Issues Related to Receiving Multicast Data

In most cases, the absence of multicast data is caused by network-related configuration issues described below.

Firewall Blocks Program and GettingStarted Sample

Updating firewall rules or simply turning it off usually solves the issue.

Note: Disabling the firewall explicitly may be dangerous. Consult your network and system administrators before turning off the firewall.

Linux-like Operating System Turns on Reverse Path Filtering on Network Interfaces

Disabling reverse path filtering by updating system control parameters usually resolves the issue.

System control parameters (/etc/sysctl.conf) affecting reverse path filtering:

Parameter	Description
net.ipv4.conf.default.rp_filter	Defines default policy
net.ipv4.conf.<NetworkInterface>.rp_filter	Defines policy for a NetworkInterface network interface

To determine the current status of reverse path filtering, run the command below:

sysctl -a | grep rp_filter

To disable reverse path filtering from the console, run the following command:

echo 0 > /proc/sys/net/ipv4/conf/<NetworkInterface>/rp_filter

Explicit Network Interface Must Be Specified

The GettingStarted sample program configures the Handler to listen to market data on all network interfaces on Windows and Linux. If the network configuration specifies an exact network interface (e.g., eth0 on Linux) for market data listening, then the HandlerSettings::networkInterface parameter must be updated accordingly.

More Information

Check network connectivity using the telnet utility Explains how to use the Telnet program.
Multicast Issues Uncovers various multicast issues.
Multicast Test Program Explains how to use the MulticastTest program.
Multicast Tunnel Proxy Explains how to use the Multicast Tunnel Proxy program.

More information can be found in our Lost multicast packets troubleshooting guide.