OVP Forums - A community of assistance, help, questions, and answers.
|
| View previous topic :: View next topic |
| Author |
Message |
DavideQuaglia
Joined: 14 Dec 2013
Posts: 4
Location: Verona, Italy
|
 Posted: Sun Feb 02, 2014 8:54 am Post subject: Firewall problem when launching OVP simulation |
 |
|
When a virtual platform is executed (e.g., by using the command "./platform.Linux32.exe application.OR1K.elf or1k"), OVPSim checks the license by sending a HTTP request to the OVP License Manager. Here you can find such request followed by the corresponding response.
| Code: |
-------request----------
GET http://www.ovpworld.org/tools/date.php?vidc=5c18eed5838ca43839ae74d71b661fd2 HTTP/1.0
Host: www.ovpworld.org
User-Agent: http_get
Accept: */*
Accept-Encoding:
Accept-Language: en
Accept-Charset: iso-8859-1,*,utf-8
-------response----------
HTTP/1.1 200 OK
Date: Tue, 14 Jan 2014 08:37:43 GMT
Server: Apache/2.2.3 (CentOS)
X-Powered-By: PHP/5.3.27
Content-Length: 84
Connection: close
Content-Type: text/html; charset=UTF-8
7a35614f0a170851165c4a042e62634f5c4b0d01195b16507e3466415e140856145d42567b6661465b
|
Some new OVP users experience a long delay after launching OVPSim, followed by a license error. First of all, the following common problems must be checked:
- the license file is correct (sometimes, the installation of new OVP packages resets this file);
- the environment variables are correctly set;
- user's organization does not use a web proxy or, in affirmative case, the corresponding environment variable is set.
If these aspects have been checked, the problem could be due to the firewall of the user's organization which blocks the exiting HTTP request. Why?
Let's analyze the same HTTP request/response reproduced by using a normal web browser (e.g., Firefox).
| Code: |
-------request----------
GET /tools/date.php?vidc=5c18eed5838ca43839ae74d71b661fd2 HTTP/1.1
Host: www.ovpworld.org
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:26.0) Gecko/20100101 Firefox/26.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
Cache-Control: max-age=0
-------response----------
HTTP/1.1 200 OK
Date: Tue, 14 Jan 2014 08:50:18 GMT
Server: Apache/2.2.3 (CentOS)
X-Powered-By: PHP/5.3.27
Content-Length: 84
Connection: close
Content-Type: text/html; charset=UTF-8
7a35614f0a170851165c4a042e62634f5c4b0d01195b16507e3466415e140856145d42567b6661465b
|
Normally, this interaction is not blocked by the same firewall. If we compare the two requests, in the OVPSim one we can notice a strange value for the field "User-Agent:", i.e., "http_get". This value forces many level-7 firewalls to block the request.
I kindly ask OVP developers to fix the problem in the OVP simulator. In the meantime, users can ask their sys-admin to change firewall rules at least for the IP addresses of the workstations devoted to OVP simulation. If the firewall does not allow this solution, the sys-admin can setup a web proxy for which no restriction is specified in the firewall; this proxy could be used only by OVP users which should set the corresponding environment variable as follows:
| Code: |
IMPERAS_PROXY_SERVER=<ipaddr>:<port>
|
|
|
| Back to top |
|
 |
ChrisSmith
Joined: 27 Sep 2013
Posts: 28
|
| Posted: Thu Feb 27, 2014 2:21 am Post subject: |
|
|
Hi Davide,
I've the same issue, but cannot add firewall exceptions like that.
So, dear OVP dev folks, can you please change that behavior, I also plan to test your tools in a totally isolated env where no network at all is available.
Question to OVP: why do you need absolutely to check validity of the license?
