Can WRT600N DHCP server actually be disabled?

I have tried disabling the DHCP server on my WRT600N (with the original firmware 1.01.35 build 5), but it doesn't seem to be disabled. I have another machine on my internal network with a DHCP server which returns itself as the DNS address (and that DNS server in turn resolves my internal domain and defers other requests to the router). On my desktop PC each morning, presumably after it tries to renew the DHCP lease, the PC is unable to resolve internal hostnames, because the WRT600N is listed again as the DHCP server (which sends itself and the service provider DNS addresses as the DNS servers). After this, I verify that the WRT600N still shows the DHCP server as being supposedly disabled. Is this a known bug, and is a firmware fix in the works? Thanks.

I too have the same problem!
I have a stand alone DHCP server on my network. The DHCP server on the WRT600N is disabled in the GUI, but it keeps turning itself on after a few hours and messing up my internal network.
I have tried hard resetting the router to factory defaults (30 Sec reset switch) and also re-flashed the latest firmware a couple of times with a hard reset included.
(Mod note: Edited post for guideline compliance. Thanks!)
Message Edited by JOHNDOE_06 on 12-21-2008 09:22 AM

Similar Messages

WRT600n DHCP server

I'm using a Cisco WRT600N (1.01.36 build 4) and cannot figure out how to keep the DHCP server disabled. There's another DHCP server on my network, and the WRT600n messes things up all the time. Disabling the feature on the WRT600n, then rebooting keeps it off for at most a day or so, but then it re-enables itself while the GUI shows it as disabled.
This is unexpected behavior and should not happen with a mature firmware release.

Hi, My name is Eric Moyers. I am a Network Support Engineer in the Cisco Small Business Support Center. Thank you for using the Cisco Community Post Forums.
The WRT600N is one of our Consumer Routers. You should look here for help with that device.
http://homesupport.cisco.com/en-us/wireless/lbc/WRT600N/
If this had been on of our devices, I would first suggest making sure that the FW is up to date. Then doing a factory reset and manually reconfiguring the device. If that does not work, I would call the Consumer Support line 1-800-326-7114
Thanks
Eric Moyers
Cisco Network Support Engineer
SBSC Wireless and Surveillance SME
CCNA, CCNA-Wireless
1-866-606-1866

IPV6 clients cannot ping each other while getting IP from DHCP server running in windows 2008

I have two windows 7 clients and a windows 2008 server connected to a switch with static IP 172:16:5::1/64.
DHCP server is configured with static IP 172:16:5::20/64
when i statically assign IP to windows 7 clients like 172:16:5::21 & ::22, they can ping each other. if they get ip from DHCP server, they cannot ping each other.
if i configure the gateway (172:16:5::1) in the clients manually, they can ping each other.
is there any way we can make dhcp server to give gateway to the clients along with IP?

From what I have gathered:
IPv6 won't route because the DHCP server is setup in 'stateless' mode and the switches do not support IPv6. (
"But if your routers are not IPv6 supported (yet), you can
reconfigure DHCPv6 to Disable Stateless mode, and that'll issue IPv6 addresses that
will eliminate the Ping problem." -
http://www.networkworld.com/article/2228461/microsoft-subnet/setting-up-dhcpv6-to-dynamically-issue-ipv6-addresses-in-a-network.html)
So you must change to 'disable stateless' mode. Which the only way I can THINK to do this is to uninstall DHCP and reinstall DHCP and select 'disable stateless' during the installation (which I haven't confirmed). (In
case, “Disable DHCPv6 stateless mode for this server” option was selected duringrole installation" -
http://blogs.technet.com/b/teamdhcp/archive/2009/03/03/dhcpv6-understanding-of-address-configuration-in-automatic-mode-and-installation-of-dhcpv6-server.aspx)
zz.. but my understanding of DHCP is fragmented, please take what I find with a grain of salt. I am off to reinstall DHCP :] .. fun.
Mediocre Access 2010 | (Baby) Beginner C Sharp | OK at Active Directory (2012) | Fragmented understanding of DNS/DHCP | Laughable experience with Group Policy | Expert question asker on MSDN Forums

SF/SG 300 DHCP server

Hi,
is it possible for SF/SG300 switches to be used as DHCP server for non-management VLAN-s.
The switch has VLAN1 as management VLAN - has IP address assigned.
The switch has additional VLAN - VLAN200 and I'd like SG300 to act as DHCP server for clients on this VLAN.
Is this possible at all?

