multicast

Why DataWriter::write() execution time can grow with local multicast subscribers

Summary On Linux/Windows and potentially other operating systems, when a DataWriter sends data samples to a multicast address, the performance of the underlying UDP sendmsg() call varies depending on whether multicast DataReaders are located on the same local host. If there are no local, multicast ...
grayson
Fri, 08/01/2025 - 15:51
210 reads — 0 comments

Why do I see error 0x69 when using the multicast_mapping QoS?

When using the multicast_mapping QoS, you may encounter this error: NDDS_Transport_UDP_share_recvresource_rrEA:setsockopt(ADD_MEMBERSHIP) error 0X69 This error usually indicates that you've exhaused the kernel parameter called igmp_max_memberships on Linux-like operating systems. The default for ...
grayson
Wed, 08/14/2024 - 10:21
1196 reads — 0 comments

Why is Connext Micro logging [Module: 4, Errcode: 215]?

By default, RTI Connext Micro will let the Network stack select the interface that will be used to receive multicast traffic. This is done by simply using INADDR_ANY (which translates to 0.0.0.0) when setting the socket option to join a multicast group (that is IP_ADD_MEMBERSHIP). While this works ...
aromero
Mon, 04/01/2024 - 01:13
1443 reads — 0 comments

Disabling Multicast in Micro

There are three steps to take to configure Connext Micro not to use multicast. Set disable_auto_interface_config to true. Micro will scan the system for available interfaces and use them. Note, however, when this is set to true, Micro relies on just the manually added interfaces. Add an interface ...
AnthonyD
Tue, 06/06/2023 - 16:35
2147 reads — 0 comments

Does Endpoint Discovery use unicast or multicast?

Endpoint Discovery uses either unicast or multicast, depending on the situation. First, some background: Endpoint Discovery is the process used by endpoints (that is, DataReaders and DataWriters ) to locate each other before they can begin to communicate user data. When a DomainParticipant is ...
samr
Tue, 12/18/2018 - 09:52
8780 reads — 0 comments

Multicast for data transfer, for applications on the same node

Multicast over UDPv4 can be used for data transfer between applications that are running on the same machine, even if shared memory is enabled. RTI's Connext DDS provides various transports, which can be configured using the USER_QOS_PROFILES.xml file. The most commonly used transports are shared ...
chirags
Mon, 10/16/2017 - 16:08
5341 reads — 0 comments

Why does DDS communication stop after some time while using switches?

RTI Connext DDS uses multicast for the discovery process in the default setting. When a host needs to join a multicast group, the network stack of the host sends out an IGMP Membership Report message also known as the join message. These messages are forwarded through the LAN to the local IGMP ...
harish
Mon, 04/06/2015 - 14:53
9622 reads — 0 comments

For a same topic ‘T’, how many copies of a sample (data) are sent from one DataWriter (DW) to many DataReaders (DR)

In short, by default, one copy of a sample is sent per transport locator, where a transport locator uniquely identifies a transport-level destination and is composed of <transport class>://<transport address>: <communication port> . For example, for UDPv4 a transport locator could ...
Ashish
Fri, 08/30/2013 - 12:12
8708 reads — 0 comments

How do I set the multicast_receive_addresses when using rtiddsping and rtiddsspy?

Note: Applies to RTI Data Distribution Service 4.3x and above, Both rtiddsping and rtiddsspy can be configured to use multicast for discovery announcements by specifying a multicast address as part of the initial peer list (using -preer <PEER> ). However, rtiddsping and rtiddsspy do not have ...
vishal
Thu, 01/17/2013 - 13:01
6999 reads — 0 comments

What do 'setsockopt ADD_MEMBERSHIP' errors mean?

This message can be recieved when creating a new reader listening on a multicast group: setsockopt(ADD_MEMBERSHIP) error 0X62 The hex code may differ across platforms — EADDRINUSE is 98 on Linux, 125 on Solaris — check your system's errno.h to be sure. RTI middleware can share receive-resources ...
gianpiero
Thu, 01/17/2013 - 12:28
7131 reads — 1 comment

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