I have slackware version 7 and I am trying to convert my internet connection from dialup to DSL. I want both dialup and DSL working at the same time, so when my domain name gets re-associated with my new IP address, there will be no interruption in connectivity.

background data:
slackware box = 192.168.1.1 = eth0
192.168.1.100 = Linksys router

Everything works just fine for my dial up static IP connection. This box was my primary gateway for my LAN. I just bought a linksys router to connect to my DSL and now I have that setup for my default gateway for my LAN. I have already begun forwarding ports from my linksys router to my slackware box (for web pages and ftp etc..). Internally, I can either type in my old static IP / domain name OR my new static IP and the router will forward my requests to the slackware box. However, externally if I type in my old static IP / domain name nothing answers. But if I type in my new IP address the slackware box answers. I'm thinking it might be a routing gateway problem, because in my /etc/ppp/ip-up script which originally looked like:

#!/bin/bash
#
# Script which handles the routing issues as necessary for pppd
# Only the link to Newman requires this handling.
#
# When the ppp link comes up, this script is called with the following
# parameters
# $1 the interface name used by pppd (e.g. ppp3)
# $2 the tty device name
# $3 the tty device speed
# $4 the local IP address for the interface
# $5 the remote IP address
# $6 the parameter specified by the 'ipparam' option to pppd
#
/sbin/route add -net 0.0.0.0 gw $5 dev $1
exit 0

I added a new line for another gateway:

#!/bin/bash
#
# Script which handles the routing issues as necessary for pppd
# Only the link to Newman requires this handling.
#
# When the ppp link comes up, this script is called with the following
# parameters
# $1 the interface name used by pppd (e.g. ppp3)
# $2 the tty device name
# $3 the tty device speed
# $4 the local IP address for the interface
# $5 the remote IP address
# $6 the parameter specified by the 'ipparam' option to pppd
#
/sbin/route add -net 0.0.0.0 gw $5 dev $1
/sbin/route add -net 0.0.0.0 gw 192.168.1.100 dev eth0
exit 0

But then the first connection via dialup doesn't work when I externally ping the dialup's IP.

Any suggestions on how I can get the slackware box to accept connections either from the linksys router OR the dialup connection? It seems I can either have one or the other.

Thanks!

I think I figured it out... I changed my /etc/ppp/ip-up file to:

#!/bin/bash
#
# Script which handles the routing issues as necessary for pppd
# Only the link to Newman requires this handling.
#
# When the ppp link comes up, this script is called with the following
# parameters
# $1 the interface name used by pppd (e.g. ppp3)
# $2 the tty device name
# $3 the tty device speed
# $4 the local IP address for the interface
# $5 the remote IP address
# $6 the parameter specified by the 'ipparam' option to pppd
#
/sbin/route add -net 0.0.0.0 gw $5 dev $1
/sbin/route add -host 0.0.0.0 gw 192.168.1.100 eth0
exit 0

Basically I added the line with the -host option. But I don't really understand why it works... If anyone can help me out, I'd appreciate it!