smb / nmb / ebtables ?

Hello *

Goal; I would like to have a bridging fw between some public accessable
      Desktops in a Library and an institute network with a Web proxy
      
      Users of the Library should be able to get:
      Access to external WEB via another Firewall in the institute
      network  running a SQUID / iptables
      They need access to a Samba home from the same server in order
      to be able to Login on some PC's in order to use GUI based
      Library catalogues

Questions:

1. Samba: Can i build rules for SMB /netbios/ Samba on an bridging firewall
   with ebtables or do i need to run a combination of iptables / ebtables ?
   If so, by chance anyone has examples ?

2. As far as i unsderstand i can build rules for http and DCHP
   even if both services run on another server, correct ?

ASCII-Art:

FW/Proxy Internet<->some trusted institute PC's<>-bridgewall<->untrusted Client

untrusted should be able to use: http, smb / netbios, dhcp to get an
IP from an DHCP Server in the trusted net ...

TIA
Michael
 



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