When source address field is empty, all runs fine. When I put in an IP, even if it is my actual IP, I get an error:
Response code: Non HTTP response code: java.net.SocketException
Response message: Non HTTP response message: Network is unreachable: connect
I run Windows... Also I have already tried all the Implementations.
There should be few pre-requisites met:
You need to have HTTPClient implementation (see HTTP Request sampler documentation)
Source address field[Only for HTTP Request with HTTPClient implementation]
In case of single IP address:
The IP address needs to be available in the underlying operating system, it may be either IP associated with NIC or an IP alias
Relevant Source address type needs to be specified, in case of single IP it should be IP/Hostname
See Using IP Spoofing to Simulate Requests from Different IP Addresses with JMeter guide for more detailed information on the domain.
Related
Researching on how a server can figure out a client's IP address, I see that one needs to inspect the X-Forwarded-For header chain.
I understand that the client, ISP, and then routers and proxies declare their IP addresses there.
However, the server handler also has access to req.RemoteAddr field to read the client's IP address. How is that RemoteAddr determined exactly? Is it based on a specific header in the request? If yes, which one(s)?
I have tried inspecting the usage of the field and how it is set but the implementation details are hidden behind an interface.
The net/http server sets RemoteAddr to the string form of the network connection's remote address. The string is typically in the format "IP:port".
In the case of a TCP connection (the typical scenario), the network connection remote address is taken from the IP source address and the TCP source port.
The address can be the address of the client or a proxy.
The net/http server does not consider the headers when setting RemoteAddr.
I am trying to implement https support for my GCP VM. For the purpose, I created all the load balancing components i.e. instance group, health check, backend service, url map & target proxy. All were created without error.
However now when I am creating a global forwarding rule for the final step, I am getting the following error:
ERROR: (gcloud.compute.forwarding-rules.create) Could not fetch
resource:
- Invalid value for field 'resource.IPAddress': '35.xxx.xxx.xxx'. Invalid IP address specified.
I am using the following command:
gcloud compute forwarding-rules create fa-global-fwding-rule-1 --target-https-proxy=fa-https-proxy-1 --ports=443 --global --address=35.xxx.xxx.xxx
(IP add digits masked with xxx)
What am I missing?
I already have a working VM instance through http where I had promoted its ephemeral address to a static address (above is the same address 35.xxx.xxx.xxx)
Also once I implement https support, I want the http connect to continue working as well so that my existing apis are not disturbed until I move them to https
Any advice/help?
GCPs Load Balancer does not check to see if the static IP you picked was regional or global. If you accidentally reserved a "regional" IP instead of a "global" IP, it throws that silly error:
Invalid value for field 'resource.IPAddress': '35.xxx.xxx.xxx'.
Invalid IP address specified.
I don’t find any issues with your command, this kind of error is mostly observed due to IP conflict if the specified IP address is in use or not available. The Forwarding Rules map the IP address for your load balancer to the Target Proxy that will handle the requests.So first you will need to create your IP address though. Using this command:
$gcloud compute addresses create my-address --global
And then create a forwarding rule. You will need a global, rather than regional, IP address for your HTTPS load balancer. Using this command :
$gcloud compute forwarding-rules create my-https-forwarding-rule --global
--address 123.123.123.123 --ip-protocol TCP --port-range 443
--target-https-proxy my-https-proxy
Can you confirm if you are using a global or a regional IP address?
For HTTP, You need to create a totally separate Target HTTP Proxy and Forwarding Rule for HTTP. You essentially need to have two load balancers to handle the traffic, and then actually redirect users in your application. Notice that we put the same IP address in for the HTTP Forwarding Rule. This makes it so that we can listen on port 80 and on port 443 at our IP address.
I am trying IP spoofing in JMeter HTTP requests but my public IP is going to the request, not the IP address which I have specified under advanced option in HTTP sampler. can anyone help me in this?
I am also sharing the screenshot of my test plan.
here
In my test plan my let's say my IP is x.x.x.x and the IP which I have configured for IP spoofing is: 192.168.23.12 as shown in the screenshot but request to the server is still going with my IP which is x.x.x.x.
Can anyone help me out in this?
As per HTTP Request sampler documentation
Source address field [Only for HTTP Request with HTTPClient implementation]
So change "Implementation" to HttpClient4 and it should start working as expected.
Also be aware that you need to have this IP address (or alias) defined in the underlying operating system.
See Using IP Spoofing to Simulate Requests from Different IP Addresses with JMeter article for more information and configuration instructions for different operating systems.
Please check the below test plan:-
I'm trying to use Fiddler to capture traffic that comes to my machine on its external ip address, and redirect it to the loopback interface without affecting the host header.
I have added the following to the OnBeforeRequest method:
if (oSession.HostnameIs("MyMachineName")){
oSession.bypassGateway = true;
oSession["x-overrideHost"] = "localhost";
}
This works fine for http traffic: I do indeed see a request to http://MyMachineName hit the loopback adaptor with its host header intact.
However, when intercepting https traffic I get the following in the response raw view:
fiddler.network.https> HTTPS handshake to auth.time-wise.net failed. System.IO.IOException The handshake failed due to an unexpected packet format.
I have Fiddler configured to capture and decrypt https traffic.
Does anyone know why this problem occurs and how it can be remedied?
Edit: in response to Eric's request for more information
Fiddler is running as a proxy (i.e. as standard), listening on port 8888.
The clients are (currently) web browsers on the same machine, and so are automatically using the Fiddler proxy, as they've picked up the change in default proxy.
You've left out some important details (e.g. what port is Fiddler running on, and how did you configure the remote client to send its traffic to Fiddler?)
Having said that, you will probably want to change your use of x-overrideHost to x-overrideHostname such that the port number of the traffic being retargeted is preserved.
http://ipfuck.paulds.fr/
We've been recently getting hammered by this Firefox plug-in. It sends a fake IP in the headers so when our nginx web server picks up the IP it is a fake one.
Is there any way to get a real IP address or block out requests that have this plug-in installed?
There is actually no client IP entries in any HTTP Headers. There are only some un-official proxy headers which are added to a request, so that a proxy server can tell you the real ip of the connecting client (since the tcp socket will only reveal the IP address of the proxy server).
The plugin you linked to adds those proxy headers, to "fake" a proxy request, by adding a X-Real-IP: 1.2.3.4 or X-Forwarded-For: 1.2.3.4 header to the request. But no one forces you to use that IP address (which can be fake, like the 1.2.3.4 example here), you can always use the IP address of the socket that initiated the connection - which will be the client's real IP address if he uses the mentioned plugin.
Within the location section of your nginx configuration, you get the socket IP address through the $remote_addr variable. To retrieve the "fake" IP address, you can use $http_x_forwarded_for or $http_x_real_ip variable.
If you are using any application/cgi backend, you usually can examine the full headers and the socket IP address (i.e. in PHP you should check $_REQUEST and $_HEADERS variables)