Inner Contents
	Check network connectivity using telnet utility

	Multicast Issues

	Multicast Test Program

	Multicast Tunnel Proxy

Detailed Description

Issues Related with 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 firewall explicitly may be dangerous. Consult your network and system administrator before turning the firewall off.

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 current status of reverse path filtering run the command below:

sysctl -a | grep  rp_filter

To disable reverse path filtering from console run following command:

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

Explicit Network Interface Must Be Specified

GettingStarted sample program configures the Handler to listen to market data on all network interfaces on Windows and Linux. If network configuration supposes specifying exact network interface (like eth0 on Linux) for market data listening, then OnixS::ICE::iMpact::MarketData::HandlerSettings::networkInterface parameter value must be updated accordingly.

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