I've created a receive location using the HL72x pipeline with MLLP. I can send hl7 traffic to the server if I set the BizTalk MLLP configuration host property of the receive location to the IP address of the server, but if I set the value to localhost or 127.0.0.1, biztalk will not appear to listen on the respective port. Using a port scanner, I can only see an open port if the mllp host property of the receive location is set to the IP address of the server. I don't want to reference the actual ip address of the server, I'd rather us local host, as then if the IP changes, nothing has to be reconfigured. Is there some other way to do this?
You should be able to set the Host parameter to an IP address of 0.0.0.0. That will cause the receive location to listen for all inbound traffic on the specified port, regardless of the source's IP address.
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I want to establish communication between server and client with mpich-3.2, however the MPI_Open_port always open port on 127.0.0.1 so that the client cannot connect to server. Are there any solutions to changing the IP address?
How I can configure the sonar.web.host with a dynamic IP? Would I need to change the properties file every time the IP changes?
# Binding IP address. For servers with more than one IP address, this property specifies which
# address will be used for listening on the specified ports.
# By default, ports will be used on all IP addresses associated with the server.
sonar.web.host=xxx.xx.xx.xx
Leave sonar.web.host commented-out and SonarQube will listen on all NICs, irrespective of their IP address.
I read on Ports WIKI page that "Ports are logical constructs which identifies a service or process", what service or process means here? It means protocol like HTTP, FTP etc. or software applications which are configured to listen on that port?
When it is said that application is listening on so and so... then does it listen for request to an IP address or a port, or listens on a combination of port and IP address? Application listen for a specific IP address and one or more ports are bound to it OR it listens for a combination of IP and port?
For example, I can have application configured for 7001 for HTTP requests and 7002 for HTTPS requests. So, would be listening on 7001 or what?
Applications/services such as a HTTP web server or an FTP server are assigned a port to use/listen on, usually in the config of the application. and they often use a standard port. HTTP for example usually uses port 80.
If an app/service is listening it listens to a port and has no relation to a specific IP address. This is because the IP address it is listening on is the IP address of the computer that the app/service it is running on.
I'm setting up 4 servers that each have RESTful APIs that go over HTTPS. Because we're in the early stages of a startup, I'm going to host these in my closet.
I have business-class Comcast service, so I can get a static IP address or a series of them. The IP addresses are $10/ea per month, so I can save about $30 if I get just one. I realize this sounds like I'm being super cheap, but we're pinching pennies until we get some customers.
We will probably use one server as a "tools" server that will allow us to reach the other servers via SSH; the other 3 servers will need to have HTTPS open to the internet on the LAN.
I'm considering getting one static IP address, and then using my router to forward HTTPS traffic to the various servers. The port forwarding would look something like:
WAN Port LAN Port Server
22 22 Tools
1443 443 Server 1 (API via SSL)
2443 443 Server 2 (API via SSL)
3443 443 Server 3 (API via SSL)
I would then set up A NAME records in my DNS that would be:
tools.mydomain.com -> <static IP address>:22
server1.mydomain.com -> <static IP address>:1443
server2.mydomain.com -> <static IP address>:2443
server3.mydomain.com -> <static IP address>:3443
Is this a reasonable approach? Will it work?
You cannot direct traffic to a specific TCP port with DNS records. You can only point at an IP-address. The client by default uses tcp port 80 for HTTP and port 443 for HTTPS (unless you explicitly name the port to use in the URL).
Furthermore you cannot have multiple HTTPS-based hosts using the same IP address unless they also use the same SSL certificate. That is because the SSL handshake takes place before the client reveals to the server which hostname it was trying to reach, so the server can only give out an SSL certificate based on the IP address (and port) that was connected to.
In this particular instance, if you have four servers that actually have the same domain, you can get a wildcard SSL certificate (i.e. it covers *.mydomain.com) and then you can actually get away with one single public IP address for all four servers. Just point all DNS records to the same IP address and then you have the server give out your wildcard certificate which is valid regardless of which hostname the client is using. After the SSL handshake is thus completed, the server can look at the Host: -header in the client request to determine which server the request was actually intended for, i.e. you have one server acting as the HTTPS-endpoint where all HTTPS-requests are received and then internally forwarding to unencrypted request to the correct server (or handle all servernames virtually by one physical server).
If you are using Apache HTTP server I suggest you read about name-based virtual hosts and proxy forwarding:
http://httpd.apache.org/docs/current/vhosts/name-based.html
http://httpd.apache.org/docs/current/rewrite/vhosts.html
http://httpd.apache.org/docs/current/rewrite/proxy.html
On localhost a program is calling an external IP in a specific port. I'm monitoring this via wireshark. Standard TCP connection.
What's the easiest way to route the traffic to the external IP back to localhost on a specific port?
Thanks
Configure your network card to have a second IP address - the external one.
When the IP packet gets routed, it turns out that it needs to be delivered locally.
If you listen locally to any address, you'll pick it up.
Alternatively you can listen locally to the specific IP address.