How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask R.A. McConnell Your Own Question

R.A. McConnell
R.A. McConnell, Network Admin
Category: Networking
Satisfied Customers: 757
Experience:  A-Plus, MCP, 18+ years experience, LINUX admin
45119205
Type Your Networking Question Here...
R.A. McConnell is online now
A new question is answered every 9 seconds

I use a Motorola SBG6580 modem gateway, and I have been trying

Resolved Question:

I use a Motorola SBG6580 modem gateway, and I have been trying to find the section in the configuration page which will enable me to bind an ip address to the mac address, but I can't find it. It is probably there, but called something else. Could you please tell me where to find it and how to do it please?
Submitted: 4 years ago.
Category: Networking
Expert:  R.A. McConnell replied 4 years ago.
Hello, I'll be happy to help you with this. Those Motorola cable gateways that can reserve addresses in DHCP access the settings like this:




  1. Login to the web-based configuration utility.


  2. Click on LAN.


  3. Click on dhcp leases.


  4. Enter the IP address and MAC address that you want to pair up together, and provide the computer with a name.


  5. Click Add.




If you don't see the dhcp leases option, you can't reserve them on this model and you'll have to manually assign an IP address outside of the range being distributed by your DHCP server. If you need to do this and would like some help with it, let me know and I'll be happy to lend a hand.
Customer: replied 4 years ago.

The mac address that I bind to the ip address should be the LAN mac address. Is that correct?

The computer already has a lease, but the MAC address is different from the LAN mac address.

Even though DHCP is enabled as per Time Warner's directions, I want the IP address to be unchanged when the lease expires, so I should bind the LAN's mac address to an ip address for the computer to keep the same ip address. Is that correct?

Expert:  R.A. McConnell replied 4 years ago.
Typically a station that receives and address via DHCP will attempt to renew the lease on that address when its expiration time is half up. I assume that you're referring to the IP address of a computer on your home network, and not the address of the Motorola unit itself. Is this correct?
Customer: replied 4 years ago.
I build my own computers and know them inside and out, but networking is not even close to my area of expertise. Maybe you have already figured this out and maybe you haven't, but I am trying to correct a NAT problem on VUZE which is a file sharing program. It says that it is firewalled, and the way to fix this problem is too either disable DHCP (which I can't do) or use the mac adress binding capabilities of the router to assign a specific IP to the netwok card. Hopefully this will clear up exactly what I am trying to do. Thank you for your patience if this takes a while.
Expert:  R.A. McConnell replied 4 years ago.
No problem. Being an expert in one field doesn't necessarily make you an expert in any other. With this in mind, let me repeat what I believe you're trying to do, so that I can make sure that I get you the correct answer:


You have a computer on your local network, connected to the Motorola cable gateway, and you want to allow a computer or computers outside your local network to have access to a file sharing service on it. As such, you need the computer on your local network (which is using a NAT/firewall setup which is controlled by the router, as most computers behind a router do) to have an IP address that does not change, so that you can open the hole through the firewall to allow it to work. Is that correct?
Customer: replied 4 years ago.
I have one desktop computer which is hard wired to the Motorola Cable Gateway. There are no other computers on my network except for 2 laptops that connect wirelessly, but they are usually shut down, so it is only the desktop that I am concerned with being able to send/receive to and from other computers. Actually the firewall in NIS 2010 is configured to allow traffic to and from the VUZE program, and Windows Firewall is turned off. I have also disbaled the firewall in the Motorola too. Yes, I know that sounds like a precarious setp, but NIS 2010 has been very good stopping viruses and unwanted attempts to enter my computer so far. I don't keep super sensitive info on my computer, so I am not that worried.
Expert:  R.A. McConnell replied 4 years ago.
This configuration step is posted as an answer, per site policy, but don't accept it until you're satisfied that it has answered your original question.


An easy way to do this is to set your desktop to use a manual IP address outside of the range that the Motorola box normally distributes, re-enable the firewall on the Motorola box, then set your desktop's IP address as the DMZ. What this does is still allow the Motorola box to control network access (doing otherwise in the modern day is mind-bogglingly dangerous), yet all unsolicited incoming traffic will automatically be sent to your desktop, removing the need to do additional configuration of the Motorola's firewall to allow only some incoming traffic (because you're using NIS to manage the security on the desktop).


Do you know how to check the range of addresses that the DHCP server in the Motorola unit is using? If so, go ahead and check. If not, let me know and I'll be happy to help.
Customer: replied 4 years ago.

The range is 192.168.0.2 to 192.168.0.254. Should I set the ip to lets say 192.168.0.275 first or set the DMZ address to 192.168.0.275? When I try to set the ip to 275 first it says .....

 

Error converting one or more entries:

Possible causes of this error:

1. IP address is already in use by client with another MAC address

2. IP address already exists in the DHCP lease reservation table

3. The IP address is invalid. It must be between 192.168.0.2 and 192.168.0.254

 

When I try to set the DMZ address to 192.168.0.275 it doesn't appear to take it.

