Yet, Another Interesting Linux Distribution

It should appear as a non easy distribution to use but it’s false. ZeroShell is one of the easy and important server-oriented distribution that I’ve ever seen. Lots of services like RADIUS, KERBEROS and Captive Portal are quite difficult to setting-up and to use. Thanks to 0shell the configuration and the setting-up of these services is really easy and fast. Yep, fast. Right now one of the majors problems that fight against Linux is the not faster setting-up of services. With others systems it’s pretty easy install and configure the whole service; instead on Linux platforms, in particular if you are an old style geek it’s result so difficult and it takes a lot of time. Well, it’s not true thanks 0shell. Actually you can download and install it; keep it and get out your old systems :-D. 
Grabbed from the site:

Zeroshell is a small Linux distribution for servers and embedded devices aimed at providing the main network services a LAN requires. It is available in the form of Live CD or Compact Flash image and you can configure and administer it using your web browser. The main features are listed below:

RADIUS server for providing secure authentication and automatic management of the encryption keys to the Wireless 802.11b, 802.11g and 802.11a networks supporting the 802.1x protocol in the EAP-TLS, EAP-TTLS and PEAP form or the less secure authentication of the client MAC Address; WPA with TKIP and WPA2 with CCMP (802.11i complaint) are supported too; the RADIUS server may also, depending on the username, group or MAC Address of the supplicant, allow the access on a preset 802.1Q VLAN;

Captive Portal to support the web login on wireless and wired networks. Zeroshell acts as gateway for the networks on which the Captive Portal is active and on which the IP addresses (usually belonging to private subnets) are dynamically assigned by the DHCP. A client that accesses this private network must authenticate itself through a web browser using Kerberos 5 username and password before the Zeroshell’s firewall allows it to access the public LAN. The Captive Portal gateways are often used to provide authenticated Internet access in the HotSpots in alternative to the 802.1X authentication protocol too complicated to configure for the users. Zeroshell implements the functionality of Captive Portal in native way, without using other specific software as NoCat or Chillispot;

QoS (Quality of Service) management and traffic shaping to control traffic over a congested network. You will be able to guarantee the minimum bandwidth, limit the max bandwidth and assign a priority to a traffic class (useful in latency-sensitive network applications like VoIP). The previous tuning can be applied on Ethernet Interfaces, VPNs, bridges and VPN bondings. It is possible to classify the traffic by using the Layer 7 filters that allow the Deep Packet Inspection (DPI) which can be useful to shape VoIP and P2P applications;

Host-to-lan VPN with L2TP/IPsec in which L2TP (Layer 2 Tunneling Protocol) authenticated with Kerberos v5 username and password is encapsulated within IPsec authenticated with IKE that uses X.509 certificates;

Lan-to-lan VPN with encapsulation of Ethernet datagrams in SSL/TLS tunnel, with support for 802.1Q VLAN and configurable in bonding for load balancing (band increase) or fault tolerance (reliability increase);

Router with static and dynamic routes (RIPv2 with MD5 or plain text authentication and Split Horizon and Poisoned Reverse algorithms);

802.1d bridge with Spanning Tree protocol to avoid loops even in the presence of redundant paths;

802.1Q Virtual LAN (tagged VLAN);

Firewall Packet Filter and Stateful Packet Inspection (SPI) with filters applicable in both routing and bridging on all type of interfaces including VPN and VLAN;

It is possible to reject or shape P2P File Sharing traffic by using IPP2P iptables module in the Firewall and QoS Classifier;

NAT to use private class LAN addresses hidden on the WAN with public addresses;

TCP/UDP port forwarding (PAT) to create Virtual Servers. This means that real server cluster will be seen with only one IP address (the IP of the virtual server) and each request will be distributed with Round Robin algorithm to the real servers;

Multizone DNS server with automatic management of the Reverse Resolution;

Multi subnet DHCP server with the possibility to fix IP depending on client’s MAC address;
PPPoE client for connection to the WAN via ADSL, DSL and cable lines (requires a suitable MODEM);

Dynamic DNS client used to easily reach the host on WAN even when the IP is dynamic;

NTP (Network Time Protocol) client and server for keeping host clocks synchronized;

Syslog server for receiving and cataloging the system logs produced by the remote hosts including Unix systems, routers, switches, WI-FI access points, network printers and others compatible with the syslog protocol;

Kerberos 5 authentication using an integrated KDC and cross-authentication between realms;
LDAP, NIS and RADIUS authorization;

X509 certification authority for issuing and managing electronic certificates;

Unix and Windows Active Directory interoperability using LDAP and Kerberos 5 cross realm authentication.