Help for connection between Linux and Win98 + ADSL!

[Marcello Pietrobon]

I'm not able to connect my Win98 PC to Linux!

I'have an ADSL connection to a provider, and it works.
I've installed a Linux Server (Apache is working).

I need to make Win98 able to see the Linux files and also able to
connect to internet
protected by the Linux-server firewall.

This is the configuration, (where E# are the ethernet cards).

 <-Private Subnet-->         <-Public Subnet->    <-ADSL Line--------->

       X------|
                   |               |--------|
|--------|
                   |               | Linux   |
|ADSL  |            Internet
       X------|----------| System |--------------|modem |---------->
Service
                   | E2     E1|(Router)|E0                 |
|             Provider
                   |               |--------|
|--------|
Win98 -----|            IP_Masq
                         IP_Firewall

  E2:   ACLIENT     E1: BIGSERVER          E0:
adsl-63-192-132-44.dsl.snfc21.provider.net
Domain:                dsl.snfc21.provider.net
  I.P: 192.168.1.4     192.168.1.254       63.192.132.44
nmask: 255.255.255.0   255.255.255.0       255.255.255.0

E0 is the eth0 the primary ethernet card in Linux
E1 is the eth0 the secondary one

 1) From Network Neighborhood I can chose between to access control:
    Share-level or
    User level
  What is better and safer to use in my situation?
  I have to change in agreement with this choice the key
'security=user/share'
  in smb.conf?
  If I use User-level access, do I have to choose 'Windows NT domain' as
kind
  of autenticator?

  This is the main question.

 2) I'm able to ping from every computer to the other one using the
internet
    addresses of the cards. I can do the same using the host names
    but I can't find any way to make windows98 knowing the name
BIGSERVER
    How can do it?
   For this I used, in windows98:
   DNS: Host ACLIENT       Domain: dsl.snfc21.provider.net (but I tried
also provider.net)
   DNS Server Search Order: 192.168.1.254 (and the secondary and
tertiary name
   server of the provider

 3) Finally it doesn't make sense for me to use the same Domain name of
my provider
    for my private network!

Thank you very much for the person wich will give me some light!

Ciao

           Giovanni