open port

Posted on 2013-02-07
Last Modified: 2013-02-08
I have my ip providers router which is and i have my dlink dir855 plugged into that with and then its dishing out ips to my various networked gear.

How do I open a port in that situation adding it to the dir855 still leaves it closed and i am not sure what to do now.

Question by:PeterBaileyUk
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 6
  • 2
  • 2
  • +3

Expert Comment

ID: 38863047
Why do you have 2 routers?


Author Comment

ID: 38863059
the cable coming in is optical and i had no say in what they gave. unless you can advise of something i can buy to remedy this. when i bought the dir virgin in the uk just gave a device with a rj45 but not a router.

Author Comment

ID: 38863062
they gave a netgear residential gateway cg3100d-rg
Webinar June 1st - Attacking Ransomware  

The global cyberattack that corrupted hundreds of thousands of computer systems on May 12th had a face, name, & price tag that we’ve seen all too often in recent years: Ransomware. With the stakes – and costs – of a ransomware attack higher than ever, is your business prepared ?

LVL 83

Accepted Solution

Dave Baldwin earned 167 total points
ID: 38863065
If you have two routers on the same network segment, you are almost guaranteed to have problems that can't be resolved.  There are three private network segments as shown on this page:  I put my wireless router on so it wouldn't interfere with my wired network on  .

Since the routers are in series, one connected to the other, you would have to open the port in both of them for it to work.
LVL 21

Assisted Solution

CompProbSolv earned 167 total points
ID: 38863082
I am guessing that you have the DIR-815 to add wireless to your network.  If this is the reason, there is a better way (actually, several).  Here's one:

Set the LAN address on your DIR-855 to (I am assuming nothing is using that)
Set the WAN address to an unused private subnet ( would work)
Disable DHCP on the DIR-815
Enable DHCP on the first router
Disconnect (at the DIR-815) the cable that (probably) runs from the first router to the WAN/Internet port on the DIR-815 and reconnect it to one of the four LAN ports on the DIR-815.
Put a piece of tape over the WAN/Internet port on the DIR-815 so no one is tempted to "correct" the wiring and move the cable there.

After the change, your DIR-855 will no longer be used as a router.  It will have its LAN side connected to the LAN side of the first router and all devices should be on the 192.168.0.x network.  If you need to do any port forwarding, that would be done on the first router.

Author Comment

ID: 38863093
its a dir855 (2nd in chain and the netgear (router 1) is on
LVL 21

Expert Comment

ID: 38863113
Then my numbers are incorrect.  Change all of my 192.168.0.x addresses to 192.168.1.x and where I said DIR-815 change it to DIR-855.

Author Comment

ID: 38863438
is there a decent router i can purchase that will overcome this problem, i always chose dlink as i thought the quality was good. the ones that come with the ip providers are usually cheap crappy things.
LVL 44

Assisted Solution

Darr247 earned 166 total points
ID: 38864718
> the ones that come with the ip providers are usually cheap crappy things.

Actually, they tend to offer modem/routers that result in the fewest service/support calls possible.

What is it you're trying to do, exactly?
You say you're trying to open a port, but neither one of those routers 'block' any ports by default.

Attached is the manual for the CG3100D (it has wireless built in, by the way).

Author Comment

ID: 38867629
ok router 1 the outer router asks for the port number but it only allows me to enter the ip within its range and of course the destination range is outside of that range.

router one wants 192.168.1. 02 to whatever

the inner router of course is 192.168.2 to whatever
LVL 44

Expert Comment

ID: 38868095
Again, what is it you're trying to do, exactly?
LVL 24

Expert Comment

ID: 38868782
Sounds like you are trying to bounce through 2 routers to the inside network, which seems mad to me to be honest...that's 2 NAT translations as well...

@CompProbSolv's solution means you are using the DLink as a switch thus taking the DLink out of the equation really...will work for sure, but I'm in the same thought process as @Darr247 - what exactly are you trying to achieve here? Sounds like you do have access to the providers router and thus should be able to make port forwarding work, why introduce a 2nd router into the mix - it just complicates the setup

Can you explain more of that you are aiming for here? If its just that you like the Dlink model and are familiar with it, adding it into the loop behind an existing router is no advantage - since you need to do all the NAT and port forwarding/opening on the first router in any case, thus adding a 2nd router gives more issues...

Author Closing Comment

ID: 38870584
any suggestions for an alternative router, would be welcome, obviously one that i can connect to the coaxial input.

then i will ditch the netgear and my existing dlink.

i would buy from amazon uk

Featured Post

Visualize your virtual and backup environments

Create well-organized and polished visualizations of your virtual and backup environments when planning VMware vSphere, Microsoft Hyper-V or Veeam deployments. It helps you to gain better visibility and valuable business insights.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
SPAM and Ransomware and Backup 11 141
Network Switches Keep Failing 8 115
Monitoring solutions 8 110
Network Bandwidth Monitoring tool for Virtual Offices 10 126
Outsource Your Fax Infrastructure to the Cloud (And come out looking like an IT Hero!) Relative to the many demands on today’s IT teams, spending capital, time and resources to maintain physical fax servers and infrastructure is not a high priority.
Use of TCL script on Cisco devices:  - create file and merge it with running configuration to apply configuration changes
Here's a very brief overview of the methods PRTG Network Monitor ( offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor ( If you're interested in additional methods for monitoring bandwidt…

751 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