gosh darn sharing of DSL with a router/modem: simple how questions

gshanemiller_at_comcast.net
Date: 03/08/04 

Date: 7 Mar 2004 21:02:22 -0800

hi,

i have two unix boxes behind a router which is currently
connected to a cable modem. i nailed down the setup on this
in about 1hr. and it works fine both inside our office and
out to the net. we have shared internet connections, IP
printing, a nice local LAN etc. etc. etc.

DSL modems and PPP is another matter. My chief complaint
is that how-tos start bottom up and explain how to configure
tiny-tiny details like the pap-secrets file and details about
pppd without explaining the basic architecture of the network.
heck, what are the basics for netmasks, IP addresses, both
for the eth0, ppp0, and router? can somebody do that here?

here is what I think is right (but does not work :)

Linksys DSL modem/router
           WAN connect mode: static, manual IP address
                             class B as assigned by ISP
                             in my case 64.xxx.xxx.xxx
                  Netmask : 255.255.0.0 i.e. not 255.255.255.0
                  DNS : as assigned by ISP
                  Prim. GW : as assigned by ISP
           LAN parameters
                           : static class C IP address 192.168.1.1
                           : netmask 255.255.255.0

MacOS box: eth0: static class C IP 192.168.1.100
                 netmask 255.255.255.0
           ppp0: static class C IP 192.168.1.101
                 netmask: 255.255.255.0
                 username: per ISP assignment
                 password: per self assignment
           routing:
                 there is, somehow, a static route
                 entry which guides network traffic
                 i.e. non-192.xxx.xxx.xxx traffic
                 to ppp0 where another static route
                 sends it to 192.168.1.1 router
                 and out onto the DSL modem.

Linux box: eth0: static class C IP 192.168.1.102
                 netmask 255.255.255.0
           ppp0: static class C IP 192.168.1.103
                 netmask: 255.255.255.0
                 username: per ISP assignment
                 password: per self assignment
           routing:
                 there is, somehow, a static route
                 entry which guides network traffic
                 i.e. non-192.xxx.xxx.xxx traffic
                 to ppp0 where another static route
                 sends it to 192.168.1.1 router
                 and out onto the DSL modem.

the linux box and macos box have DIFFERENT accounts and
different PASSWORDS which, although the ISP did not tell
me, I assume to be the xxxxxx part in email address
xxxxxx@yyyyyyy.net and where the password is the email
password. So I assume the DSL username/password are the
same as the email accounts. Probably this is WRONG!!!

i have tried other configurations (i.e. WAN connect PPPoE
or WAN connect type PPTP in router but am lost as to the
IP, routes, and netmasks for eth0 and ppp0).

Once I get help here the other stuff like pppd, PPP
support into the kernel, the pap-secrets stuff is easy.
If I need masquarading or some such then I *may* need
some help.

shane

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