I am using dcmtk for PACS server process. here I am using dcmqrscp exe . In that exe dcmqrscp.cfg file contain detail about hosttable , aetitle table and vendor table. In this hostable i am create one Ae title . Now my question is Shall i use a single aetitle from different ipaddress ?
See Part 8, Page 46 of the DICOM Standard, Network Communication Support for Message Exchange. Link to document
A single Application Entity Title can be associated with multiple network addresses assigned to a single
system (e.g., multi-homed host).
A single Application Entity Title can be associated with multiple TCP Ports using the same or different
IP Addresses.
A single network access point (IP Address and TCP Port) can support multiple Application Entity Titles.
The only problem that I see, Karthick, is the response to a C-MOVE based retrieve where the destination is an AETITLE.
If there is various IP associated to the same aetitle, wich destination IP address wil be used to send the requested images?
Related
I'm using ForcebindIP to point an app at a specific network adapter, like this:
forcebindip -i 192.168.0.5 MyCSharpApp.exe
This works fine and the app isn't aware (or doesn't access) any of the other network adapters on the PC.
Is it possible to restrict ForceBindIP to outbound traffic only leaving the app to receive data from any local network adapter? Or even to specify a network adapter for outbound and another for inbound traffic?
I can't find an extra startup parameter for ForceBindIP that does this.
I'd appreciate any help with this.
If I get your problem correctly, you want to bind your application to listen for packets on all available interfaces but return packets to only through one given interface. I also assume it's a server application and you don't have neiter source code nor control over its behaviour.
Disclosure: I do not know how ForceBindIP works internally, I'm basing my understanding of it on this passage from the website:
it will then inject a DLL (BindIP.dll) which loads WS2_32.DLL into memory and intercepts the bind(), connect(), sendto(), WSAConnect() and WSASendTo() functions, redirecting them to code in the DLL which verifies which interface they will be bound to and if not the one specified, (re)binds the socket
Problems to overcome
I don't believe your desired configuration is possible with just one application level DLL injector. I'll list a few issues that ForceBindIP will have to overcome to make it work:
to listen to a socket, application has to bind() it to a unique protocol-address-port combination first. An application can bind itself to either a specific address or a wildcard (i.e. listen on all interfaces). Apparently, one can bind to wildcard and specific address simultaneously as outlined in this SO question. This however will be two different sockets from the application standpoint. Therefore your application will have to know how to handle this sort of traffic.
When accepting client connection, accept() will create a new socket and parameters on that are managed by Windows, I don't believe there's an API to intercept binding here - by this time the connection is considered established.
Now imagine, we somehow got a magic socket. We can receive packets on one interface and send to another. The client (and all routing equipment on the way) will have to be aware that two packets originating from two different source IP addresses are actually part of the same connection and be able to assemble the TCP session (or correctly merge UDP streams).
You can have multiple gefault gateways with different priorities and rules (which is a whole different topic to explore) but as far as I'm aware that's not going to solve your particular issue: majority of routing protocols assume links are symmetric and expect packets to keep within same interface. There are special cases like asymmetric routing and network interface teaming but they have to be implemented on per-interface level.
One potential solution
One way to achieve what you're after (I don't know enough about your environment to claim it will work), will be to create a virtual interface, set it into yet another IP network, bind your application to it, then use firewall (to, say, allow multicast backets into the "virtual" network) and routing from that network to required default gateway with metric set to 1. I also suspect just any Windows will not be that flexible, so you might need like a Server Edition.
I am sorry this didn't turn out to be the ready-to-fly solution, I however am hoping this gives you more context to the problem you are facing and points you into other directions to explore.
You can use Set-NetAdapterAdvancedProperty command in Powershell to set the flow control of your specified adapter
To get the names and properties of all the network adapter :-
Get-NetAdapterAdvancedProperty -Name "*"
Suppose you want the network adapter named "Ethernet 2" to be only used to receive data from internet then type :-
Set-NetAdapterAdvancedProperty -Name "Ethernet 2" -DisplayName "Flow Control" -DisplayValue "Rx Enabled"
You can find more in :
https://learn.microsoft.com/en-us/powershell/module/netadapter/set-netadapteradvancedproperty?view=win10-ps
Microsoft winsock example has a usage in their example for limiting a socket to only send or receive mode. It might help.
https://learn.microsoft.com/en-us/windows/win32/winsock/complete-client-code
Outbount and Inbount limits are not imposed while binding. But latter or when connection is established.
