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Optional Components
• 1-18 additional network cards (if using the Multi-Interface Option)
• Async modem (PPP connections or pager only)
• ISDN TA with RS-232 interface (PPP connections only)
• Cable modem
• Serial ports for COM 1-4 (1645x/1655x UARTs only)
Note
GTA recommends installing only the GB-Ware required or GB-Ware
optional components in the system. Devices such as SCSI controllers
and sound cards remain unused and may decrease performance.
Memory Recommendations
Adding RAM is an easy way to boost system performance. Using 64 MB
RAM, the physically possible maximum number of concurrent sessions is
32,765; using 128 MB RAM, the physically possible maximum is 128,000
connections. Generally, the more features that are being utilized (e.g. DNS
server or Mail Sentinel email proxy), the more RAM is recommended for
optimum performance.
Note
Some GB-Ware options may require additional RAM.
PPP Hardware
GNAT Box System Software supports the use of a PPP network connection
in place of a network interface card for the external network interface. The
PPP interface supports only a
dial-up connection and a single remote system
configuration. Once of the following should be used:
• An external asynchronous modem. COM ports 1-4 are supported;
only COM ports based on the 1645x/1655x UARTs are supported.
• An internal asynchronous modem. Only modems that use
1645x/1655x compliant UARTs are supported.
• An ISDN external modem/terminal adapter. COM ports 1-4 are
supported; only COM ports based on the 1645x/1655x compliant
UARTs are supported.
• Network interface card (NIC) for use with PPPoE (ADSL) or PPTP.
Serial Port Hardware
Most serial ports will easily support any asynchronous modem or a single
BRI 64Kbps ISDN connection. If both channels of a BRI line are used to
achieve 128Kbps, throughput may be limited to 115Kbps due to serial port
limitations.