Hi Jernej, the switch must operate in layer 3 mode. You can enable dhcp server per vlan.
To qualify to make a DHCP pool for a layer 3 vlan, none of the vlan interface can have an IP address issued via DHCP, so you vlan 1 and 200 must have a static ip address assigned. The vlan 1 does not require dhcp server configured for vlan 200 to have one.
Here is a sample configuration
config t
vlan database
vlan 200
exit
interface vlan 1
ip address 192.168.100.137 255.255.255.0
no ip address dhcp
exit
interface vlan 200
ip address 192.168.99.1 255.255.255.0
exit
ip dhcp server
ip dhcp pool network test
address low 192.168.99.1 high 192.168.99.254 255.255.255.0
default-router 192.168.99.1
dns-server 8.8.8.8
-Tom
Please mark answered for helpful posts

Can some one translate these instructions D-Link DI-524: installation as wireless HUB/Bridge General ON ALL TYPES OF ROUTERS DHCP SERVER HAS TO BE DISABLED ON ALL TYPES OF ROUTERS UPnP ALSO HAS TO BE DISABLED OTHERWISE YOU CAN SEVERELY HINDER OTHER USE

D-Link DI-524: installation as wireless HUB/Bridge
General
ON ALL TYPES OF ROUTERS DHCP SERVER HAS TO BE DISABLED
ON ALL TYPES OF ROUTERS UPnP ALSO HAS TO BE DISABLED
OTHERWISE YOU CAN SEVERELY HINDER OTHER USERS IN YOUR NEIGHBOURHOOD!
Practical example: D-Link DI-524
The DI-524 is a wireless router.Although the manufacturer doesn't mention this, you can also install this device as a wireless hub.Of course this is not supported by the manufacturer. Therefor you have nowhere to go in case of any problems Plug in the power cord of the DI-524. Do not yet connect the network cable!Search for existing wireless networks with your computer. Connect with the router.This can for example be done like this:
Click the start-button (at the bottom in the left corner of your screen).
Go to control panel
Go to internet connections (you may have to choose classic representation first)
You can now see your wireless network card, among other things. Right-click and 'View available Wireless networks'.
Connect to the router. In most cases the router will be called 'default'.Check your IP-address: you get an IP address from the DI-524
Go to the start-button
Go to 'Run'
Type 'cmd' and press enter
type 'ipconfig' and press enter
your IP address starts with 192.
Surf to your router with your regular browser. For this you need the address and a password, which you can find in the documentation.
In this case the address is 192.168.0.1
Now you must secure the router. For this it is best to use WPA-PSK
Your key is a randomly chosen sentence. Don't make this sentence too short.
Warning: Case sensitive!
You cannot reach the router anymore now.
Go back to your network card via "make connection". Search for your wireless network again and make a new connection
You are asked for a key. Supply this key the way you configured it in your router.
Surf back to the router.
Disable the DHCP server.
!! YOU HAVE TO DISABLE UPnP ON ALL TYPES OF ROUTERS
OTHERWISE YOU CAN SEVERELY HINDER OTHER USERS IN YOUR NEIGHBOURHOOD!
for this, go to Tools, Misc and switch off UPnP
Save these settings.
If you do not have a D-link router, look up in the manual or somewhere else where you can disable UPnP
Now you cannot reach the router anymore again.
It is only from this moment that you can connect the router to the modem.
Important: Use one of the 4 LAN ports. Never use the WAN port!
Go to your network card via the control panel. Right-click and "Repair"
Now you should get an IP-address in the range of 10.nnn.nnn.nnn
If you still don't have 192... you've made an error. The DI-524 still functions as a router and this is not allowed!

