RACOM RipEX 1.12.0 User Manual Download

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There is also a "stream" compression, which is very effective for data streams consisting of similar
packets. E.g. when there are many remotes behind a single repeater, packets on the most loaded hop
between the repeater and the central unit get very efficiently compressed. Note: when there is only
one direction traffic, there should be also routing for ETH IP addresses set in RipEX routing tables to
make stream compression effective.
In addition a special TCP optimiser is used for TCP/IP connections. It supervises every TCP session
and eliminates redundant packets. It also compresses TCP headers in a very efficient way. The overall
effect of the Optimization depends on many factors (data content, packet lengths, network layout etc.),
the total increase of network throughput can be anything from 0 to 200%, or even more in special cases.

Note

: Apart from this Optimization, there is an independent compression on the Radio channel, which

works in both Operating modes, Bridge and Router. This compression is always On.

Encryption

AES 256 (Advanced Encryption Standard) can be used to protect your data from an intrusion on Radio
channel. When AES 256 is On, control block of 16 Bytes length is attached to each frame on Radio
channel. AES requires an encryption key. The length of key is 256 bits (32 Bytes, 64 hexa chars). The
same key must be stored in all units within the network.
List box: Off, AES 256
Default = Off

When AES 256

Key mode

List box: Pass Phrase, Manual
Default = Pass Phrase

•

Pass phrase

It is not necessary to fill in 32 Bytes of hexa chars in order to set the encryption key. The key can
be automatically generated based on a Pass phrase. Fill in your Pass phrase (any printable ASCII
character, min. 1 char., max. 128 char.). The same Pass phrase must be set in all units within the
network

•

Manual

The key can be configured manually (fill in 32 Bytes of 64 hexa chars) or it can be randomly generated
using Generate button. The same key must be in all units within the network, i.e. it has to be gener-
ated only in one unit and copied to the others.

MTU [bytes]*

Default = 1500 Bytes [70 - 1500] (max. packet size)

When a packet to be transmitted from the Radio interface is longer than the MTU (Maximum Transmis-
sion Unit) set, the RipEX router performs standard IP fragmentation. A packet longer than the configured
size is split into the needed number of fragments, which are then independently transmitted - the first
packet(s) is (are) transmitted fragment-size long, the last packet contains the remaining bytes. The
reassembly of the fragments into the original packet normally takes place in the unit at the end of the
path.
Reducing the maximum length of a frame on a Radio link may improve its performance under unfavour-
able conditions (interference, multi-path propagation effects). However the recommended place to
determine the packet size is the actual user interface, e.g. a COM port. Note that the IP fragmenting
is possible in the Router mode only.

RipEX Radio modem & Router – © RACOM s.r.o.

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Advanced Configuration