can go thru firewall and get IP from DHCP server because if i set up DHCP on router, it cannot pass thru and access to LAN.
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Dec 27, 2012
Is there a way to get the E4200 to NOT provide itself as a dns server to the DHCP clients? I have the unit set up to provide two dns servers to the clients, but the 4200 always provides itself as a third and it uses my cable providers dns servers. I am using a dns based filtering service to prevent certain material from being accessed within my network as the first two resolvers. So long as both or one of the provided servers is working it doesn't fall back to the unfiltered third, but I would prefer to remove it entirely.
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Jan 4, 2012
I just bought a Linksys E4200v2 router and updated the firmware to 2.0.26.124551. The DHCP server is turned on however, it won't issue any IP addresses. I have to set IP reservations for all of my devices in order for the router to give them an IP address. This includes my printer, xbox360 and 2 computers. I'm also having this problem with the wired and wireless lan.
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Jul 8, 2011
I just bought an e4200. I was using a LinkSys WRT54GS running DD-WRT alternative firmware.
One feature that I really liked in DD-WRT was the ability to assign static IP leases from the DHCP server. I liked having all of my devices running with a predictable, known IP address on my network. I have a Home Theater PC, and various controller applications that run on iPhones, etc. - some pretty homebrewed. Configuring the firewalls, etc. was much easier with IP address based controls.
Is there a way to achieve the same within the e4200's stock firmware?
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Nov 24, 2012
The router always inserts its’ own address as the primary DNS server for the all DHCP clients even though you have set the DHCP server on the router to assign manual external addresses?
Oh I have a
WRT310n v2
firmware v2.0.01 build 004
Let me elaborate a little so I am clear what I am saying. On the router setup page go to the section that is labeled “DHCP server settings” enter 3 static DNS servers. Say 2 Google and one open dns.
8.8.8.8
8.8.4.4
208.67.222.222
Apply your settings.
Release your ip on your workstation, then renew it. And look at your DNS, the routers address is still the first entry.
DNS Servers . . . . . . . . . . . : 192.168.1.1
I suspect this was probably a design decision so that they could allow a user to open their web browser and type something neat like [URL]. Which for the average user is fine and dandy. If my ISP didn’t suck and try to redirect everything to cached copies I probably wouldn’t have noticed it. But since I end up using the router for DNS and it picks up DNS from my ISP I end up getting Akamai IP addresses, and they have problems with SSL certs…. So you get errors.
I know I can go set the DNS server settings on the workstations. But I really don’t want to do this on all of my devices as they are mobile and switch networks, and on some networks not using the local dns breaks things. Like on the corporate network.
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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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May 6, 2012
[code]...
I am able to obtain IP addresses through the DHCP server for my clients and I am able to browse internet on the server 2k8.Server 2008 - Share Internet through DHCP server
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Mar 5, 2012
On my new E4200v2, after I tried to move beyond the disappointment of Cisco removing Internet Access Policy entirely, I decided to give the stripped down Parental Controls a try.
Sadly, I didn't have any luck doing what I needed to do... block my Tivo's from accessing Youtube.
I enabled Parental Controls, Added the Target Devices (my Tivo's did show up), and added "Youtube.com" as blocked site #1. Saved. Entered the parental password when prompted. Even rebooted the router.
But Youtube wasn't blocked. So I added to the target list a non-Tivo device (a Macbook) for a reality check, and rebooted the router again... still no luck. Youtube still not blocked.
So then I started to wonder if their Parental Control depends somehow on the local DHCP server & Client list. Because my E4200 has DHCP Server = OFF (I have always used a Windows Server for DHCP).
I tried to call Linksys support to get this working, but after 45 mins, including escalation to senior engineer, they really were pretty useless (no real familiariarity with my problem) then they disconnected my call!
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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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Sep 6, 2011
How many IP address can handle the DHCP server of the RV0xx Series VPN router? can be configured for more than 250 ip addresses? it is posible to configure the router in order to have more than 250 ip address?
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Aug 1, 2012
My neighbour n myself are using a shared internet connection. The modem is situated in his house and I have connected to that modem using a LAN cable, which comes to my house. That LAN cable goes into my WiFi router (through which I use the internet connection). I use a Lap and my neighbour a Desktop, he's receiving a "IP address conflict error" in his system, due to which his internet connection is getting disrupted. If I don't use my Wifi router and connect directly through the LAN cable he does not face any problem. But I need my router back?