There are no Mac based instructions. The router is accessed and adjusted the same way whether you are using a Mac OS X, Windows or Linux. As noted in the other post it is done through your web browser which works the same from any computer. Even a Chrome Book.
akertrav wrote:
Thank you for that what I have been trying to do is extend the range of my wifi witha second dilink router. I was hoping for some mac based directions to achive this rather than the PC based as presented. Thank you for your ireply Paul

Can I use my WRT54G as a DHCP server only? I've got 5 dynamic IP's from Time Warner..

Hi everyone, I'm wondering if I can use my WRT54G as a DHCP server only only my network, without having to have any of my PC's plugged into it's router ports? I looked at the settings but I couldn't get it to work.
Here's why: I just got Time Warner Business Class cable internet which comes with 5 dynamic IP's. I want each computer, well 4 of them at least and 1 for the WRT54G, to have a unique IP when accessing the internet, and the other computers (5 more computers) to use the DHCP server in the WRT54G to get a NAT IP for use on the internet.
We play Diablo II on the internet and only 4 computers can be connected through 1 IP, so that limits us in my current configuration.
Current Equipment: One WRT54G, one Netgear GS116 16 port gigabit non-managed switch. One Time Warner Cable modem. Also attached to the network is one HP network printer, a Buffalo LinkStation NAS and a Zensonic Network DVD player.
Current config: Cable modem --> WRT54G --> Netgear switch.
Ideal config: Cable modem --> Netgear switch --> WRT54G.
With my current config, I am not taking advantage of the 5 dynamic IP's, but all the computers connected to the Netgear switch or the WRT54G can connect to the internet and the NAS.
So my ideal config (where I don't have to buy anything and where all the computers can print and access the NAS) is to connect all the computers and devices to the Netgear Switch and somehow force 4 of the computers and the WRT54G to get a dynamic IP from the cable modem, while the other computers and devices use the DHCP server on the WRT54G to get to the internet.
Is this possible?
I called Time Warner Cable and they weren't any help. I called the Linksys sales department and they weren't of much help either.
I suppose that I could purchase a new 8 port switch and attach 4 computers, the cable modem and the WRT54G to it. Then attach the Netgear to the WRT54G to accomodate the printer, NAS, and the other 5 computers. But in that senario, the 4 computers connected to the new switch can't print and can't reach the NAS. And geez, some computers would have to go through 3 devices to reach the internet, which has got to slow them down.
I did read about the Linksys EFG120 which has a DHCP server, but at $400 and only 120 gigs, it doesn't work for me.
I called Time Warner and the cost of more dynamic IP's is prohibitive, I'm already paying $79 a month for this internet and they want another $50 a month for 7 more dynamic IP's and that wouldn't help my NAS or my printer.
The cost of a 16 port gigabit switch with DHCP is an amazing $800 or so, which is out of the question.
Sorry for being so long winded and thanks for reading this far. I'm looking forward to any replies.

