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Topic Title: Remote access to Doors Server
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Created On: 17-Nov-2004 08:28
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 17-Nov-2004 08:28
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Stefan Heid

Posts: 1
Joined: 16-Nov-2004

Does anybody have any experience to running Doors remote via VPN ?
We plan to work with 50 Doors clients in a remote network.
But I don't know the data rate Doors need and the bandwitch we need.

Sorry for me bad english

Stefan Heid
Diehl Avionik Systeme, Germany
 
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 17-Nov-2004 15:27
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Hazel Woodcock

Posts: 38
Joined: 4-Oct-2002

I have run DOORS 5 over a VPN. It is not something you would want to do a lot of, but if you can be a bit patient about opening modules and saving them and don't have any traceability columns to worry aobut, it is not too painful. Presumably if you are working over a VPN you are used to havign to go and get coffee while the link sorts out your email inbox anyway.
Patience is a virtue.

-------------------------
Hazel Woodcock
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 1-Dec-2004 16:11
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Dan Hopping

Posts: 75
Joined: 21-Nov-2002

We have been successful at using DOORs via VPN. As mentioned in the previous post, it's a bit slower but it has fairly worked well for us. The only issue you may run into is in license agreements. The 'floating licenses' for DOORs are sold by Telelogic as Single Site or Multi-Site (a bit more expensive) licenses. We had to purchase some Multi-Site licenses to remain 'legal' to our license agreement.
Technically the license server works with either type of license. It's purely a legal matter with the license agreement for Single Site licenses vs. Multi-Site licenses.
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 1-Dec-2004 16:27
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Antonio Norkus

Posts: 109
Joined: 28-Jun-2003

To reduce the bandwidth requirements, I would recommend using CITRIX to distribute the DOORS application. Although I don't use a VPN to access DOORS, the network we use is notoriously slow and DOORS still performs very well when using CITRIX.
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 2-Dec-2004 17:21
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Ken Mcguffie

Posts: 63
Joined: 3-Feb-2004

Have you thought of using DOORS Net?
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 3-Dec-2004 11:43
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Ross Morgan

Posts: 74
Joined: 15-Apr-2004

If you want access to views, DXL, and tools, then I wouldn't suggest DOORSnet. DOORSnet is good for reading/reviewing requirements and writing a few comments. Also, you can't use your standard DOORS login for DOORSnet - you need to define "DOORSnet" user logins. DOORSnet is licensed separately and requires a dedicated web server + DOORS server + DOORS client installation.

DOORS works really well on Citrix. The bandwidth is the same as for windows remote terminal sessions(which isn't surpising because windows terminal services are largely based on the citrix solution), so latency isn't a problem and you can get by with a relatively low bandwidth internet connection. However, you need to factor in the costs of hosting a Citrix server
-dedicated machine + administration
-Citrix licenses, windows terminal services client access license etc
Also, if you have any custom DXL on your machine then you will need to upload & synch it with your user space on the Citrix server.

I've accessed DOORS via VPN over 128Kb and 1Mb connections with success (20:1 contention ratio or less), but I wouldn't recomend a 56Kb dialup line. I shut down MS Outlook and any other chatty applications to maximise performance and avoid copying over any files at the same time. Also, I avoid large DOORS modules.

Even though DOORS is fairly good with bandwidth (it uses data compression & efficient data encoding) and unreliable connections (re-establishes sockets with the server), it still basically works like a file server via TCP so latency is the big factor rather than bandwidth. Some VPN servers and network switches support traffic prioritisation by TCP port number, so this is a good way to minimise latency through contention - especially over a VPN tunnel WAN. If your internet connection is high latency then you might try TCP spoofing at your access point - but Citrix or some other remote method would be more appropriate.

NetOP and VNC are two good remote control packages I have used over a VPN link with comparable or better performance than a terminal services session. VNC is free. NetOP is better. The benefit here is that it gives me access to my desktop PC and custom DXL. A small disadvantage is that the session isn't private and everything I do is visible on my desktop PC.
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 16-Mar-2005 23:18
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Cameron Poole

Posts: 12
Joined: 28-Feb-2003

We've let remote user access Doors via the Microsoft RemoteDesktop utility with good success. We set up the doors client on a server that does not have a Node lock license so that every user is using a seperate concurrent license. Its just been a couple of folks spread out over a year or two so I can't tell you anything about scaleability.
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 7-Apr-2005 09:39
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Edwin Buisman

Posts: 38
Joined: 12-Aug-2004

I have used a connection over several VPN's and with NAT adres translations, The only problem I got was with the license server, I had to add some entries in the hosts file. The speed depends on your line. I also tried this with collegues in China, a bit slow but without problems!
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 4-May-2005 12:05
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Kristian Bøe

Posts: 29
Joined: 16-Jun-2003

I got the following rules of thumb from Telelogic when discussing this:

If the ping response is 50 ms or less it's OK.
80 ms will work.
100ms is too much.

Naturally larger modules ar much worse than small compact ones.

When we had subcontractors in India using a 1 mb line (all of their companys data and phone traffic used this line so it was choked!) via Florida, it took them something like 20 minutes just to log on to DOORS.

-------------------------
Kristian Bøe
Extenda AB
Kristian.Boe@extenda.se

Edited: 4-May-2005 at 12:08 by Kristian Bøe
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 17-Nov-2005 22:18
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Cornelia Watson

Posts: 14
Joined: 12-Feb-2003

Ping tests at our facility are not permitted, they are blocked as a rule to prevent pingflood DOS or ping discovery which means no contact with the server can be made initially. It is possible to test the port rules by telnet <IP> <PORT> but without ping your are severely limited.

The first thing DOORS does on startup is attempt to contact the server using ping. We had to sniff this out with Ethereal to see why we couldnt get a remote connection to the server and saw this as the first network response from the client. Since Ping is blocked, no joy.

In the civilian world, IDS, ACLs and fire wall rules work...in the Outer Limits where I am at, networking is at paranoia levels.

Edited: 17-Nov-2005 at 22:21 by Cornelia Watson
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