Diagnostics; Tcp Optimisation; How Does Pep Work - Vocality V200 User Manual

Vocality User Manual
User Manual for V200
Valid for V08_08.02 or V08_48.02

5.11.3 Diagnostics

Two user-level diagnostics commands may be of use. (Please see section 5.7 Issuing
debug commands if you are unsure how to use diagnostic commands.)
The ssh info command reports information about any connected clients (client
address, crypto and HMAC algorithms used). For example, with a single client
connected:
Dbg> ssh info
SessionID: 4097
Client address: 192.168.000.021
InCipher: aes256-ctr
InMAC: hmac-sha1
OutCipher: aes256-ctr
OutMAC: hmac-sha1
The session ID supplied may be used to force the disconnection of this client. The ssh
disconnect session ID command can be used for this. You will need to specify the
Session ID of the client to disconnect. For example:
Dbg> ssh disconnect 4097
Closing SSH session 4097...
Complete
5.12

TCP optimisation

While it is almost impossible to eliminate latency and errors over satellite networks,
their impact can be minimised. Vocality's PEP accelerates application traffic by
eliminating:
The impact of high latency in wasted WAN capacity and link under-utilisation

together with poor performance of large file transfers, disaster recovery backups
and database synchronisations;
The effects of high packet loss and retransmissions;

Bloated TCP/IP packet headers.


5.12.1 How does PEP work?

PEP uses a connection splitting approach described below. A standard TCP session is a
connection-orientated point-to-point streamed conversation between two TCP
endpoints – each TCP endpoint is represented by a unique TCP port and IP address
duplex – in the example below this is port B on machine with address A, and port D on
machine with address C.
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