There are currently no DHCP clients setup with any MAC address.

Expert:  R.A. McConnell replied 4 years ago.
First, try resetting the DHCP range for 192.168.0.2 through 192.168.0.250 and then assign 192.168.0.251 to your computer (manually). When you are confident that you can browse the web with that IP address, set it as the DMZ (192.168.0.251).


The address 192.168.0.275 is invalid, as the numbers in an IP address can only be zero through 254.
R.A. McConnell, Network Admin
Category: Networking
Satisfied Customers: 757
Experience: A-Plus, MCP, 18+ years experience, LINUX admin
R.A. McConnell and 10 other Networking Specialists are ready to help you
Customer: replied 4 years ago.
It said the starting local address was 192.168.0.2, and there were 253 CPEs. Can I assume that changing the CPEs to 250 was resetting the DHCP range? After I did that I used the LANs mac address and binded it to 192.168.0.251 and it accepted it. I then set the DMZ host to 192.168.0.251 and it accepted that too. I also re-enabled the Motorola firewall too. Does that sound like I did it correctly?
Expert:  R.A. McConnell replied 4 years ago.
That sounds like you did every thing correctly. Excellent job! Since you're on the web, we can verify that this is working. Can you test your VUZE software now? If it's working, then we're probably done. Let me know.
Customer: replied 4 years ago.

Can I get back to you tommorow?

Are you there on saturdays?

If not is it ok if I get back to you on monday?

So far it looks ok with a green NAT light instead of a red one, but I would like to give it a little more time to see if it stays that way. Is that ok?

Expert:  R.A. McConnell replied 4 years ago.
Monday would work better, to be sure. It's pretty unlikely that I'll be in at all on Saturday. Let me know if you have any trouble with this and I'll be happy to help on Monday.
Customer: replied 4 years ago.
Thank you very much for what appears to have solved my problem. I will get back to you on monday.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I am very happy with my very fast response. Eric is very knowledgeable in the subject area. Thank you! RP Austin, TX
< Last | Next >
  • I am very happy with my very fast response. Eric is very knowledgeable in the subject area. Thank you! RP Austin, TX
  • My Expert answered my question promptly and he resolved the issue totally. This is a great service. I am so glad I found it I will definitely use the service again if needed. One Happy Customer New York
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
 
 
 

Meet The Experts:

 
 
 
  • James

    Sr. Network Administrator

    Satisfied Customers:

    1711
    Highly experienced with wireless networks and wireless equipment, LAN and networking protocols
< Last | Next >
  • http://ww2.justanswer.com/uploads/BA/barrenrock/2011-10-19_215925_JamesJAFinal.64x64.jpg James's Avatar

    James

    Sr. Network Administrator

    Satisfied Customers:

    1711
    Highly experienced with wireless networks and wireless equipment, LAN and networking protocols
  • http://ww2.justanswer.com/uploads/Claws224/2009-07-07_063935_Dork_Portrait.JPG Claws224's Avatar

    Claws224

    IEEE Network Engineer

    Satisfied Customers:

    1256
    IEEE, Microsoft
  • http://ww2.justanswer.com/uploads/KN/knelly74/2011-4-14_215651_kevin.64x64.jpg Kevin's Avatar

    Kevin

    LAN/WAN Specialist

    Satisfied Customers:

    1165
    Certified MCSA and MCP Network Administrator with over 20 years of PC experience.
  • http://ww2.justanswer.com/uploads/tealnet/2009-09-26_000218_headshot_64.jpg Eric K.'s Avatar

    Eric K.

    Network Administrator

    Satisfied Customers:

    510
    13 years of desktop, server and network support experience
  • http://ww2.justanswer.com/uploads/CL/clagesolutions/2012-6-27_145545_20120608Geoff.64x64.jpg Mr. Clark's Avatar

    Mr. Clark

    Network Engineer

    Satisfied Customers:

    510
    Computer Business Owner / Former DoD Network Specialist
  • http://ww2.justanswer.com/uploads/MA/matthewpj73/2012-1-20_18729_TWO.64x64.jpg Matthew J's Avatar

    Matthew J

    Computer Support Specialist

    Satisfied Customers:

    397
    12+ yrs computer diagnosis/repair, network infrastructure install and support, IT Administration
  • http://ww2.justanswer.com/uploads/SE/Seashore2011/2011-12-6_33418_111205223015.64x64.jpg Chris L.'s Avatar

    Chris L.

    Support Specialist

    Satisfied Customers:

    384
    Certified Networking expert with over 10 years experience.
 
 
 
Chat Now With A Network Technician
R.A. McConnell
R.A. McConnell
Network Technician
757 Satisfied Customers
A-Plus, MCP, 18+ years experience, LINUX admin