On Windows, I've used NEWT in the past, but it's difficult to use, not current (but I can find old copies on non-MS sites), and difficult though possible to degrade just the app's view of the network without messing up everything else on the machine like the VPN connection and NAS volumes.
On Mac, the Network Link Conditioner that is available with Xcode is far too limited and in particular doesn't model bursts, which is my current immediate interest.
I'm also interested in Windows programs running in a VMware VM, and that's already going through an emulated network connector. I wonder if that can be made to do the traffic shaping?
In summary, can someone suggest a tool that I ought to be using for this?
I guess http://henrydu.com/blog/how-to/simulate-a-slow-link-by-linux-bridge-123.html should work on your mac. It uses traffic control with ifconfig, something you might want to google for.
Related
I am beginning to study the use of virtual machines with realtime applications, specifically network applications.
While I do understand the limitations and concerns, I'd like to get ideas as to how to get started on this task.
I am going to use a DPDK sample application over Linux, and probably use VMWare for starters. However, I do not know what my first steps with respect to setting up VMWare should be.
First I think it is better to use open source solution like QUEM/KVM for your virtualization platform. Many platform exist for run high performance network functions on virtualized platforms you can see OpenNetVM for example in order to get basic ideas.
With OpenStack's architecture, is it possible to, for instance, have a PowerPC64 (Altivec) machine, a Intel CoreDuo machine, and a ARMv6 all on the same cluster?
Or is this impossible, because of the restrictions in building buildpacks when deploying to multiple architectures?
EDIT: Whoops, I meant OpenStack, not OpenShift ;)
The answer above is correct (answer from developercorey).
Although whether this suits you depends on how its managed and what your trying to achieve. Typically when you add servers with different physical attributes such as CPU, Disk, Network cards etc you group them into different host aggregates.
By default when you launch a VM it will try and find a suitable host, but you can also tag it, so for example if your VM required alot of disk IO, you might want to place it on a host that has SSD drivers. So you can put those hosts into a 'SSD' aggregate, and then when launching your VM you can make sure it goes to a host in that aggregate.
If your just trying to make the most out of the hardware you have, then I don't see any issue by mixing them.
I don't think that they have to be, but I do believe that they only build packages for 1 or 2 architechtures, so I'm not sure how many options you really have there.
My company has been using Hamachi to access our SVN repository for a number of years. We are a small yet widely distributed development team with each programmer in a different country working from home. The server is hosted by a non-techie in our central office. Hamachi is useful here since it has a GUI and supports remote management.
This system worked well for a while, but recently I have moved to a country with poor internet speeds. Hamachi will no longer connect 99% of the time - instead I get a "Probing..." message that doesn't resolve. It's certain to be a latency issue, as the same laptop will connect without problems when I cross the border and connect using a different ISP with better speeds.
So I really need to replace Hamachi with some other VPN/protocol that handles latency better. The techie managing the repository is not comfortable installing and configuring Apache or IIS, so it looks like HTTP is out. I tried to convince my boss to go for a web hosting company, but he doesn't trust a 3rd party with our source.
Any other recommended options / experiences out there for accessing our SVN repos that would be as simple as Hamachi for setup; but be more tolerant of network latency issues?
Perhaps it's a bit much to ask of your team, but if you have a distributed team then you could switch to a distributed version control system (eg. Mercurial or Git). These don't need to use the network so much and you won't suffer from latency problems. It is an entirely new paradigm though and your team's development processes will have to change, so you might not consider it appropriate in your case.
First I should ask why you need a VPN in the first place. Subversion can operate over HTTPS, so as long as you open the proper port on the server there shouldn't be any security or connectivity issues.
Assuming that you do need a VPN, I find it difficult to believe that an administrator uncomfortable with Apache would be more comfortable installing a whole new VPN system (much more complicated and tricky, in my estimation).
I would like to develop a Network Inventory application that works on any operating system.
Reports on every possible resource attacehd to a network.
Reports all pertinent details of hardware and software.
Thats (and i hate to use the phrase) my "End Game".
However I am running before i can crawl here.
I have no experience of this type of development, e.g. discovering a computers hardware and software settings.
I've spent almost two weeks googling and come up short! :-(.
So I am turning to you to ask these questions:-
My first step is to find an existing open source project i can incorporate into my own code that extracts the fine grained details i am after, e.g. EVERYTHING there is to know about the hardaware and software on a single machine.
Does this project exist? or do i have to develop that first?
Have i got to write all this in C?
I am guessing getting this information about a computer is going to be easier than for printers, scanners, routers etc... e.g. everything else you would find attached to a network.
Once i have access to a single computers details i then need to investigate how i can traverse an entire newtork of printers, scanners, routers, load balancers, switches, firewalls, workstations, servers, storeage devices, laptops, monitors, the list goes on and on
One problem i have is i dont have a 1000 machine newtork to play on!
Is there any such resource available on theinternet? (is that a silly question?)
Anywho, if you dont ask you wont find out!
One aspect iam really looking forward to finding out how to travers the entire network,
should i be using TCP/IP for this?
