Aethra StarVoice, Руководство по установке, Страница: 22 / 39

If PPP (RFC2364 or RFC2516) is used, StarVoice manages the authentication procedure
for local hosts. If PPPoE is used, StarVoice implements the discovery procedure and
encapsulates PPP datagrams in PPP in Ethernet-type frames, such as PDU RFC1483
bridged MAC.
4.6.2 LLC SNAP Encapsulation
StarVoice can be configured to have a different LLC SNAP encapsulation for every PVC.
LLC SNAP encapsulation is needed when operating with MAC bridging, that is to say
when the Spanning Tree algorithm is enabled on the same PVC or when operating with
bridging and routing mode at the same time.
4.6.3 MAC Bridging
StarVoice can be configured to operate as bridge at MAC level. Up to 4 logic bridges
(bridge groups) between LAN or WAN (ATM VCC’s) interfaces can be configured. The
Spanning Tree algorithm can be programmed for every bridge group.
4.6.4 IP Routing
StarVoice operates as IP router. Part of the routing table is statically defined during
configuration. If enabled, StarVoice also uses RIP (v1, v1compatible, v2,) to exchange
routing information with contiguous routers and updated routing tables.
One RIP mode can be defined for every ATM PVC, including passive RIP function. This
mode is used by StarVoice to learn and use messages from contiguous routers without
sending routing table information.
One of the ATM PVC’s can be configured as default gateway: packets that cannot be
routed are sent to this PVC. Normally, the default gateway is used to connect StarVoice
with the Internet Service Provider.
4.6.5 Network Address and Port Translation (NAPT)
StarVoice supports NAT (Network Address Translation) and PAT (Port address
Translation) advanced functionalities that allow for using private IP addresses (assigned
freely) on the local network and a public IP address typically supplied by the ISP on the
WAN ports.
This solution allows for using multiple PCs in the LAN at the same time to access external
resources (for example Internet) while having subscribed a single contract with the ISP.
4.6.6 Firewall functionality (Access Lists)
StarVoice provides a powerful, flexible mechanism to protect the internal network from
intrusions and attacks and manage access rights of individual hosts to external services.
For example, you can decide which hosts can use e-mail, navigate on the Internet or access
StarVoice programming.
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