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1st : Internet Connection Sharing/Web-Cache/Firewall (replacement of ISA Server)
2nd : Authentication server (Replacement of Active Directory server)
3rd : For File Sharing and Mail Server
I have 300-400 users (mostly windows clients) on my network. So I need some strong web-filtering and access control plus windows client authentication with linux server. I request you to please suggest me the distro for each and reliable software available in linux for the tasks. Thanks...
Distribution: Ubuntu 11.4,DD-WRT micro plus ssh,lfs-6.6,Fedora 15,Fedora 16
personally i would use either fedora or centos for the distribution
for the 1st part i would actually split into 2 servers, a smoothwall or ipcop server for the internet connection sharing/firewall and a squid server (on fedora or centos) for the web cache, the smoothwall doesn't have to be a hugely powerful machine, something that you find at a garage sale would be powerful enough
for the 2nd part and the first half of the 3rd part (the file sharing), i would recommend samba if you are going to have windows clients, possibly combined with LDAP for authentication, samba can be configured as a domain controller and also handles file sharing.
as for the second half of the 3rd part (the mail server) i would use postfix