How to disable DHCP Server on a Cisco SRP527W

Posted on 2011-10-23
Last Modified: 2012-05-12
I am in the process of changing ISP for our site. Our server is an SBS 2003 box and provides DHCP for the network. Our current ADSL connection (through our existing ISP) is via a Netgear Modem/Router and the web interface has a control button to turn the DHCP server on or off. Nice and easy.
The new ISP has provided a Cisco SRP527W modem/router and I can't successfully turn off its DHCP server.
I've had the new ADSL connection put onto a different phone line so I currently have both services working. The SBS and the network is still using the old service through the Netgear device. If I connect a PC to the new Cisco router I can connect to the Internet no problems on the new ADSL connection. But I need to turn off DHCP in the Cisco device before I use it for the main network and the SBS.
The CISCO device has a DHCP Server set up in it and then a VLAN using the DHCP server. I can't delete the DHCP server because it says a VLAN is currently using it.
If I try to delete the VLAN, I lose access to the router. I can no longer see the router through the gui, I can't even ping the router.
I've tried changing the VLAN setting from 'DHCP server' to 'Static' and to 'Dynamic'. Either way I still have the same result - I lose access to the router. I even set the Cisco router's IP address to an unused IP in the SBS's subnet, and connected it to the main network, with the VLAN set to 'Dynamic'. The theory was that the router would be dymanically given IP addresses from the SBS for each of its ports. I connected a PC to the router as well as the router to the main network. The PC got IP issued from the DHCP of the SBS through the router's switch, but I still can't talk to the router.
So, at this point I don't think I can use the Cisco router because I can't disable the DHCP successfully.
I cannot believe that it can be this hard to configure!
Does anyone out there no how to disable the DHCP server on this router?
Question by:gregmiller4it
    LVL 5

    Accepted Solution

    go to the vlam setting page and remove the DHCP server connected to it, see options below.

    Address Type Address type determines the way in which the VLAN IP
    interface is configured.
    • Choose None if an IP interface is not required. This would
    typically be the case when bridging ports only.
    • Choose Static IP Address to manually define an address
    for the interface.
    • Choose Dynamic IP Address to request an address from
    a DHCP server on the local network.
    • Choose DHCP server to enable a previously configured
    DHCP Server service on this interface. In this case, the
    VLAN IP address will be derived from the DHCP Server
    LVL 2

    Expert Comment

    try command: no service dhcp

    Author Closing Comment

    Thankyou for your response, but I had already read the page from the manual that you copied into your response. However, it did prompt me to revisit that section in the Router config and I basically had to still work it out for myself.
    The way forward, in the end, was to choose 'Static IP' and set the IP address to be the same as the LAN IP address for the router. There is nowhere that I could find that told me to do that, but I tried it and it appears to work.
    Since your post did encourage me to revist ground I had already covered and I managed to sort it out myself from there, I have given you the benefit of the doubt and awarded the points.

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