[cisco-bba] PPPoE with Routed Subnet

[Andy Saykao]

You could probably set up your ethernet interface to use the IP assigned
to the dialer interface with "ip unnumbered dialer0" and still have the
private IP as secondary.
 
interface Ethernet0
 ip unnumbered dialer 0
 ip address 192.168.1.1 255.255.255.0 secondary
 ip nat inside
 
Thats what comes to mind now :)
 
Cheers.
 
Andy

 

 

________________________________

From: Patrick Wu [mailto:pwu828 at gmail.com] 
Sent: Tuesday, 13 January 2009 9:49 AM
To: Andy Saykao
Cc: cisco-bba at puck.nether.net
Subject: Re: [cisco-bba] PPPoE with Routed Subnet


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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