That is a hell of a setup. I don't know if it would be easier and cheaper to either buy a real router like a Cisco, get fixed IP addresses and a RV042, or buy 4 network cards for the four of the five computers which need the internet access for gaming.
O.K. First your setup:
1. You wire the modem to the 6-port switch.
2. You connect the remaining 5 ports with the WAN ports of 5 WRTs with DHCP on the WAN interface.
3. You configure each WRT with unique LAN IP addresses in the same subnet, e.g. 192.168.1.1/255.255.255.0, 192.168.1.2, 192.168.1.3, 192.168.1.4, 192.168.1.5.
4. You turn off all DHCP servers except on one, e.g. 192.168.1.1. That router will be the default router and internet connection for any client which gets dynamic LAN addresses (as fallback or guests, I would not configure the NAS or printer with DHCP addresses if you have everything else on static IP addresses). You can certainly disable all DHCP servers if you want, too.
5. Now you connect all WRTs with each other.
5a. You connect port 1 of the 1st WRT with port 1 of the 2nd.
You connect port 2 of the 2nd with port 1 of the 3rd.
Port 2 of the 3rd with port 1 of the 4th.
Port 2 of the 4th with port 1 of the 5th.
(Do not create a loop connecting port 2 of the 5th with port 2 of the 1st!!)
5b. You buy another switch and connect each port 1 of each router with this switch. This has the advantage that you don't have a long cascade between the 1st and the 5th router like in 5a.
6. You connect all devices to the LAN.
6a. If you did 5a, you will probably put each computer to the router which internet connection it uses. The NAS and printer could go anywhere.
6b. If you did 5b, you hopefully bought a 16 or 24 port switch. Then you plug simply everything into that switch. Otherwise you can certainly use the free ports of the WRTs like in 6a.
7. You configure all your devices with static IP addresses. For instance,
IP 192.168.1.11
netmask 255.255.255.0
gateway 192.168.1.1
For the DNS servers I would highly recommend to use the DNS servers of your ISP directly and not use the relay on 192.168.1.1.
The gateway address defines through which router the computer connects to the internet.
8. You may still have to configure port forwardings on the router to the game computer if required for the game.
An interesting alternative to this setup might be to buy 4/5 network cards for the 4/5 computers with direct internet access. Then you use the one network card to connect to your single LAN behind your single WRT. The other network card goes into the switch behind the modem and has direct internet access. You then have to tell Windows which of the network cards has the default gateway for the internet connection (to prevent routing all traffic through the LAN and the WRT to the internet). One game computer would have to be behind the WRT.

I want to disable the DHCP server on HH3 and use l...

Hi, i live in a flat with 5 other people so i have my HH3 connected to a linksys wrt5gl so that i can use the QoS capbilities of the linksys (tomato firmware). The linksys router can also limit bandwidth per ip address IF its also the DHCP server. When i disable the DHCP on the HH3 and enable it on the linksys the internet no longer works on any of the PC's, but if i have the DHCP on the hh3 i cannot limit bandwidth per ip on the linksys.
In the flat before this i managed to set this up fine (wasnt with the HH3- some other router) just need some advice on how to disable DHCP on the HH3 and enable it on the linksys wrt5gl whilst still being able to connect to the net.
Here is how its set up atm:
Phone line>>>HH3 (assighns IP through DHCP)>>>Linksys (data goes through QoS)>>>PC's/laptops/consoles in flat
Here is how i want it set up:
Phone line>>>HH3 (Acts as a modem)>>>Linksys (assighns IP through DHCP to allow bandwidth limiting /data goes through QoS)>>>PC's/laptops/consoles in flat
thanks in advance, sorry if this is hard to understand- im not so good at putting the problem into words
Solved!
Go to Solution.

Hi,
Don't know to be honest......but as an idea....you will have to disable DHCP server on the hub, apply a static ip to the Linksys, 192.168.1.100. You'll then need to set up DHCP on the Linksys....start ip 192.168.1.64 end 192.168.1.253, you'll need to add a subnet 255.255.255.0, then the gateway.....192.168.1.254 that's the ip address of the HH and that could be the real problem as normally the default gateway for DHCP on routers is the routers ip address.
So the chandes of it working are slim.....however you dont have to use your HH on your BT broadband you can use another make/model.
One option to use with that router is a Draytek 120 ADSL modem, which does PPOA to PPOE.

