[rbak-nsp] reduce MTU in subscriber default / radius

[Florian Lohoff]

On Tue, Jan 29, 2013 at 10:02:44AM -0800, Yuri Shefer wrote:
> Hi,
> 
> How did you checked the Framed-MTU? Under the session it should be applied
> as "ppp mtu".
> 
> subscriber at context1
>         Session state Up
>         Circuit   lg id 5 vlan-id 223:32 pppoe 1
>         Internal Circuit   255/36:1:6/3/2/14014
>         Interface bound loopback3
>         Current port-limit unlimited
>         Session time left 85976
>         Protocol Stack IPV4
>         context-name local (not applied)
>         profile V4_RESIDENTIAL (applied)
> >>>>>        ppp mtu 1400 (applied)

It does apply - But i verified by tcpdump that its not used in LCP
Negotiations - Which is natural when one understands RFC1661.  RADIUS
auth happens AFTER negotiating PPP MRU, so there is no way to reduce the
MTU with RADIUS except renegotation e.g.  resetting the LCP as L2TP
(RFC2661) does ... The Smartedge does not reset the sessions LCP when
LCP Parameters change.

Flo
-- 
Florian Lohoff                                                 f at zz.de
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