[Coco] OT: Networking problem

[David Hazelton]

Not to ask a stupid question, but Does your ISP allow their DSL Modem to 
have multiple IPs.
Working for Comcast, the cable modem only passes 1 IP.  so what you are 
doing is not possible by going off the dsl modem.



On 11/26/2012 6:59 PM, Aaron Banerjee wrote:
> This is a little off-topic, but is something people here probably have 
> more experience with than I do.
>
> I'm trying to "partition" off my network into multiple networks (e.g. 
> for experimental purposes/parental control/etc).  I have a DSL modem 
> and a router.  I thought the following configuration would work, but 
> it doesn't.
>
>
>                       ----
>                       |   | <--------------------------> {other device 
> with static 192.168.1.n IP}
> {internet}  <-------> |   |   "1.2.168.1.x" network
>                       |   |    static IPs                ----
>                       |   | <--------------------------> | R |  
> "192.168.0.y" network (using DCHP from router)
>                       ----                               | O |
>                    DSL Modem                             | U | 
> <------------> device 1
>                   192.168.1.1                            | T | 
> <------------> device 2
>                                                          | E | 
> <------------> device 3
>                                                          | R |
>                                                          ----
>                                             192.168.1.101 / 192.168.0.1
>                                                    netmask 255.255.0.0
>
> Sorry about the '80s era graphics, but I didn't want to have to attach 
> a file -- and besides, I'm from the '80s era (at least when it comes 
> to computers).
>
> 1.  I'd like to have the device 1,2,3 be able to "ping" or summarily 
> see the modem.  I think this should work, but it doesn't.  What did I 
> do wrong (or not do right)?
>
> The router's address to its clients is 192.168.0.1.  It is statically 
> set to 192.168.1.101 for purposes of the modem (which doesn't use 
> DCHP).  The router then uses its own DCHP to doll out addresses to its 
> client as it sees fit (in particular it starts with .100).
>
> For experimental purposes, I took down the firewall completely in 
> order to eliminate that as a source of the problem.  I'm getting a "no 
> route to host" when I ping 192.168.1.1 from the devices on the "0" net 
> (e.g. device 1, 2, or 3).  I don't have "ping" blocked at the modem or 
> router just for good measure, and don't think I'm masking out the 
> "1".  Even a few desperado attempts using DMZs didn't work, and 
> eventually messed up my network until I could undo all that I had done.
>
> I'm obviously missing something very simple and elementary and will 
> probably kick myself when someone points it out to me.  I just haven't 
> done this type of thing in a long while.
>
> Thanks in advance for your help.
>
> - Aaron
>
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