WLC CT2504: Interface IP can not be used as internal DHCP server IP

Hello all,
I've got a new CT2504 controller with software version 7.0.220.0
Regarding to
http://www.cisco.com/en/US/products/ps6366/products_tech_note09186a0080af5d13.shtml
I've tried to configure the internal DHCP on a dynamic-interface, but this is not possible:
(Cisco Controller) >config interface dhcp dynamic-interface vlan401 primary 172.16.x.3
vlan401 Interface IP can not be used as internal DHCP server IP
It works, if I use another IP (aka DHCP server) in the same subnet or in another subnet. It works also for the management interface.
(Cisco Controller) >show interface detailed management
Interface Name................................... management
MAC Address...................................... d0:c2:82:xx:xx:xx
IP Address....................................... 10.2.x.135
IP Netmask....................................... 255.255.255.240
IP Gateway....................................... 10.2.x.129
External NAT IP State............................ Disabled
External NAT IP Address.......................... 0.0.0.0
VLAN............................................. 400
Quarantine-vlan.................................. 0
Active Physical Port............................. 1
Primary Physical Port............................ 1
Backup Physical Port............................. Unconfigured
Primary DHCP Server.............................. 10.2.x.135
Secondary DHCP Server............................ Unconfigured
DHCP Option 82................................... Disabled
ACL.............................................. Unconfigured
AP Manager....................................... Yes
Guest Interface.................................. No
L2 Multicast..................................... Disabled
Scopes are defined and Proxy is enabled.
(Cisco Controller) >show dhcp summary
Scope Name                   Enabled          Address Range
ap                               Yes      10.2.x.137 -> 10.2.x.140
intern                            Yes      172.16.x.20 -> 172.16.x.30
(Cisco Controller) >show dhcp proxy
DHCP Proxy Behaviour: enabled
Has somebody an explanation for this issue?
Thanks in advance,
Regard,
Robert

You can use the internal dhcp, but you need to set the primary dhcp as the management ip. So in your dynamic interface, your primary dhcp is configure with the wlc management ip address. Dhcp proxy also needs to be enabled and is enabled by default.
Thanks,
Scott Fella
Sent from my iPhone

Wired ethernet can't communicate with DHCP server

Hi all
I have a Mac Mini running Mac OS X Server. I recently changed a bunch of network settings, and since then I can't get the Mac to acquire an address from DHCP through the wired connection.
The wireless ethernet connects to the same router and acquires it's IP address, DNS, and router information through DHCP without a problem.
The wired ethernet connection is unable to communicate with the DHCP server. The router detects it, and sees it as having it's self-assigned ip address (169.254.74.247). The subnet mask is wrong (255.255.0.0 vs. 255.255.255.0) as well. Both are greyed out in network preferences when DHCP is selected. I've tried all of the obvious steps (restarting networking, rebooting everything, running the diagnostic tool, disabling wireless airport, etc.) to get it to work, with no change.
I can get it to connect with a manually assigned IP, but that's not a long term solution for my network.
I have had this issue with multiple routers. Currently I'm using a gigabit-e router - netgear WNDR3700. Other machines connect to the router just fine through wired ethernet (xbox360 and linkstation mini).
I'm new to Mac OS, but not new to networking. Any help would be appreciated.

This might be an old discussion but it was helpful to me. Well, almost. After reading this discussion, I arrived the same place that xoofoo above did. After some poking around, I was able to find the answers. (Feel free to correct me if I'm wrong, please!)
Here's what I did:
Launch "Server Admin" in Applications/Server folder
Open the list of services by clicking on the triangle next to the Server listed in the left pane.
Click on "Firewall"
Click on "Settings" tab
Click on "Editing services for" and select "192.168-net" (or if necessary, select "any".)
In the window below, go down the list and tick both "DHCP and Netboot client" and "DHCPDISCOVER". (hint, this list is sorted by ports number, go down and look for port 68).
Click "Save".
That should do the trick! Hope this is helpful to others in the future.

Firmware update 7.5.2 is breaking workaround for disabling DHCP server

If you are using the trick described here (http://discussions.apple.com/thread.jspa?threadID=121990) to disable DHCP, you should know that after upgrading to 7.5.3, it will not work anymore. Downgrade to 7.4.2 makes it working again.
If somebody from Apple is reading this (and is interested in feedback, which I doubt, because there's no such option on the Support pages) - would it be possible to add an option to the AirPort configuration which would allow DHCP to be turned off (while NAT stays turned on)? It would be really nice...

