Re: Determining IP information for eth0 failed

[Keven Ring <keven mitre org>]

Jeroen Van Goey wrote:

> I'm not sure it's relevant, but when the fibrecable from the ISP comes into my house, it
> goes to a switch> From there one cable goes to a Windows PC, and one to an
> ex-Windows-now-Limux PC (mine, the one with troubles)> 
>
>       printer 
>      / 
> pc1 (windows) 
>   \ 
>    \ 
>  Switch/hub--------cablemodem-----fibrecable-------myISP---------Internet 
>    / 
>   / 
> pc2 (Linux) 
>
> I mention this, because I was thinking that I should search the solution into
> masquarading, gateways, etc. 
>
>  
Is the switch/hub [pick one, they are different.... :) ] really a 
CableModem/DSL ROUTER [that is, on the original box, did it say either 
Cable Modem Router or DSL Router, or both?].
Is PC1 getting an IP address from your ISP?
How many leases have you purchased from your ISP?
Did you purchase the cable modem?

The reason for asking these questions:

1) The switches and hubs that I have seen will not do Network Address 
Translation [NAT].  However, Routers do.
2) If you only have 1 lease purchased from your ISP, why would you 
expect them to give you 2 addresses [assuming PC1 works]?
3) The cable modems that I have seen that are owned by the ISP [that is, 
you lease the cable modem] allow for exactly 1 network card MAC 
address.  If PC1 works, then the cable modem may completely IGNORE other 
requests [which is what appears to be happening].

If you really do have a network switch or hub, then you have two options:
1) Purchase a CableModem/DSL Router (~$50-60 US), and let the switch 
collect dust, reset your cablemodem.
2) Purchase a 2nd Network Interface Card [NIC] (~$10-20 US) for either 
PC1 or PC2, connect the cablemodem to the machine that has 2 network 
cards [either card will do], connect the other card to your switch/hub, 
set up NAT, Install a Firewall, possibly reset your cablemodem.

Personally, I went with option 2, but then, it taught me a lot about 
networking, firewalls, etc.  Option 1 is great for people who just want 
the thing to work.  If you go with option 2, I would recommend putting 
the 2nd network card into PC2, since it is running Linux, and this is a 
Fedora List....

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