Whats a good site, blog, usergorup, book for TCP/IP development?
How do i go about getting through firewalls?
How many questions can i ask in one go? :-)
My previous question on this topic ended up with PYTHON being championed as the language/script to go with to develop this application in.
Having looked at a few PYTHON examples they all seemed to be related to WINDOWS networks
and interrogating Windows Management Instrumentation (WMI). I had the feeling you cant rely on whats in WMI, and even if you can that s no good for UNIX netwrks.
Surely there exist common code for extracting hardware and software details from a computer? Why cant i find it on the internet?
Pease help?
Theres no prizes though :-(
Thanks in advance
I would like to appologise if i have broken forum rules or not tried hard enough on my own before asking for assistance.
I just would like to start moving forward with this as its one of the best projects i have been involved with.
I am inspired by the many differnt number of challenges involved and that if i manage to produce a useful application at the end of it it would hopefully be extremely helpful to many people.
That sit
Thanks in advance
DD
as a software vendor of a discovery solution, I can just say: Respect, that you want to start a new one :-). Just in case you are interested in what it could look like: http://www.jdisc.com
Now to some of our experience:
Programming Language:
I wouldn't write it in C. Use Java or .NET. Those languages have great advantages when it comes to tracking down errors or problems. For instance, in Java (and I guess also in .NET), you can see the stack trace when something is failing. For some pieces of code (e.g. WMI access), you might need to use C++ or C (e.g. access to native APIs from Microsoft). Use a native interface or a COM bridge from Java. In .NET, it should even be easier to access the Windows APIs).
Devices:
well, network printers, router, and switches are actually easier to discover. They usually expose their information via SNMP. SNMP is pretty easy to use and pretty robust. Getting information from Windows (or even Unix) systems is a bit trickier. Protocols can be blocked, misconfigured, messed up... We had cases, where WMI was simply hanging when requesting data from a remote device.
Test Devices:
Since we are also a smaller company, we also do not have 1000 different devices to test with. But, there are some things that might help:
a) For SNMP devices use a SNMP simulator. We use MIMIC 9.0 from Gambit Solutions and we are pretty happy with it. You can import SNMP walks from network devices and simulate the device as if it would be in your network.
b) Secondly, use virtualization whenever possible. With VMware, you can install Windows, Linux, or even Solaris. We also use a project called GNS3 to emulate Cisco Routers, Firewalls or Juniper routers.
c)You can test the rest of the devices only, if you have a customer that helps you with testing and implementing new devices.
This are just some ideas to start with. But I have to tell you, that it is not trivial and it takes a lot of time....
Hope that you got some ideas to start with...
I don't know that it's open source, but we use Spiceworks (http://www.spiceworks.com) here as an IT management platform. You may get some use out of exploring that.
I have a lot of people that ask me to fix their computers. Usually it is "slow computer" or "my computer has pop-ups," etc. In other words they have viruses and spyware. I thought I could use a remote program to do it, instead of them brining their computer to me or me traveling to their house..
I thought of UltraVNC, though I'm not sure how I would get them to use it. What I would like to have is a program they can download from my website.
What program would you recommend for this? Remote Desktop? VNC? Something else? I'm happy to pay a small fee if necessary to make things as seamless as possible. Word of mouth is valuable and a good referral for an easy to work with computer person (me) is worth that monthly or one time fee.
I have Vista, most will have Vista Home Premium or XP Home. I have Vista Home Premium and Mac OS X. I can use Linux if necessary. I just don't have it installed right now.
Thanks.
EDIT: Is there an alternative to copilot? I like it but I'm afraid to stake everything on one provider.
https://www.copilot.com/
It's made to be simple so even the most novice computer users can figure it out.
Copilot helps you fix someone's computer problems by letting you connect to their computer, see what they see, and control their mouse and keyboard to help fix the issue.
It's nice because they just go to the site and enter the code you give them. The installation is simple from there.
(Modified)
LogMeIn has a free version that works very well. It runs in the user's system tray and you can login and control their computer as long as they have the program running. The free version has a few less features, but they're mostly luxuries instead of necessities.
Team Viewer is a desktop sharing remote control support tool. It is free for non-commercial, personal use.
There are a few different options:
Remote Desktop: Nice interface, integrates with Windows very well (I had no trouble connecting to my Vista desktop from my XP laptop). I think your client would need to have Windows XP pro; XP home does not have the Remote Desktop Server.
RealVNC: Nice interface, the free version is very useful. Encrypted connections are available with the non-free version.
There are others (like Copilot), but I have only used Remote Desktop and RealVNC.
With either of these, you need to make sure port-forwarding is setup if they have a router, and that the firewall whitelists the program.
Windows XP has built-in "Windows Assist" which lets you send an invite to another Windows machine (typically via e-mail) and allows you to remotely control the machine with them watching. This is a nice option because it is already built into Windows (albeit not as well known as RemoteDesktop or LogMeIn).
The advantage over Remote Desktop is that the user can see what you are doing to their machine and control can be passed back and forth.
This link has the steps to do this.