Encore ENDSL-4R5G User Manual page 118

MRU: Maximum Receive Unit: MRU is the largest size packet that can be received by the
modem. During the PPP negotiation, the peer of the PPP connection will indicate its MRU and
will accept any value up to that size. The actual MTU of the PPP connection will be set to the
smaller of the two (MTU and the peer's MRU). In the normal negotiation, the peer will accept
this MRU and will not send packet with information field larger than this value.
MSS: Maximum Segment Size: The largest size of data that TCP will send in a single
un-fragmented IP packet. When a connection is established between a LAN client and a host
in the WAN side, the LAN client and the WAN host will indicate their Maximum Segment Size
during the TCP connection handshake.
MTU: Maximum Transmission Unit: The largest size packet that can be sent by the modem. If
the network stack of any packet is larger than the MTU value, then the packet will be
fragmented before the transmission. During the PPP negotiation, the peer of the PPP
connection will indicate its MRU and will accept any value up to that size. The actual MTU of
the PPP connection will be set to the smaller of the two (MTU and the peer's MRU).
NAPT: Network Address and Port Translation: An extension of NAT, NAPT maps many
private internal addresses into one IP address. The outside network (WAN) can see this one
IP address but it cannot see the IP addresses of individual devices translated by the NAPT.
NAT: Network Address Translation: The translation of an IP address of one network to a
different IP address known by another network. This gives an outside network (WAN) the
ability to distinguish a device on the inside network (LAN), as the inside network has a private
set of IP addresses assigned by the DHCP server not known to the outside network.
PAP: Password Authentication Protocol: An authentication protocol in which authorization is
done through a set of user name and password.
PDU: Protocol Data Unit: A frame of data transmitted through the data link layer 2.
Ping: Packet Internet Groper: A utility used to determine whether a particular device is online
or connected to a network by sending test packets and waiting for a response.
PPP: Point-to-Point Protocol: A method of transporting and encapsulating IP packets between
the user PC and the ISP. PPP is full duplex protocol that is transmitted through a serial
interface.
Proxy: A device that closes a straight connection from an outside network (WAN) to an inside
network (LAN). All transmissions must go through the proxy to get into or out of the LAN. This
makes the internal addresses of the devices in the LAN private.
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