Avaya Configuring IP Services Manual do Utilizador Página 101

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Customizing IP Services
114065 Rev. A 3-37
TFTP runs on top of the User Datagram Protocol (UDP) and uses timeout and
retransmission to ensure that data arrives. Each file transfer begins with a request
to read or write to a file; this request also serves to ask for a connection. If the
server grants the request, the connection is opened and the file is sent in
fixed-length blocks (data packets) of 512 bytes. Each data packet contains one
block of data and must be acknowledged by an acknowledgment packet before the
next packet is sent. A data packet of less than 512 bytes terminates the transfer.
If a packet gets lost in the network, the intended recipient will time out and may
retransmit its last packet (which can be data or an acknowledgment), causing the
sender of the lost packet to retransmit the packet. Because the lock-step
acknowledgment guarantees that all older packets have been received, the sender
keeps one packet only on hand for transmission.
Both devices involved in a TFTP transfer are senders and receivers. One device
sends data and receives acknowledgments; the other device sends
acknowledgments and receives data.
The IP router includes a client and server implementation of TFTP, enabling the
router to transmit and receive files across an Internet.
You can use Site Manager to specify the operating characteristics of TFTP on the
router.
Configuring the Revised IP Security Option on an Interface
IP routers support the Department of Defense (DoD) Revised IP Security Option
(RIPSO), as defined in RFC 1108, on a per-interface basis. While RIPSO RFC
1108 specifies both “basic” and “extended” security options, our implementation
supports only the basic option.
Site Manager: Enable parameter: page A-53
Site Manager: Default Volume parameter: page A-53
Site Manager: Close Time Out parameter: page A-54
Site Manager: Retry Time Out parameter: page A-54
Site Manager: Retransmit parameter: page A-54
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