RV120W ROUTER/firewall "cannot display the webpage".

I have a small LAN using a T1 of One Communications line.  Static IP address.

30 workstations.  Windows 2003 DHCP server.

Installed new RV-120W firewall router last week replacing an old unit of Netgear.

Configure VPN tunnel on the unit, have remote access for about 10 users.

This part works well.  A little slow, but acceptable.

My question: is internet connectivity on internal LAN in and out.  She's very agitated.

Upload and download speed has been consistent (~2.5M/sec)

External Pings see the very minimal loss.

Users have seem intermittent loss of web streams and corrupt downloads.  web activity 90% is ok, but we continue then getting "cannot display the webpage error."

NSLOOKUP displays the DNS, but occasssionally "TIMEOUT" occurs.

I got the provider perform loopback tests and replace WIC on CISCO 1841 router T1, but I still see the behavior.

I see by reading other forms, that it is an ongoing problem with the routers of RV.

My settings...

Public static IP / DNS on the router.

Reverses the MTU to 1500.  I have adjusted downwards by increment to 1350.

Windows Server 2003 has RV120W address as the router / gateway.

T1 to CISCO 1841 ROUTER... to CISCO RV120W... to LAN CISCO SLM248G interrrupteurs (2).

I do not configure all redirects the port.

I continue the line tests on my end, but as I said this problem was not existing with Netgear unit.

Please indicate any change of setting / suggestions.

Hi Jason et al...

In my view, the technician are now experiencing a UDP on the Rv120W question.

The internal discussions on the issue of R & D and development seems to be;

1. default on RV120W a UDP Flood attack control that limit 25 UDP by customer connections in one case there, IE to a particular instance of time a PC behind the router can establish only 25 UDP Transactions, if we exceed router drops packets UDP.

2. we have a script that sends dns queries to search at a very high pace that the router deletes the entries in the UDP, in this way, that we accumulate the UDP entry in the router table (IE 25 entries)

3. once 25 limit is reached, we are unable to resolve DNS queries, in addition to using the script or by using the browser.

4. in real-world scenarios it could be a PC behind the router and open a website where all the elements on the Web page are related to the different website, if you open this type of Web site, it may have links to over 25 different site and clog the table routers UDP for the PC and the user may not able to solve queries DNS additional and impossible of browse all new Web sites. This inability to browse happens until the UDP entries on the router time dead and are deleted.

5. this limit of 25 is because of the feature called raw block UDP on the router that is enabled by default.

6. once we disable the block UDP Flood, router does not check 25 connections limit UDP and dns resolution is continuous, without interruption.

This is a customers in the area could be to see breaks in the DNS resolutions and browse site failed.

Some customers talked explicitly about DNS failures.

Jason I see that you have placed a service call, so I hope that CCORAL who posted August 15 should be helping you.

So people, if the technician finds the problem not a hardware issue requiring an RMA, the technician will intensify the call for our people of level 2 in the Irvine case, probably CCORAL.  You will get a help to solve this problem.

The small business support center, should be aware of the problem. Please do not hesitate to show them this announcement, I am ready to discuss with them to get things moving.

Yet once, if you have not already done, please contact the HWC and place a request for service and keep a copy of this number they give you as a reference (you can need). My apologies for the inconvenience that you all had.

concerning

Dave Hornstein

Small businesses, channel system engineer

Cisco - Research Triangle Park.  U.S..

http://www.Cisco.com/en/us/support/tsd_cisco_small_business_support_center_contacts.html

Tags: Cisco Support

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