Hmm, while typing previous message it gave me the following idea (and it worked)
Since i am using a mac mini as a server ( Debian, sorry ) it also has wlan, i set up the server so both are connected (eth0 / wlan0). Default of the dhcp server is to listen to all interfaces and voila DHCP for the wireless devices.
Hope this can help someone, without the need for downgrading your APE.

WRTU54G-TM Port Forward issues, DHCP server disabled but still gives out addresses

I've seen other posts about port-forwarding issues. I've had to hard-reset the device twice in 2 months to clear this up.
One issue that I can't figure out at all is that the DHCP server gives out addresses when it is set to disabled. This is a problem because it gives out the public DNS servers, which will not resolve addresses on my LAN. Anyone else seen this?
Anyone had success putting this router behind a better one and still getting the phone SIM to register and work?

Have you tried to upgrade the firmware on your Router?
Click Download the latest firmware for your Router and save the Firmware file on your Desktop.
Once you Download the firmware for your Router, Now you need to login to the Router setup page and click on the "Administration" tab and below click on "Firmware Upgrade" and then click on the Browse Button and select the firmware file and click on Upgrade.
Once the firmware is upgraded successfully then you need to Reset your Router and Re-configure all the settings on your Router from scratch.

On a DHCP server with BOOTP enabled. How can I determine what addresses were assigned using BOOTP

We are in the process of migrating our 2008 R2 DHCP servers to Server 2012. We're doing this in order to configure DHCP failover to a remote site. We can't do this if BOOTP is enabled on the scope. Before I start disabling BOOTP on all
of our scopes, I would like to find out what is using BOOTP. Is there a way to search all scopes in the DHCP database to find all addresses assigned using BOOTP. Powershell, netsh?

Hi,
Show BOOTP table:
1. Open DHCP console, expand the DHCP server.
2. Right click IPv4, and select Properties.
3. Switch to General tab, select the checkbox Show the BOOTP tab folder.
After saving the change, you will see BOOTP folder in the left column. Details information you may reference the link:
http://technet.microsoft.com/en-us/library/cc781370(v=WS.10).aspx
Best Regards,
Eve Wang
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact
[email protected]

Can I add a third DHCP server to a WLAN interface?

I'm running a system that requires a third (and potentially fourth) DHCP server to be setup on each network in my network.
The first two devices are Windows DHCP servers serving IPs from different address ranges for failover. The third DHCP is just a listener to receive OS information and device names to be logged in a database.
Currently this works like a charm for my wired clients as I can add in the third and fourth ip helper-address on each vlan and the information is received by the listeners. However, I cannot find anywhere in my WLC5500 to setup these extra two DHCP helper addresses.
The wireless vlan on my layer 3 switch has all the ip helper-addresses, but this doesn't seem to work, and the devices just use the DHCP servers set on the interface in the WLC.
Is this possible?

You can disable dhcp proxy on the wlc (as long as the wlc is not doing dhcp). This way you can set your ip helpers on your L3 interface.
Sent from Cisco Technical Support iPhone App

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

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

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

Can I use ASA to be a DHCP Server use in WLC wireless Client

I want to use ASA to be a DHCP Server for Wireless Client not it can't.
I check the debug log in WLC, I confirm the WLC have send the request to ASA.
In the ASA, it don't have any hits in the rule when the WLC send the DHCP relay request.
I have try don't use dhcp relay in WLC but don't success. Anybody have the same case with me? And Is the ASA can't support DHCP relay agent to request to get the IP Addr.
P.S. In the Network Design limitation so I can't use WLC to be DHCP Server.
Equipment:
ASA5510
WLC4402
How can I fix it.
Thank you very much

The issue is that the ASA doesn't accept DHCP requests from a relay agent, only broadcast DHCP requests. In the 4.2 version for the controllers there is now an option so you can change the way the controller forwards DHCP requests so that it is sent as a broadcast and not from a relay agent.

Can WRT600N DHCP server actually be disabled?

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