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How to multicast on different IP network

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Operating Systems HP-UX How to multicast on different IP network
# 1  
Old 10-08-2006
How to multicast on different IP network
Hi, there
On HP-UX, I want to multicast packets on two different IP network repectively.
The two NIC are configured with two different IP. The routes are added with one default and one net for each IP . The multisender programs bind their own local IP, multireceiver programs add the membership with the same multicast address but different port and interface(IP). Normally, the pair of sender and receiver works correctly. When we pull out the network wired that the default route is configured, the multicast packets can not received on two network. However, when we pull out the network wired that do not configured default route, the packets can still be received with the two multireceiver, at this time, one of the IP can not pinged.
So the above test makes the following results:
1. The multicast has nothing to do with the local IP address, it only cares about the multicast address and port
2. The default route decides the multicast packets whether they can send out.

My question is how I can multicast the packets on the different IP network respectively. Once one of the network failed or its wired is pull out, the other network can still multicast normally. That means how I can implementate the dual network multiucasting,thanks.
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LEARN ABOUT ULTRIX

ln

ln(4)							     Kernel Interfaces Manual							     ln(4)

Name
       ln - Lance Ethernet interface

Syntax
       device ln0 at ibus? vector lnintr

Description
       The interface provides access to a 10 Mb/s Ethernet network through the Lance controller.

       The  host's  Internet  address  is specified at boot time with an SIOCSIFADDR ioctl.  The interface employs the address resolution protocol
       described in to map dynamically between Internet and Ethernet addresses on the local network.

       The interface normally tries to use a trailer encapsulation to minimize copying data on input and output.  This	can  be  disabled  for	an
       interface by setting the IFF_NOTRAILERS flag with an SIOCSIFFLAGS ioctl.  Trailers are only used for packets destined for Internet hosts.

       The  SIOCSPHYSADDR ioctl can be used to change the physical address of the Lance.  The SIOCRPHYSADDR ioctl can be used to read the physical
       address of the Lance.

       The SIOCADDMULTI and SIOCDELMULTI ioctls can be used to add or delete multicast addresses.  The Lance recognizes a maximum of 12  multicast
       addresses.

       The  SIOCRDCTRS	and  SIOCRDZCTRS ioctls can be used to read or ``read and clear'' the Ethernet driver counters.  The argument to these two
       ioctls is a pointer to a counter structure, found in

       The SIOCENABLBACK and SIOCDISABLBACK ioctls can be used to enable and disable the interface loopback mode respectively.

Diagnostics
       The diagnostic error messages contain relevant information provided by the Lance.

       ln%d: can't handle af%d
       The interface was handed a message with addresses formated in an unsuitable address family, and the packet was dropped.

       ln%d: memory error (MERR)
       A memory parity error has occurred.

       ln%d: lnalloc: cannot alloc memory ...
       The driver was unable to allocate memory for internal data structures.

       ln%d: initialization error
       The driver was unable to initialize the network interface.

       ln%d: SIOCADDMULTI fail, multicast list full
       Too many multicast requests have been made.

See Also
       arp(4p), inet(4f), intro(4n)

																	     ln(4)