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Internet address classes (Class A=255.0.0.0; Class B=255.255.0.0; Class
C=255.255.255.0 – see Appendix C.2); but more flexibility is provided by
this mask, as other ranges may be defined.
IP Fragmentation (Free Format Text, 6)
This is a mandatory field, but defaults to 576. It contains a number
between 128 and 1500, which specifies the maximum IP datagram size
before fragmentation occurs.
IP Time to Live (Free Format Text, 6)
This is a mandatory field, but defaults to 32. It contains a number between
2 and 255. It is used to prevent IP datagrams drifting aimlessly through a
network. Any datagram that lives longer than this period, or passes
through this many IP routers, is discarded.
TCP Window Size (Free Format Text, 6)
This is a mandatory field, but defaults to 512. It contains a number
between 128 and 4096 in bytes. It is used to determine the number of
unacknowledged bytes that can be sent to Router, i.e. the maximum
number of bytes in transit across the network between the remote device
and Router.
TCP Max Segment Size (Free Format Text, 6)
This is a mandatory field, but defaults to 536. It contains a number
between 128 and 4120 in bytes. It defines the maximum size of a TCP
segment (packet). It is often set to ensure that TCP segments can be sent
using single unfragmented IP datagrams.
TCP Initial RTT (Free Format Text, 6)
This is a mandatory field, but defaults to 50. It contains a number between
2 and 999 in 10ths of a second. This is the round trip of the TCP link. It is
used in assessing whether to re-transmit packets.
Keepalive (Constrained List)
This feature allows Router to detect that a LAN user (or host) has
disappeared from the LAN network when there is no user activity. Router
will poll each LAN session every n seconds to check the host (and session)
are still active. If Router gets no response from the session then it will go
through the normal re-transmission sequence and then disconnect the
session.
Enabled- Perform Keepalive
Disabled - Do not perform Keepalive
X870-300351 Issue 1
4-14
Rev.0
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