I have a list of VPN server credentials I could use to connect to the Internet.
I want to test each server's speed of upload/download.
One option is to make a script to connect to each VPN server and transfer a couple of files back and forth to get the average upload/download speed.
But this method is slow and time consuming(since I need to wait for the VPN client to connect to the VPN server). Is there any quicker way to test VPN servers speeds or maybe improve my current method?
Make Your VPN server as Iperf Server and check the vpn server speed on single and parallel connections with iperf client available on multiple platforms.
Read the Docs for more
https://www.linode.com/docs/networking/diagnostics/install-iperf-to-diagnose-network-speed-in-linux/
however it is recommended to take speedtest after vpn connection as Encryption and bad configuration can also degrade speed.
Related
I would like to test the send/receive metrics when connected via a VPN using the JMeter tool then compare the results when not connected to the VPN. Would appreciate any thoughts on this subject.
I don't think there is something you have to do from JMeter perspective as traffic routing is the job for the VPN client so it should be sufficient just to execute the test 2 times:
1 test when the VPN connection is down
2 test when the VPN connection is up
The results can be compared using Merge Results Tool
If for some reason your VPN client doesn't pick up the traffic from JMeter to your application due to its configuration you can force JMeter to use your VPN network interface as the source IP address, the setting lives under "Advanced" tab of the HTTP Request Defaults configuration element
i have a big problem. I need tranfer a lot of files by a server to another server, but the second server isnt a local server. If i tranfer by a local server i cant 100mbs but if i send for another server out the speed is 2mbs. my network is 1gbs. I use a command line 7z.
If your servers are (as you wrote) on the same network and connected through the same line you are most likely to have a network connection problem.
I've often seen that the duplex settings of network cards are not set up correctly which leads to a lot of collisions.
Check your network card settings and try to force for example 100mbps full duplex.
I work for a company where this happens daily when trying to connect IBM network cards with Cisco switches. Have a look here how to set up duplex settings: https://superuser.com/questions/86581/how-do-you-check-the-current-duplex-value-of-a-network-card-set-to-auto-negotiat.
If this doesn´t help you might be better off asking at superuser.com
I'm using BOOST-ASIO for a simple echo client-server (there is a separate link for the client and server). When I try to run the server I use this async_tcp_echo_server 4000. For the client I use blocking_tcp_echo_client #.#.#.# 4000 (with #.#.#.# as the ip address). I'm on XP-SP3 with my computer connected to my wireless dsl modem using a usb card. After a few seconds on the client side I get this error:
Exception: connect: A connection attempt failed because the connected party did
not properly respond after a period of time, or established connection failed be
cause connected host has failed to respond
Any ideas what it could be? I turned off my firewall including the windows firewall and still I get no response. Could my port be in the incorrect range? Do I need to include a computer name to specify the machine on the network( there are other machines on the network sometimes active)? I did try running this on another computer directly connected to the dsl modem and same issue. I did ping my address and that did work for 4/4 packets.
It could be a variety of issues. Thus, it can be worthwhile to use lower level networking tools, such as netcat to serve a port on the server, and try connecting with netcat from the client side. This can help simplify the problem by removing any potential problems introduced by an application's network programming code. If the problem is identified as being a network issue, then there are a few things to check:
Verify firewall exceptions on the server.
Verify firewall exceptions in the server's network gateway.
If the server and client are on different networks, with the client trying to connect to the server's external IP, then verify that the server's gateway knows what traffic to route to the server. This may require setting up rules, such as port forwarding, in the routing device.
If the server and client are on the same network, but the client is trying to connect to the server through the network's external IP, then verify that the gateway supports looping back internal traffic destined to the external IP.
Use a network analyzer tool, such as Wireshark, to verify that the time to live field in the packets is high enough that it will not be discarded.
you could try
$ telnet server-ip 4000
from your client and see if it is possible to establish the tcp connection.
I'm running a websocket server (command line program) off port 9000 on a Windows 2008 server. I can't seem to figure out why it will not accept more than about 600 concurrent connections. Testing on my local machine, I can create thousands of concurrent connections. But on the server, I get the following error after about 600:
No connection could be made because the target machine actively refused it
I have tried adjusting registry entries for the max port number, and turning off the firewall to no avail. I have also tried a different websocket server implementation. Is there some other setting I need to change?
edit: I tried this on a Linux server as well with the same problem.
I found the problem:
It seems to be my client side internet connection. By running the same tests on a different network from the client side, I can create thousands of connections.
If I create a c++ server/client application, the port I used to communicate does it need to be open on the router of the server and client machine
Or what other approach could I take? the client computer needs to receive information from the server but I am not able to have any ports opened because it is on a school network....
[edit]
Hmm My setup is a php page running on a server say when I press hello, the server makes a ssh connection through php and sends shell commands to the machine. The server is running off of a school server which I do have ssh access to and run all my things from there. The client computer will be my pc running off of the school wifi which is not connected to the server. The server will try to make a ssh connection to the public ip of my computer running off of the school wifi(no ports open/can ssh out but no ssh in). Will these methods you mention make this possible, in particular the connect.c since I can't run putty off of the server, and the connect.c I could call from the php.
The choice of language is highly irrelevant here.
There don't need to be ports 'open' on any router, unless your traffic must pass through it. On normal peer hosts in the same network (or subnet) there would hardly be any firewall policy, not even in schools.
Technically it is possible for the switch to block peer-2-peer traffic (meaning traffic not destined to the outgoing gateway), but that is not very usual.
Of course, if the school doesn't allow outbound (WAN) traffic on most ports, tough luck, and they're absolutely right :)
You can look at
ssh (with tunnels -L, -D and -R options, perhaps -o GatewayPorts on)
stunnel
connect.c
http-tunnel
All very readily googled
To establish a TCP/IP connection, only the server port needs to be accessible by the client. The connection is full-duplex, therefore data can flow from the client to the server and vice-versa.
If you are using UDP for your application, which is a connection-less protocol, what happens depends heavily on the firewall or router and whether it performs connection tracking for your service or not.
Unless you provide some additional information on your service and the network setup on both the client and the server side, we cannot provide more concrete information.