Solved

All ports are closed in my Linksys RV042 router-How to enable them?

Posted on 2008-06-24
14
1,059 Views
Last Modified: 2008-06-26
Hi. I've been spending days to find a solution for this.

After we upgraded from DSL to T1(although this might not be a direct cause..), all ports in Linksys RV042 are not working for remote access from outside, for example port 5631 for pcAnywhere and 3389 for RDP. The router has the exactly same setting as before. The only addition from previous DSL is a CISCO 1841 router that sends WAN line to the RV042. (CISCO 1841  is an ATT managed router, which means I don't have access to it). RV042 works as a DHCP server for Win 2003 server with active directory.

I even directly single-connected RV042 to our Win 2003 server, and tried telnet -> open 192.168.1.1 in CMD, but connection fails. I first need to enable 5631 for pcAnywhere and eventually 443 for quickVPN as soon as possible. I don't understand why port 5631 which had been working for years stopped working suddenly. Would the new IP address or DNS from T1 be a source of the problem?
Any comment would be welcomed. Thanks.
0
Comment
Question by:ychousa
  • 8
  • 6
14 Comments
 
LVL 11

Accepted Solution

by:
rowansmith earned 200 total points
ID: 21859315
So do you have this:

Internet <-> T1 <-> Cisco 1841 <-> Ethernet <-> RV042 <-> LAN

If so, what is the IP address that your 1841 is assigned by your ISP?  What IP Address does your RV042 get?

When you visit whatismyip.com from a device on the Internal LAN what IP Address does it show?  The one on the Cisco 1841 or the one on the RV042?

-Rowan
0
 

Author Comment

by:ychousa
ID: 21859404
Hi. The IP address is the one that is on RV042. The serial IP on 1841 is a totally different one. I can ping the 2 IPs successfully.
0
 
LVL 11

Expert Comment

by:rowansmith
ID: 21859492
Do you have an ethernet connection between the 1841 and the Rv042?

It sounds to me like your Cisco1841 is not configured to route packets to the Rv042.

Could you please post the config for the 1841?
0
 

Author Comment

by:ychousa
ID: 21859818
That was what I had thought until I directly connected RV042 to Win 2003 server without internet and 1841, which turned out to be no success. By "No success," I mean telnet -> open 192.168.1.1 -> connection failed - I'm not an expert, so I assume I can say "no success" with that result. If I'm wrong or if there's another way to test, please let me know.

As I said, I don't have access to 1841-it's all managed by ATT(Service provider), so I can't post config for 1841.
0
 
LVL 11

Expert Comment

by:rowansmith
ID: 21859898
Why would you be telnetting to 192.168.1.1?  That is not the address you would be telnetting to from the Internet is it?

Is your connection between the 1841 and the RV042 Ethernet?
NB: This is important please answer this time as it give me some direction to troubleshoot.

On a side note you can get the config out of the 1841 if you have a console cable, we can go over this later if we want to isolate the problem to the 1841 so that you can tell your provider what you need changed on the 1841...
0
 

Author Comment

by:ychousa
ID: 21859946
Yes, it's CAT5 ethernet. And telnetting to the WAN address on RV042 or 1841 doesn't work.
0
 
LVL 11

Expert Comment

by:rowansmith
ID: 21860251
Ok, you need to do some network analysis on the ethernet segment between the RV042 and the 1841.

To do this you need to dig out an old Hub from somewhere and put this in line so you have:

Cisco 1841 <-- Hub --> RV042

Now you need to get another computer and attach this to the Hub.  On that computer you need to install Wireshark (www.wireshark.org).

Run Wire shark and set it to capture packets on the Ethernet interface.  Then from some remote location attempt to make a connection to your network on the appropriate ports and IP address.  If the traffic is getting past the 1841 then you will see it on the wire and you'll know it is the RV042 that has the probelm, if it is not getting past the 1841 then you will see nothing.

Make sure you use a Hub and NOT a switch.

-Rowan
0
Highfive Gives IT Their Time Back

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

 
LVL 11

Expert Comment

by:rowansmith
ID: 21860260
The alternative is that I explain to you how to take the 1841 off line and extract the config from it.  Your provider will never even know .. they will just know that your box has gone offline while it is disconnected from their network....

then we can make sure that it is configured to pass the traffic inbound.
0
 

Author Comment

by:ychousa
ID: 21860428
Hmm.. this might sound silly, but I honestly don't know the difference between a hub and a switch :-) Still, I belive all I have is switch. That makes me choose the second option, right? Could you explain more detail about the second option? Can I use Win 2003 server for testing connection?
0
 
LVL 11

Expert Comment

by:rowansmith
ID: 21860902
Can you make one of these?

http://www.snort.org/docs/tap/

Failing that, you need to attach a console cable to the Cisco as a first step and set your console to 8N1 9600bps
0
 
LVL 11

Expert Comment

by:rowansmith
ID: 21860925
If it says switch on the front of it then it is almost certainly not a Hub.  If it does Full Duplex then it is a switch.

You can use a good quality switch - such as a Cisco switch which can support port mirroring?  ... do you have one of these?
0
 

Author Comment

by:ychousa
ID: 21861568
Hi, rowansmith. I've managed to fix port 3389 and 5631. I don't know what went wrong, but combination of several tries such as reset, rebooting, and changing forwarding options has fixed it, EXCEPT port 443 for quickVPN. That port is still not open, and I think I need to focus specifically on that port.

[Quote/]**********************************************
Can you make one of these?

http://www.snort.org/docs/tap/

Failing that, you need to attach a console cable to the Cisco as a first step and set your console to 8N1 9600bps
*****************************************************[/Quote]
Sorry, but I don't think I can make it. I honestly don't understand your last sentence, either. If it's OK to use a switch instead of a hub, then I'll probably go for the first option, though I'm not sure if the problem of quickVPN is from the port 443 issue. Because it seems there are lots of issues with Linksys quickVPN connection.
0
 
LVL 11

Expert Comment

by:rowansmith
ID: 21861626
Dosn't sound like it anymore, I would start looking at the configuration on your Linksys, is it the same as the other settings?
0
 

Author Comment

by:ychousa
ID: 21877460
Hi, rowansmith. I couldn't have time yesterday due to an emergency. Even though you haven't had a chance to completely resolve the problem, I will give you the total points for your time and effort. I think configuring Linksys VPN is a different subject, so I will post any question later on. Once again, thank you.
0

Featured Post

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Join & Write a Comment

Let’s list some of the technologies that enable smooth teleworking. 
I recently attended Cisco Live! in Las Vegas, a conference that boasted over 28,000 techies in attendance, and a week of hands-on learning hosted by a solid partner with which Concerto goes to market.  Every year, Cisco displays cutting-edge technol…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're interested in additional methods for monitoring bandwidt…

747 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now