Symptom:
How can I troubleshoot a multicast transfer error on UNIX computers?
Solution:
The UNIX utility, mtrace, helps with multicast troubleshooting. For specific information about the features of this utility and instructions for using it, see the documentation and online help for the specific UNIX platform and release you are using.
The mtrace utility prints the multicast path from a source to a receiver. mtrace uses a tracing feature of multicast routers classified as mrouted. You can access this feature through an extension to the Internet Group Management Protocol (IGMP). The mtrace utility runs a hop-by-hop trace query along the reverse path from the receiver to the source. It collects hop addresses, packet counts, and routing error conditions, and returns the results to the requestor.
For the exact syntax, see the man page for the specific UNIX platform and release you are using. Your syntax is similar to the following example.
Example
mtrace [ -g gateway ] [ -i if_addr ] [ -l ] [ -M ] [ -m max_hops ]
[ -n ] [ -p ] [ -q nqueries ] [ -r resp_dest ] [ -s ] [ -S stat_int ]
[ -t ttl ] [ -v ] [ -w waittime ] source [ receiver ] [ group ]
The only required parameter is the source host name or address.
UNIX and Microsoft Utilities Note: Most diagnostic and configuration utilities are hardware-specific. The UNIX or Microsoft utility discussed here is provided with certain versions of the corresponding operating system. For further information and support regarding utilities for computers, routers, switches, and networks, see the vendor's online help and documentation.
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