Re: [pptp-devel] solved routing problem!!!!!

[James S. <st...@bt...>]

James Stone wrote:
> James Stone wrote:
> 
>> Ive done it!! (yay)
>>
>> copied table from my win98 setup.
>>
>> Didnt use the script at all, just route command!
>>
>> will post here once I work out what the table is actually doing!
>>
>> James
>>
>>
>>
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> Okay here goes:
> 
> #remote dialup ip= a.b.c.d
> #remote tunnel ip= f.g.h.i
> 
> route add f.g.137.15 gw a.b.c.d dev ppp0
> route add default gw f.g.h.i dev ppp1
> route add -net f.g.h.0 netmask 255.255.255.0 dev ppp1
> route add -net a.0.0.0 gw a.b.c.d netmask 255.0.0.0
> 
> ...and it works!!
> 
> Only trouble is have to do it manually.
> 
> The dialup environment variables are lost before the tunnel script runs. 
>  I am sure there is a way to get around this. Would be grateful if 
> someone can come up with a script!!
> 
> Regards!
> 
> James
> 
> 
> 
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> 

Okay, to get this clear.. this is to route almost everything via the 
tunnel.. there may be an easier way to do it but I havent found it. Also 
I made a serendipidous mistake in copying my routing table from win98 
into Linux.. the line

route add -net a.0.0.0 gw a.b.c.d netmask 255.0.0.0

is not strictly correct but if I change it, the tunnel stops working 
properly.  The f.g.137.15 bit is actually the IP address of the computer 
running the vpn server (i.e. if you try to telnet to it). It is 
different from the local and remote IP which pppd picks up.  Of course 
the numbers may be different from 137.15 on other servers but I didnt 
know that when I worked it out to start with. I have added an extra line 
to my script to allow mail to be routed via the ppp0 interface so it 
still works when the tunnel is connected.

Here is the tunnel up script:

#replace letters with correct values.
#dialup IP (remote) = a.b.c.d
#tunnel IP (remote) = f.g.h.i
#vpnserver IP = f.g.x.y
#mailserver IP = j.k.l.m

#!/bin/sh
if [ "${PPP_IPPARAM}" = "tunnel" ] ; then

route add f.g.x.y dev ppp0
route del default ppp0
route add default dev ${IFNAME}
route add -net a.0.0.0 netmask 255.0.0.0 dev ppp0
route add j.k.l.m dev ppp0

fi

Also need to add a similar script to ip-down.d/tunnel with all the adds 
and dels changed to reset everything.

Regards

James