[cisco-nas] PPPOE w/ Radius specified IP & subnet mask problems

[Aaron Leonard]

The netmask is not a standard part of IPCP, but a Cisco
extension, and afaik is used only by Cisco CPE.  Which would
explain why the non-Cisco CPE is ignoring it.

This is documented here: http://www.cisco.com/en/US/docs/ios/12_1t/12_1t5/feature/guide/dtpppsub.html .

The idea of the netmask btw is for CPE that is serving
up a chunk of address space ... so the central router
tells the CPE what chunk of space it got, then the CPE
can serve that up as a DHCP pool.  That's the idea.

Aaron

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On 1/23/2010 10:51 AM, gert at greenie.muc.de (Gert Doering) wrote:
> Hi,
> 
> On Fri, Jan 22, 2010 at 04:11:38PM -0800, Aaron Seelye wrote:
>> Ok, here it is, quite a bit there.  You can see in the radius debug that 
>> both IP and netmask are specified, but for some reason the netmask isn't 
>> applied.  I've tried setting the ppp ipcp mask to reject, request, hard 
>> set, and off, nothing changes, same /8 mask.
> 
> Basic PPP IPCP isn't negotiating a netmask at all.  It's just "this is my
> IP address, this is your address".
> 
> (And even if it did, it would not change anything - so what would the
> remote end do with a /8 netmask?  "sent the packet over the link in
> question".  Well.  Which is exactly what is needed to get the packet 
> to you - "send the packet over the link"...)
> 
> Something weird is going on in this Westell device.
> 
> gert
> 
> 
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