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Feb 4, 2011
I have a Netgear DG834PN Router. Connected to it usually are 2-3 laptops (XP, Vista, 7) wirelessly, a Xbox 360 and Win 7 PC via cables, a wireless printer and often an iPod touch, however PS3s, mobile phones etc are connected occasionally.
It had been functionally normally.until we changed ISP after ours was taken over (we didn't change but the provider obviously now has). However, since then (1st Feb) we've been having connection issues, probably an IP address conflict where items can access the router but not the internet.
The iPod and Xbox sometimes don't connect, as do the laptops often after been powered up from a sleep. Yesterday, when powering up one of the laptops, I got an IP address conflict message. Restarting the router sometimes works, but mostly it allows one device on and not another.
The printer has a static IP address (192.168.0.4) that I had to set up to get it working, but this has been active for months now without issue. I've had a look in the router settings and it's set up for DHCP as default with IP addresses from 192.168.0.2 to 192.168.0.254 so I don't understand why it has this issue suddenly. I had a look at the connected devices list, and everything appeared to have its own IP address.
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Jun 26, 2012
I recently changed my home configuration. I have AT&T DSL and I replaced my 2WIRE gateway with an AT&T provided Motorola Modem and a Linksys E2500 router on Sunday. For the last few days, all has been good. Last night and this morning, one of the computers in the house began getting IP conflict messages. The computer is provided by my company and uses the Cisco VPN client. I am not sure if it is conflicting because of the VPN (only seems to happen when it's connected) or with one of the other devices on the network (i have four other computers, a game system, and a few phones on the network).
Is there a way to prevent a conflict from happening again? My work requires me to have a constant connection for days at a time and these IP conflicts are causing constant headaches. Would creating a static IP address on the work computer outside of the DHCP range clear this up?
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Mar 23, 2011
How do I improve my Wireless Network Environment
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Apr 7, 2013
I have an issue that started showing up since I bought a new computer. The old computer ran XP, the new one runs Windows 7. Almost every time I start the computer I get an error message telling me Windows has detected an IP conflict. Sometimes when I click okay I get the message a second timeAbout half the time, I have no internet connection when I start up and have to restart my router, which fixes the problem (after restarting the modem, I do not need to do anything like renew with ipconfig; it just starts working). I do this so often I attached it to a power switch to make it easier than unplugging.My setup is this. My PC is connected to a router connected to my cable modem. The router is also connected to a wireless hub. This hub is used by only one device, my Wii U. I can get the error message even if my Wii U is turned off.
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Apr 30, 2011
I am getting a window message which is saying ''Window has detected an IP address conflict. there is another pc on this network that is using the same Ip address.
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Jan 24, 2013
I get a "IP address conflict" message on my wireless network. Using a WRVS4400n wireless router with the latest firmware that is set to PPoE. Motorola 336 dsl modem is set to bridge mode. My network has 2 computers attached: hardwire desktop and wireless connection to laptop. When I contacted ATT support, they said the problem is in the wireless modem. Are there some settings in the WRVS4400n that must be set to insure that each computer gets a different IP address?
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Feb 11, 2013
I have just got viasat internet from England to replace the local internet here in Spain. I believe that My router was programmed to the old internet and wont recognize my new modem. I have tried live chat and got guided thru a few things and established an IP conflict, but lost contact before we found a solution.
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May 3, 2013
I m getting the below debug log and can not get IP from my ISP. It is static IP address and there is modem in bridge mode for the adsl line.
Below Conf and debug out put,interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
pppoe enable group global
pppoe-client dial-pool-number 2
end
[Code]....
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Dec 20, 2012
I have a Belkin N Wireless Router Model F5D8236, which has served my laptop with wireless and my wifes desktop computer through a ethernet cable for the last year.Recently we had to move her computer to another room so I got a Usb Wireless adapterNow when I try to connect her desktop to the network it says the settings do not match, or when prompeted for the PSK, it says its wrong, even though I'm dead sure I put it in right.I've tried transferring a copy of the settings with a flash drive, I tried resetting the router a dozen times, and all the wp2 settings.The USB adapter works, because when I turn the security feature off on the router, suddenly it can connect to the network.
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