RV120W DHCP issue

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Feb 12th, 2012
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I have RV120W router with fw or (both version are affected) and few workstations with Windows 7 (32 and 64 bit). There is common gigabit switch between router and workstations. The problem is that all workstations wait for about 1 minute to get DHCP address from router (on startup and when disable-enable network interface). It seems that when router is restarted eg., workstations (which keep previously attached IP addresses - their network interfaces are still up conected to switch ...) are registered in router´s "Available LAN Hosts" list with "static" IP address mark. When you disable network interface on PC now and enable it again, you have to wait for 1 minute to get network interface up with IP address. Only when you use "ipconfig /release" and "ipconfig /renew" IP address is aquired immediately and registered as "Dynamic" within router "Available LAN Hosts" list - until you restart the router. Then devices are registered as "Static" again. This issue occurs only when there is a switch between router and Windows 7 device which keeps device´s NIC up even when router is restarting or down and/or when devices are already registered as "static" within RV120W. I made many tests with RVS4000, WRV200, ZyWALL 5 and others and mentioned case belongs only to RV120W.

Does upcoming new firmware solve this issue?

EDIT: FW does not have this problem!

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jasbryan Thu, 03/01/2012 - 08:47
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Contact Cisco Small Business Support Center and open a support case and present all your evidence so we can start trouble shooting . SUPPORT NUMBERS


davidagu Sat, 04/14/2012 - 21:32
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Hello abudef000,

Quick Answer: Enable UPnP on the RV120W. This also applies to the new RV180W. This can be done under Administration>Discovery.

When a Windows 7 computer connects to the network, it attempts to use SSDP in order to discoverer available services on the network. SSDP requests are accepted by UPnP. If UPnP is disabled on the router, the Windows 7 client will continue to request its confiugration from UPnP, and continue to get no response. After some time, SSDP will give up, and the Windows 7 client will accept the DORA process from the router.

A packet capture of a Windows 7 PC connecting to a RV120W or RV180W not running UPnP will show mutliple SSDP requests before the client finally accepts the DHCP process from the router. This accounts for the delay in the acquistion of network information. Neither Mac nor Linux clients experince this behavior.

More information: http://en.wikipedia.org/wiki/Simple_Service_Discovery_Protocol

abudef000 Sun, 04/15/2012 - 14:26
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Hi David,

I´m sorry, but on RV120W UPnP has no effect! Router behaves exactly the same even if UPnP is enabled.

davidagu Sun, 04/15/2012 - 14:51
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Hello abudef000,

I will be testing this issue further. Any findings will be posted shortly.

abudef000 Sun, 04/15/2012 - 15:43
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It would be interesting to focus on the differences between DHCP (open)sources in firmware and


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