Zeroshell is a unique Linux based solution that can provide great benefit for all those who are looking for an industry leading solution but hate to shell out that kind of money.

The best part is that Zeroshell,  as its name implies, it does not  require a shell (command line) to administer and configure, because you can use a web based Graphical user interface.

The plethora of features it offers can put many a commercial solutions to shame. Some of them are mentioned below.
  • Load Balancing and Failover of multiple Internet connections;
  • UMTS/HSDPA connections by using 3G modems;
  • 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;
  • HTTP Proxy server which is able to block the web pages containing virus. This feature is implemented using the ClamAV antivirus and HAVP proxy server. The proxy server works in transparent proxy mode, in which, you don't need to configure the web browsers of the users to use it, but the http requests will be automatically redirected to the proxy;
  • Wireless Access Point mode with Multiple SSID and VLAN support by using WiFi network cards based on the Atheros chipsets. In other words, a Zeroshell box with one of such WiFi cards could become a IEEE 802.11a/b/g Access Point providing reliable authentication and dynamic keys exchange by 802.1X and WPA protocols. Of course, the authentication takes place using EAP-TLS and PEAP over the integrated RADIUS server;
  • 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.

A solution that saves $$$

The picture in the right box depicts a typical investment that most IT departments make. The box on the right shows an equivalent solution that requires just a fraction of money compared to the box on left and still offers more functionality. This is not all, you can do much more with Zeroshell. For instance you can have your users defined in Windows ADS and configure Zeroshell so that all internet users (both Wifi and LAN)  get authenticated by ADS before they are allowed to use internet.

The VPN feature allows two or more branch offices to share resources transparently so that when users travel from one branch office to other they still use the same user-names and passwords to get connected. They also get access to all resources assigned to them, no matter which branch office they are in.


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