2 WRT54G on different subnets off One Satellite IP modem

Discussion in 'Networking Issues' started by WirelessInn, Feb 14, 2007.

  1. WirelessInn

    WirelessInn LI Guru Member

    I have looked through the forum for possible answer - not quite exactly reached!

    I run a HughesNet (Direcway) Sat connection for my business and i am planning to develop a two wireless branch configuration, as follows (one to be for my HomeOffice traffic, the other to be for public use around the business - I want to maintain a certain level of separation between the two areas):

    HughesNet Sat Modem >> switch >> Router 1 on 192.168.1.xx
    HughesNet Modem >> Same switch>> Router 2 on 192.168.2.xx

    I would of course put the routers on different channels - 1 and 11, and maintain different SSID and WPA encryptions between the two routers.

    Possible problem: the physical distance btw the routers will NOT be that great, therefore their broadcasts WILL be overlapping significantly. Will this pose any problem?? I have noticed that wireless devices may sometimes hunt and find better signal in the area they are operating. I would not want that to happen as far as the HomeOffice and Business users are concerned (would be inconvenient for sure)!

    I'll appreciate the suggestions as usual!

    - Roger T
  2. hudr

    hudr LI Guru Member

    I don't think you will have a problem w/ overlap... With 2 SSIDs both network will show up on wireless devices but once you connect to one it should stay on that network.
    possible caveat:
    Do you have enough addresses available on your side of the Sat Modem? I know it depends on the plan, but w/ my HughesNet I think the network between the Modem and the router only allows 2 devices ( 1 address for Modem and 1 for router) but this is from memory since my installation is about 3 years old now. I'll have to check that tonight.
    Also, I wonder what your latency will be like running 2 networks. I notice a significant slowdown in browsing the 'Net when more than 1 pc is accessing my network. But I am on the low price/low bandwidth plan so that is expected.
  3. WirelessInn

    WirelessInn LI Guru Member

    Interesting thought, hudr.
    I also have the cheap plan - works surprizingly well however, considering latency, crowdiness of Sat traffic in the evening especially (man, the b'width drops a lot in peak hours, but is still MUCH better than my previous dialup!!). I have been thinking of upgrading to the Static address plan - to facilitate such things as access to my computers via pcAnywhere (I use GoToMyPc for that now) and perhaps even VPN access.
    RE: our remark and question. 1 or 2 addresses dished out by the SatModem? I am wondering if there is such a limitation: after all, if you connect the SatModem to a switch and in then out to xx computers, seems that the DW7000 is supposed to handle IP addresses to all those computers downstream, right??
    Interesting point though!
    - rt
  4. hudr

    hudr LI Guru Member

    OK, I am at home and looking at my Dw7000 modem. It has an address of on my side w/ a subnet. My WAN interface on my router has an address of so....... That would lead me to believe there are more than 2 addresses available on the "WAN" side of your router. I don't have time tonight to test that but it looks valid. I don't remember it being this way when my system was installed nearly 3 years ago but then again I have a mind like a steel trap... rusty, unreliable and illegal in several states ;-)
    So I say go for it. Worst that can happen is it either doesn't work, or you bump the fair access policy on a regular basis.
  5. WirelessInn

    WirelessInn LI Guru Member

    Yeah, hudr, an interesting quest, i.e. seeing how many IPs the DW can dish out. I would still say somewhere between a fair number and a lot. Simply because it is safe to assume that HughesNet has planned for the fact that several computers might end up being connected to a DW. Even on a mere household basis.
    Thanks for the not-so-rusty musings!
    - Roger T
  6. HennieM

    HennieM Network Guru Member

    Provided that you can get 2 IPs from your service provider for 2 WAN connections, you headache will be on the LAN side. If you want to put both WAN/modem connections into the same switch, you will have to look at virtual networks. The switch will not natively handle traffic for AND for, as it will not know which PC/device is on which network, so what should be router to what WAN connection.

    This is discussed pretty extensively here http://www.linksysinfo.org/forums/showthread.php?t=51082

    To keep wireless clients of router1 off router2, just use different passkeys on the 2 routers.

    If you want to maintain complete seperation between the 2 networks, the easiest and most secure solution is to physically have 2 of everything. i.e.

    Net1: modem1 -- switch1 -- router1 -- PCs_on_Net1
    Net2: modem2 -- switch2 -- router2 -- PCs_on_Net2

    With virtual networks, you can duplicate the above setup "logically", as opposed to physically, but then your switch must allow for virtual network configuring.
  7. WirelessInn

    WirelessInn LI Guru Member

    Greetings (again) HennieM. I believe we have already corresponded a lot. The Attached graphics shall look familiar indeed. Your above link gives me reason to study some more (yet arcane to me) stuff. As to the "virtual network" concept, same thing!

    I have however finally - thanks to you and many other patient/knowledgeable folks here and at some other forums - started to understand the reality of WAN/LAN side IP addressing, as well as the meaning/use of gateways. I am still hazy re: DNS however - besides those other topics you suggested in your above reply! Also, I still am not sure about HOW MANY IPs are handed out from my HughesNet Sat modem, which this thread is exploring.

    I have arrived at two configurations, under the tutelage of several forum experts:
    1... The attached DualModemLayout _1_comp.jpg outlines a SWITCHED config for my two wireless routers. It is a stright fwd configuration, whereby wireless users' comps in my BLDGs A and B point to their respective routers, which in turn point to the internal IP of the SatModem ( I am of course assigning Channels 1 and 11 to the routers, as well as appropriate encryption (WEP/for the "public" side: "welcometotheinn" - WPA2/stronger/for the "private"side: some cryptic series of characters)
    2... The other graphic - DualModemLayout_2_comp.jpg outlines a SWITCHLESS config for my 2 routers, i.e. a piggybacking scheme. The SatModem hands out a IP to Router 1 which is turns DHCPs IPs to BLDG B users ("public" side) - Then, Router 2, piggybacking off Router 1, is assigned a Static address in the range of Router 1 DHCP addresses. Then, Router 2 hands out IPs to BLDG a ("private" side) HomeOffice users in a separate range of IPs. Again, Router 2's gateway points to the local address of Router 1, while HomeOffice's user point to the local address of Router 2.

    I know, I know: there must be some glitches - still - in there. I'll appreciate input & corrections. What I am trying is to set up a limited "hotspot" of sorts for my Inn's Guests, while maintaining privacy for HomeOffice, all without getting into complex hotspot configuration. In both setups, I maintain encryption for the "public" side, since I do not want to have a really wide open public access to my wireless setup.

    Thanks for anything and everything!

    - Roger T

    Attached Files:

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