Skip to ContentSkip to Footer
Start of content
- Community Home
- >
- Servers and Operating Systems
- >
- Operating System - OpenVMS
- >
- Two network Cards vs Application
Operating System - OpenVMS
-
-
Forums
- Products
- Servers and Operating Systems
- Storage
- Software
- Services
- HPE GreenLake
- Company
- Events
- Webinars
- Partner Solutions and Certifications
- Local Language
- China - 简体中文
- Japan - 日本語
- Korea - 한국어
- Taiwan - 繁體中文
-
- Advancing Life & Work
- Advantage EX
- Alliances
- Around the Storage Block
- HPE Ezmeral: Uncut
- OEM Solutions
- Servers & Systems: The Right Compute
- Tech Insights
- The Cloud Experience Everywhere
- HPE Blog, Austria, Germany & Switzerland
- Blog HPE, France
- HPE Blog, Italy
- HPE Blog, Japan
- HPE Blog, Middle East
- HPE Blog, Latin America
- HPE Blog, Russia
- HPE Blog, Saudi Arabia
- HPE Blog, South Africa
- HPE Blog, UK & Ireland
- HPE Blog, Poland
-
Blogs
- Advancing Life & Work
- Advantage EX
- Alliances
- Around the Storage Block
- HPE Blog, Latin America
- HPE Blog, Middle East
- HPE Blog, Saudi Arabia
- HPE Blog, South Africa
- HPE Blog, UK & Ireland
- HPE Ezmeral: Uncut
- OEM Solutions
- Servers & Systems: The Right Compute
- Tech Insights
- The Cloud Experience Everywhere
-
Information
- Community
- Welcome
- Getting Started
- FAQ
- Ranking Overview
- Rules of Participation
- Tips and Tricks
- Resources
- Announcements
- Email us
- Feedback
- Information Libraries
- Integrated Systems
- Networking
- Servers
- Storage
- Other HPE Sites
- Support Center
- Aruba Airheads Community
- Enterprise.nxt
- HPE Dev Community
- Cloud28+ Community
- Marketplace
-
Forums
-
Forums
-
Blogs
-
Information
-
English
Topic Options
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
11-16-2010 08:43 AM
11-16-2010 08:43 AM
Two network Cards vs Application
Hi all,
I have an application written in C language using socket routines to communicate with a machine. This application has been running for years with no problem detected.
Last week our IT team put another network card in VMS machine and the communication became too instable, sometimes works, sometimes doesn't.
Does anyone have an idea about what's happening?
OpenVMS AXP 7.3-2
TCPIP Services 5.4
I have an application written in C language using socket routines to communicate with a machine. This application has been running for years with no problem detected.
Last week our IT team put another network card in VMS machine and the communication became too instable, sometimes works, sometimes doesn't.
Does anyone have an idea about what's happening?
OpenVMS AXP 7.3-2
TCPIP Services 5.4
3 REPLIES 3
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
11-16-2010 09:27 AM
11-16-2010 09:27 AM
Re: Two network Cards vs Application
Yeah, you need to do some debugging and figure out if this is the network card, a network issue, a duplex or speed setting or negotiation issue, an IT-induced problem, a VMS bug or (best guess) your code is buggy.
That you're here implies that latent errors often implies that the application code is the likely culprit.
You'll next and justifiably point out that the code has run flawlessly for [insert years], which is typical of the story arc of previous posters with buggy code.
We'll then ask for a reproducer of the issue, and you'll eventually be convinced that's necessary, but will have some difficulty creating that reproducer, as it's probably something in the existing application code; the standalone reproducers will tend to work.
Which then leads to a discussion of asynchronous synchronization techniques, proper IOSB handling and allocations, and various related issues.
If the story arc here ends where it often does, the C code is found to have one or more latent errors in a central I/O path, and which have been exacerbated by performance differences with the controller.
For the occasional variation to maintain interest in the usual "it broke! why?" story arc here, sometimes we'll work through this with you to discover that there's a bad or loose cable, or a faulty controller, or a switch is set incorrectly or has mis-negotiated its speed setting or its duplex setting, an IP or VMS software bug that's come to the fore, or the switch port has gone weird as managed switches are occasionally wont to do.
That you're here implies that latent errors often implies that the application code is the likely culprit.
You'll next and justifiably point out that the code has run flawlessly for [insert years], which is typical of the story arc of previous posters with buggy code.
We'll then ask for a reproducer of the issue, and you'll eventually be convinced that's necessary, but will have some difficulty creating that reproducer, as it's probably something in the existing application code; the standalone reproducers will tend to work.
Which then leads to a discussion of asynchronous synchronization techniques, proper IOSB handling and allocations, and various related issues.
If the story arc here ends where it often does, the C code is found to have one or more latent errors in a central I/O path, and which have been exacerbated by performance differences with the controller.
For the occasional variation to maintain interest in the usual "it broke! why?" story arc here, sometimes we'll work through this with you to discover that there's a bad or loose cable, or a faulty controller, or a switch is set incorrectly or has mis-negotiated its speed setting or its duplex setting, an IP or VMS software bug that's come to the fore, or the switch port has gone weird as managed switches are occasionally wont to do.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
11-16-2010 02:01 PM
11-16-2010 02:01 PM
Re: Two network Cards vs Application
to isolate the problem you can use tcptrace and tcpdump utilities.
It is possible that application does not know which IP interface (network card) to use to communicate with that machine.
It is possible that application does not know which IP interface (network card) to use to communicate with that machine.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content
11-17-2010 12:03 AM
11-17-2010 12:03 AM
Re: Two network Cards vs Application
Please provide the address and mask for each interface. Also list the default route and any other routes listed.
If you don't have time to do it right, when will you have time to do it over? Reach me at first_name + "." + last_name at sysmanager net
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
End of content
United States
Hewlett Packard Enterprise International
Communities
- Communities
- HPE Blogs and Forum
© Copyright 2022 Hewlett Packard Enterprise Development LP