Line of code pertaining to this in client code is toward the end.
// shutdown the connection since no more data will be sent
iResult = shutdown(ConnectSocket, SD_SEND);
I am using RTI DDS 5.2.3.17 and would like to get the IP address of the DataWriter/Publisher to add to some log messages.
How would I go about doing this I am having some trouble in just forming the logic of what to do?
Accessing the IP address of a DataWriter is not possible in a standardized way. However, the RTI Connext implementation by default uses the IP address as part of every Entity's Globally Unique Identifier (GUID).
You can find more information about GUIDs and how to access them in the RTI Knowledge Base article Accessing the GUID of Connext DDS Entities. Normally, the IP address is captured in the first 4 bytes of the GUID, indicated by rtps_host_id in the DDS_GUID_t diagram.
You did not explain your situation in too much detail, but if you happen to have data available coming from the DataWriter, you could also leverage the SampleInfo that comes with the data. It has a field called source_guid.
All of this is assuming you are looking for the IPv4 address. Also note that this is not a publicly exposed mechanism, so things might change in the future. And all of this breaks at the moment that your application explicitly sets its GUID.
The DataWriter GUID is not a reliable way to get the IP address of the DomainParticipant. More recent versions of Connext DDS no longer construct the GUID_t from the IP address or the host ID.
A right way is to look at the ParticipantBultinTopicData of the DomainParticipant that owns that DataWriter. The field default_unicast_locators contains the IP addresses of the DomainParticipant.
You can get the ParticipantBultinTopicData of the DomainParticipant that owns the DataWriter that wrote a sample from theSampleInfo. To do this call get_matched_publication_participant_data() on the DataReader passing the publication_handle that is found in the SampleInfo.
Note that the above gets you the IP addresses (Locators) of the DomainParticipant that owns the DataWriter. It is possible for a DataWriter to override those and provide a different set (normally a subset). This probably does not matter if you just want to provide logging. But if you wanted to see if the DataWriter uses a different set of Locators you can also get those from the unicast_locators field in the PublicationBuiltinTopicData which you can also get from the SampleInfo calling get_matched_publication_data().
I have a Mule application with a HTTP endpoint. I wish to only allow requests coming from a particular set of IP addresses to access the flow. How do I restrict it? Which filter should I use? I am saving the IP addresses in a file inside the application. If a custom filter is used, how should it be written?
If you are using Mule EE, the Anypoint Filter Processor can be used to filter inbound requests dependant on the IP address.
Generally positioned immediately after an inbound connector in a Mule
flow, the Anypoint Filter Processor evaluates two message properties,
then rejects the message if the values fall outside of its configured
parameters. The properties that are evaluated are:
IP address – If the IP address of a message falls outside the filter’s
configured IP address range, Mule does not process the message (see
image below).
Creation timestamps — Where the message’s creation date
and time fall outside the filter’s configured acceptable lifespan
(i.e. the message is older than expected), Mule does not process the
message (see image below).
The full documentation can be found here.
Alternatively, if you are using CE, the link in my comment on the original question may help.
I was reading tod lammales CCNA study guide 6th edition and stumbled upon this,
One thing to remember is that if multiple hosts are communication to
the server using HTTP, they must all use a different source port
number.That is how the web server keep the data separated at the
transport layer. page 337
Can this be true ? Because i always thought Ip and port number makes a unique endpoint at TCP layer, but according to this even for incoming connections from different source IPs, source port must be different ! appreciate your ideas.
No it isn't true. But what you said isn't true either. TCP connections are identified by the tuple {local address, local port, remote address, remote port}, not by any one of those, or two. What you have quoted, if accurate, would be (a) complete nonsense and (b) entirely unimplementable. How are all those clients going to co-ordinate amongst themselves to always use different source ports?
I have requirement where I need to send Flat file data to multiple customers.
One way is to create Send port for each of the customer and put a filter on the port to send the data specific to the Customer ID.
Now problem that I see is that customer will increase in coming days for sure so creating a new port for each customer is not a big deal but still I looking for some dynamic approach.
Can this be done with some kind of dynamic configuration for a single port?
You could use a Dynamic Send Port. This will give you the possibility to either use information in the message to configure the destination of the port run time. Another way is to have a database where you use some sort of customer id in the message to look up the destination and use that to configure the send port run time.