Two subnets thru same wire
Ed Greshko
Ed.Greshko at greshko.com
Mon Mar 28 08:03:10 UTC 2005
Shiraz Baig wrote:
> Sir,
> Mr Ed Greshko has reminded me about academic
> questions. I agree with him. But it is not purely an
> academic question, as would be clear from following
> real life situation of my office.
> BTW, I have read, everything about ARP, MAC address
> and how things work on wire. But I thought, I must
> also also ask experts.
>
> Here is the configuration that we have in our office.
> This configuration is also working.
>
> Switch
> _______________
> | | | | |
> | | | | ---- DSL Router ---- Internet
> | | | | 203.147.175.12
> | | | |
> | | | ----------Mail Server (multihomed)
> | | | 203.147.175.13
> | | | 192.168.10.3
> | | |
> | | -------- 192.168.10.4
> | ----------- 192.168.10.5
> ---------------- Hub & computers of address
> 192.168.10.*
>
> You see, there are two class C networks. One is that
> of 203.147.175.0
> The other is 12.168.10.0. Both these networks are
> passing thru same switch.
>
> I just wanted to be sure that there is nothing wrong
> with this configuration. So, I would request your
> comments please.
Things keep changing. No longer is this an "academic exercise" it seems
now to be a "free consulting" exercise. :-)
Your question shouldn't be "can I do this" but "even if I could, should
I do this".
As a practical matter you don't want to do what you've diagramed. At
the very least you'd be better served by:
Switch
_______________
| |
| ---- DSL Router ---- Internet
| 203.147.175.12
|
----------203.147.175.13
|
|
Mail Server & Firewall (multihomed)
|
|
192.168.10.3
|
|
------------
Switch |
_______________|____
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | -------- 192.168.10.4
| ----------- 192.168.10.5
---------------- Hub & computers of address
192.168.10.*
Kindly excuse the poor ASCII art. I was never very good at it.
--
"A common mistake that people make when trying to design something
completely foolproof was to underestimate the ingenuity of complete
fools."
--Ford Prefect in "Mostly Harmless".
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