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Operating Systems AIX Help Me - AIX server connect to a VPN network Post 302546098 by DGPickett on Wednesday 10th of August 2011 11:14:19 AM
Old 08-10-2011
Conceptually, VPN is a few layers down from telnet and ssh, telnet is a client app, because it connects to an already running server on tcp port 23 as I recall, tcp runs over IP. VPN is the creation of an IP device that routing rules can send packets down, and the local IP stack can accept packets from, similar to a NIC card for Ethernet, but the media is software. PacKets that go in are IPSEC encrypted and sent back to the IP stack to be routed out over other networks. VPN occupies the IPSEC protocol, a child of the IP protocol, a brother to TCP, UDP and ICMP. When IP packets arrive that are IPSEC protocol, they go into the VPN driver; it decrypts them and sends them back through the IP stack. So, you can run anything on VPN, but it is a much bigger deal than running scp.

Perhaps the boss needs some education, as you can achieve file transfer just fine with scp (ssh2 or at least ssh). I am on VPN right now, so I can do all protocols from home as if I was on the office LAN. (My bits are worn down by the time they arrive. :-) That is a lot of exposure if it is not a same company secure site. The encryption and compression of scp is about the same as VPN, but is it a trivial client install not a huge issue with routing and all. Routing? Yes, both hosts have to have network routes that get their packets into the VPN pipe end near them. The VPN pipe might be on the same host, like here on my laptop, or it may be on a firewall of DMZ host or intra-net border router (to get on a lan segment where there is routing to the other host).

Setting up the VPN used to be a proprietary process, even though the end product is standard. A VPN might be permanently set up by admins on routers, or it may be dynamically set us like on my laptop this AM, and probably my CISCO VPN setup client, achieves this differently than other brands, or even other CISCO VPNs at other companies. I suspect they use a ssh tcp server to authenticate and negotiate dynamic client VPN setup. There might be standards now, as I have not been in the firewall biz for quite a while.
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AUSCOPE(1)						      General Commands Manual							AUSCOPE(1)

NAME
auscope - Network Audio System Protocol Filter SYNOPSIS
auscope [ option ] ... DESCRIPTION
auscope is an audio protocol filter that can be used to view the network packets being sent between an audio application and an audio server. auscope is written in Perl, so you must have Perl installed on your machine in order to run auscope. If your Perl executable is not installed as /usr/local/bin/perl, you should modify the first line of the auscope script to reflect the Perl executable's location. Or, you can invoke auscope as perl auscope [ option ] ... assuming the Perl executable is in your path. To operate, auscope must know the port on which it should listen for audio clients, the name of the desktop machine on which the audio server is running and the port to use to connect to the audio server. Both the output port (server) and input port (client) are automati- cally biased by 8000. The output port defaults to 0 and the input port defaults to 1. ARGUMENTS
-i<input-port> Specify the port that auscope will use to take requests from clients. -o<output-port> Determines the port that auscope will use to connect to the audio server. -h<audio server name> Determines the desktop machine name that auscope will use to find the audio server. -v<print-level> Determines the level of printing which auscope will provide. The print-level can be 0 or 1. The larger numbers provide greater output detail. EXAMPLES
In the following example, mcxterm is the name of the desktop machine running the audio server, which is connected to the TCP/IP network host tcphost. auscope uses the desktop machine with the -h command line option, will listen for client requests on port 8001 and connect to the audio server on port 8000. Ports (file descriptors) on the network host are used to read and write the audio protocol. The audio client auplay will connect to the audio server via the TCP/IP network host tcphost and port 8001: auscope -i1 -o0 -hmcxterm auplay -audio tcp/tcphost:8001 dial.snd In the following example, the auscope verbosity is increased to 1, and the audio client autool will connect to the audio server via the network host tcphost, while displaying its graphical interface on another server labmcx: auscope -i1 -o0 -hmcxterm -v1 autool -audio tcp/tcphost:8001 -display labmcx:0.0 SEE ALSO
nas(1), perl(1) COPYRIGHT
Copyright 1994 Network Computing Devices, Inc. AUTHOR
Greg Renda, Network Computing Devices, Inc. 1.9.3 AUSCOPE(1)
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