At 07:17 PM 8/3/2008, Shin Miyakawa wrote:
oops. Let me correct.
Our Linksys box can assign same address for WAN and LAN interfaces.
But anyway ... Still I am wondering what's happening in this case...
Shin
> Brian, please explain, where does a packet from PC1 for 10.0.0.12 go
> in the following settings ? PC3 ? or CGN ?
Shin,
Assuming
-that I've understood your question, and
-that PC1, 2, & 3 are all in the same subnet...
Unless I am missing something, according to basic host processing, a
packet from PC1 to 10.0.0.12 will be sent directly to PC3 by PC1. The
host processing should look like this:
- PC1 IP stack receives datagram from upper layer, destined for 10.0.0.12
- DST IP in same subnet as local interface
- check local MAC learning table for entry associated with 10.0.0.12.
- If entry, then create frame for that MAC and send frame on segment.
- If no entry, then ARP for 10.0.0.12. Upon receiving MAC
response, create frame for that MAC and send frame on segment.
Did I understand your question?
>
>
> [PC1]-----------+
> 10.0.0.10 |
> |
>
[PC2]-----------+-----------[NAT]--------------------------[CGN]----------------
>
10.0.0.11 | 10.0.0.1 10.0.0.20 10.0.0.12 Global Address
> |
> [PC3]-----------+
> 10.0.0.12
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