[cisco-bba] PPPoE with Routed Subnet

[Patrick Wu]

Hi Andy,

The configuration you have suggested would be a typical PPPoE setup, but I'm
faced with a situation where the IP assignment is something like:

Static IP assigned via Service Provider: 203.40.50.61/32
Routed Subnet: 203.40.50.60/29

RADIUS would probably have a Framed-Route attribute of something like
Framed-Route="203.40.50.60/29 203.40.50.61 1"

Meaning the the dialer interface (or bridged interface or whatever that
interface might be) will have .61 and other usable IPs in that subnet will
be used for hosts behind that router.
Any ideas?

Thanks again.

cheers,
Patrick
On Tue, Jan 13, 2009 at 8:03 AM, Andy Saykao <
andy.saykao at staff.netspace.net.au> wrote:

> 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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