Changing back to dial up after cable w/ static IP

[Nun Yobiznez <exxcomm@rocketmail.com>]

     I just had to end a comfortable situation w/ my
cable modem provider and would like to be able to use
dial up w/ DHCP once again but am a little stymied as
to what I should address for /dev/ttyS0 to be
considered the primary network interface instead of
eth0 for internet. 
     This box was built w/ static IP and can connect
w/ my ISP (dial up) but I think it's still trying to
use it's cable modem IP instead of requesting DHCP to
get an IP from the dial up ISP. I have poured through
the network HOWTO but cannot find how to differentiate
the network interfaces so that I can use my modem for
internet while still keeping LAN capability w/ eth0.
Any help would be appreciated! I am going to focus
some attention at mask situations for this issue next.

                                 

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