Chris |
|
| Back to top |
|
|
LeeMoore
OVP Technologist
Joined: 27 Feb 2008
Posts: 633
|
| Posted: Thu Feb 27, 2014 2:40 am Post subject: |
|
|
Hi Chris,
I recall there are 2 potential issues
1. do you use a proxy server to access the internet, or do you have direct access
if you use a proxy server you need to configure the simulator to access via this proxy server
| Quote: | Please set the following variable accordingly, based on the settings of your network proxy server
IMPERAS_PROXY_SERVER=<ipaddr>:<port> |
2. the issue Davide reported was due to a malformed http request, whcih we have fixed in
an internal beta version
I will speak to our release manager about promoting this beta version to the external OVP website
Thx
Lee |
|
| Back to top |
|
|
ChrisSmith
Joined: 27 Sep 2013
Posts: 28
|
| Posted: Thu Feb 27, 2014 2:44 am Post subject: |
|
|
Hi Lee,
Whoa, that's super fast reply, thanks!
Ok: yes, we use proxy here to go on internet, got that. I also understand that with uncounted license type, there is no such way around than the mandatory connection to the internet, correct? So: do I've to check w/ Imperas directly if I want to evaluation your products in an isolated env with no internet access at all?
For Davide's problem: got that, thanks.
Best Chris |
|
| Back to top |
|
|
LeeMoore
OVP Technologist
Joined: 27 Feb 2008
Posts: 633
|
| Posted: Thu Feb 27, 2014 3:54 am Post subject: |
|
|
Hi Chris
| Quote: | | I also understand that with uncounted license type, there is no such way around than the mandatory connection to the internet, correct? |
That is correct
| Quote: | | So: do I've to check w/ Imperas directly if I want to evaluation your products in an isolated env with no internet access at all? |
That is correct also, I will PM you with an Imperas contact to discuss obtaining an eval license
Thx
Lee |
|
| Back to top |
|
|
ChrisSmith
Joined: 27 Sep 2013
Posts: 28
|
| Posted: Thu Feb 27, 2014 3:56 am Post subject: |
|
|
Thanks Lee for you help.
Regarding Imperas, I already am in touch w/ Larry Lapides, had a quick talk with him recently. Must admit that for the moment I've to get used to what does each one between OVPWorld and Imperas :)
Best Chris |
|
| Back to top |
|
|
ChrisSmith
Joined: 27 Sep 2013
Posts: 28
|
| Posted: Fri Feb 28, 2014 12:20 am Post subject: |
|
|
Hi Lee,
Just to mention I finally found proxy config here, set the env var, works as epxected, really cool, now I am set and can play ... must say your sim models are amazingly fast, very good JIT and morphing, really good!
Chris |
|
| Back to top |
|
|
LeeMoore
OVP Technologist
Joined: 27 Feb 2008
Posts: 633
|
| Posted: Fri Feb 28, 2014 2:16 am Post subject: |
|
|
Hi Chris,
Thanks for the validation :-)
So just to confirm, your issue was only the proxy server, and nothing to do with the issue reported earlier in the thread regarding firewall
| Quote: | | "User-Agent:", i.e., "http_get" |
Thx
Lee |
|
| Back to top |
|
|
ChrisSmith
Joined: 27 Sep 2013
Posts: 28
|
| Posted: Mon Mar 10, 2014 4:55 am Post subject: |
|
|
Hi Lee,
Yes, just the proxy, nothing else.
But as already mentioned: could be a very good argument to provide offline evaluation period too wo/ need to connect to your servers for validation. Feasible? And if not why?
Thanks for your fast support.
Br Chris |
|
| Back to top |
|
|
DuncGrah
OVP Technologist
Joined: 27 Feb 2008
Posts: 1642
Location: United Kingdom
|
| Posted: Tue Mar 11, 2014 2:49 am Post subject: |
|
|
Hi Chris,
As the reference simulator from OVP, OVPsim, is free to download and use directly from the OVPWorld website there is no control over where the technology goes so we add some restrictions; being connected to the internet is one of them.
If you wish to evaluate an equivalent simulator without this restriction and which can be used for commercial purposes (OVPsim is restricted to non-commercial usage) please contact info@imperas.com |
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
Information regarding OVP © 2008-2022 Imperas Software
|
FAQ
Search
Register
Profile
Log in to check your private messages
Log in
