Unable to use multicasting with NetRAIN

[Chris Bunney]

Hi,

I'm using some in-house s/w that uses IP multicasting between our Tru64 servers and NT clients.

The network is designed to be hardware redundant; there are 2 switches, 2 routers etc. and 2 servers each with a single ethernet adaptor (yes - I realise this is a single point of failure...) containing 2 interfaces.

Although the server s/w successfully uses multicasting, as soon as I configure NetRAIN to provide redundancy over the 2 ethernet interfaces, the multicasting fails. The diagnostic message output by the s/w indicates that it can't join the multicast group.

The ifconfig setup I used is as follows:

ifconfig ee0 delete
ifconfig ee1 delete
ifconfig ee0 down
ifconfig ee1 down
ifconfig nr1 add ee0,ee1
ifconfig nr1 inet

NetRAIN by itself works fine (tested by ping'ing the server from a client and adding/removing ethernet cables from the server), and our multicasting s/w by itself works fine, but the two don't work together.

Does anyone have experience of this kind of configuration? Is there some configuration I'm missing? I'm not familiar with multicasting or NetRAIN, so any advice will be welcomed.

[Ralf Puchner]

There are no restrictions regarding multicast and netrain. What version of Tru64 are you using - it is difficult to guess.

Have you tried other multicast software as well (maybe it is a problem in your source) and have you configured the switches for netrain use?