Is this possible

EdTheLadEdTheLad Member Posts: 2,111 ■■■■□□□□□□
in CCNA & CCENT
At home i have a 10Mb connection to my ISP, fibre to the home.
So the demarc in my apartment is a hub with a firbe interface to the ISP and 4 ethernet ports for me to use.
I got myself a wireless router which is setup purely to bridge between the ISP
hub and my wireless PC's.This is a DSL hub with all functionality realated to
the DSL port so basically all i can use it for is bridging in this environment.

When i connect my PC through the wireless, everything works fine and i receive my IP address through DHCP via the ISP.Now when i connect a second PC this PC will sometimes get its IP address via DHCP and sometimes
it will default to the 169.x.x.x address which is no good for me.Mostly i cant get the two working together and if i do when one restarts it stops working.Anyway this behaviour is very stange and has made me crazy so i ceased using the wireless.

So my question is, can i setup my router to act as a gateway between my PC's and the ISP.My idea would be to have the router connected to the ISP hub via ethernet and receive its IP address dynamically( i.e. can the router be setup to send a dhcp request on its ethernet port, cisco 2600)
I would then connect wireless router to the 2600 and have a PAT on the ethernet port facing the ISP.Since i have no control over the ISP side is it posible to do PAT?
Networking, sometimes i love it, mostly i hate it.Its all about the $$$$
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Comments

  • tunerXtunerX Member Posts: 447 ■■■□□□□□□□
    I would imagine that your ISP is restricting your connection to only one active DHCP address. You can probably add more address to your house for a couple for bucks a month.

    Otherwise, you can setup a router to do NAT for you. You need to make sure that your ISP allows you to register that type of connection. When I was in Korea the cable company restricted connections by using tacacs on your computers. This stopped older routers like linksys, netgear, belkin, and dlink from being able to get an address. Cisco had no problems. If your ISP does not require software to connect to their network then you may not have this problem.
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  • QUIX0TICQUIX0TIC Member Posts: 277
    I would tend to agree with TunerX.

    You can set up your network as a regular setup of ISP connection to ISP's modem then ISP modem to your Linksys/ Cisco router. Perform NAT/PAT on the router. Of course, performing that from the demarc... you will need some type of bridge if the length of cables is not long enough. But, im pretty sure you can only supply that information regarding the physical layout of your home.
    "To realize one's destiny is a person's only obligation."
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  • DrakonblaydeDrakonblayde Member Posts: 542
    Yeah, the way you have it setup now, you've basically got two computers trying to pull a live IP address for each box, and your ISP is restricting your circuit to one DHCP address.

    Only way to get around it is to have something in between your home network and the isp side performing NAT
    = Marcus Drakonblayde
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  • sarfrazsarfraz Member Posts: 4 ■□□□□□□□□□
    I have a 3MB connection from my ISP, and connected three computer to that through a router and everthing works fine. job is done by the router, what it does is PAT (port address translation) and dhcp. see if your router support PAT then it would be easy to configure it, hopefully it will work
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