John R Pierce wrote:
> On 04/24/11 11:15 AM, Timothy Murphy wrote:
>>>> Without any information on what the purpose of such a setup would be,
>>>> it's close to impossible to give you any recommendations. Is it
>>>> because you want to use your CentOS system as a firewall? a router? a
>>>> HTTP proxy? a network sniffer?
>> I don't actually think my motives are relevant.
>> In case I didn't described the situation clearly,
>> my CentOS server is connected to an ADSL modem by ethernet (eth0).
>> The modem's IP address is 192.168.1.254 .
>
> your goal is very relevant if youj are expecting us to suggest a
> workable solution.
>
> but ouch, sounds like your modem is ALSO a NAT router, and is probably
> running DHCP already. what IP is eth0 of this linux PC ?
>
> you want to avoid 'double nat' where there's multiple layers of address
> translation as its just ugly as heck to troubleshoot, and adds
> complexity without any additional value..
>
> assuming I'm right, and your modem is in fact doing NAT routing too,
> then I'd put DD-WRT or Tomato opensource firmware on the WRT54GL,
> configure it for LAN only use, so all 5 ports are LAN, plug it into the
> modem, plug your computer(s) into the WRT's switch also, and configure
> the WRT"s wireless. now all your systems will be on that 192.168.1.xxx
> subnet.
He wants to pass all traffic through CentOS box so he can monitor
traffic, run bandwidth shaping, etc..
As for double-NAT, it's not so horrible. I now people using even
triple-NAT without issues. Not recommended, but much easier for noob's
then learning how to route properly. 7 years of experience speaking.
Ljubomir
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