ADSL eth modem and ISDN serial modem configuration

zedrob · 01-16-2004, 05:24 AM

Hi
In my MDK 9.2 box (standalone Workstation) I want to get at work two different Internet connections:
-ADSL through Ethernet
-ISDN through serial port (PPP)

Note that separately they work as a charm...

But I want to use ADSL only for file transferring and ISDN (less expensive) for mail/web surfing.

I really don't know how to make it...maybe I have to insert different routing rules? Should I use a script to configure one or the other when needed?

I use KPPP for modem control...

I'm totally new to networking...so please be very clear

Thanks and kind regards.

leckie · 01-16-2004, 05:58 AM

I cannot see an easy way of doing this via the routing table, but i am no expert at complex routing configuration.

But i can tell you it is quite possible and relatively simple via squid.
U can specify all kinds of rules including destination address file size and file extension. Then all u have to do is specify how these rules access the Internet.
The down side of this method is all clients will have to go through a squid proxy server.

ummmmm maybe there is another way you can bond the 2 Internet links together and priorities traffic to use ppp0(isdn link). I am not sure if this will work and i know little about it. ??? look it up, i hope someone else has a better solution as i have been wrong.

zedrob · 01-16-2004, 07:07 AM

thanks leckie I'll try...

a friend of mine suggested me to use a script to add to the routing table the default line with the IP of ppp0 (through grep of ifconfig...) I'll try this too tomorrow!

Any other suggestion is more than highly welcome !!!

Thanks again for your help

Bye

leckie · 01-16-2004, 07:20 AM

can u post what your friend said so i can see what he is doing.
thanks

zedrob · 01-16-2004, 07:37 AM

I'll post it when he'll send me the script...
bye

zedrob · 01-19-2004, 07:45 AM

Hi
this is the script my friend sent to me...
Basically it's a way to find IP address after ppp connection and to add the default route line...
Bye

Code:

#!/bin/sh
#
route del default
IPADDRPTP=`LANG= LC_ALL= ifconfig ppp0 | grep 'P-t-P' |
awk -F: '{ print $2 } ' | awk '{ print $1 }'`

route add default gw $IPADDRPTP ppp0

zedrob · 01-19-2004, 08:02 AM

Hi
Now the connection seems to be ok for both ADSL and ISDN as well.
But when I try to send an e-mail (client evolution) with ADSL connection up, I get an error message that sounds like

Quote:

"unable to send mail...no routing to Host - port 25).

I know that the port 25 is the default for SMTP protocol for outgoing mail...how can I open it (i suppose it's closed...)?

Note that when I use ISDN through PPP everything works fine...

Thanks for your help