Re: strange userland pppoe behavior after replacing a v3.4 gateway with v3.7

[Andre Ruppert <ar_(_at_)_vision-net_(_dot_)_de>]

Am Mon, 22 Aug 2005 15:24:40 +0200
Ivo Dijkhuis <id_(_at_)_sentia_(_dot_)_nl> schrieben Sie:

> Andre Ruppert wrote:
> > Hello to the list...
> > 
> > The problem: a long time running stable v3.4 OBSD VPN gateway
> > running behind a (german) SDSL line was replaced with a gateway
> > version 3.7(stable).
> > 
> > Now I got ppp mtu problems and can't see why.
> > Most config-files were just copied from v3.4, the ppp.conf file
> > didn't change:
> > 
> > #############################################
> > default:
> >  set log all -sync -physical -tcp/ip -DNS
> >  set redial 10 0
> >  set reconnect 10 2000000000
> >  set timeout 0
> >  set device "!/usr/sbin/pppoe -vvvv -i xl0"
> >  set speed sync
> >  disable acfcomp protocomp ipv6cp
> >  deny acfcomp
> >  set ifaddr 10.0.0.1/0 10.0.0.2/0
> >  enable  mssfixup
> >  accept lqr
> > 
> > connect:
> >  set authname "kjfvkjfdkjdfgkj"
> >  set authkey "jfhkfhfjhfvjkhfk"
> >  set mtu max 1416
> >  set mru max 1416
> >  add! default HISADDR
> > ##############################################
> > 
> > 
> > pppoe (v3.7) is still userland.
> > Don't ask why mtu is 1416 - all traffic is sent through an l2tp
> > tunnel too, so it's a "must". ;-)
> > 
> > Both sides are running OBSD VPN gateways (ipsec/ISAKMPD).
> > Remote gateway is always a v3.4 version.
> > 
> > With v3.7 I got ppp log messages:
> > tun0: Error: ip_Input: deflink: wrote 1452, got Message too long....
> 
> I don't use ppp, but I've seen similar MTU problems with IPsec
> traffic. Using scrub on the enc in pf.conf did solve this problem.
> 
> Maybe you can try something like :
> 
> scrub in  on tun0 all no-df max-mss 1416
> scrub out on tun0 all no-df max-mss 1416
> 
> 
> Regards,
> 
> Ivo
> 
Thanks f|r the hint,
tried it yesterday - nope! ;-)

Still the same error message...

I will replace the v3.7-stable with a v3.6-stable  and have a look.
I'll post the results...

Greetings  

Andre Ruppert