[cisco-bba] PPPoE with Routed Subnet

[Andy Saykao]

It's a pretty straight forward set up.

Eg: 
203.10.20.30/32 (Static IP assigned via Service Provider)
203.40.50.60/29 (Routed subnet)

On your Ethernet or FastE interface:

interface Ethernet0
 ip address 203.40.50.61 255.255.255.248

All your devices on that LAN segment will use 203.40.50.61 as their
gateway. This is the typical set up if your devices on the LAN side are
using IP's from the routed subnet. Eg: web server 203.40.50.62, mail
server 203.40.50.63, etc

For your local PC's are using private IP's (eg: 192.168.1.0/24), you can
use the same ethernet interface and add in a secondary IP address to act
as the gateway for the local PC's.

interface Ethernet0
 ip address 203.40.50.61 255.255.255.248
 ip address 192.168.1.1 255.255.255.0 secondary
 ip nat inside

Because you have atleast 6 IP's to use from your routed subnet
(203.40.50.61-66), you can also use static nat so that your local PC's
might go out to the Internet with a public IP from your routed subnet
instead of the PPPoE assigned IP.

HTH.

Cheers.

Andy

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