Re: PPP & Multicast

["Jens B. Jorgensen" <jjorgens@bdsinc.com>]

That's strange. All my ppp interfaces have multicast set on the interface. In fact,
ppp.c shows:

static int
ppp_init_dev (struct device *dev)
{
        dev->hard_header_len  = PPP_HDRLEN;

        /* device INFO */
        dev->mtu              = PPP_MTU;
        dev->hard_start_xmit  = ppp_dev_xmit;
        dev->open             = ppp_dev_open;
        dev->stop             = ppp_dev_close;
        dev->get_stats        = ppp_dev_stats;
        dev->do_ioctl         = ppp_dev_ioctl;
        dev->addr_len         = 0;
        dev->tx_queue_len     = 10;
        dev->type             = ARPHRD_PPP;

        dev_init_buffers(dev);

        dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;

        return 0;
}

So it would *always* get set. What kernel are you running?

"Stephen A. Witt" wrote:

> I'm trying to figure out how to do multicast IP over PPP. More
> specifically, how to get the MULTICAST interface flag set for a PPP
> network interface. I searched through the mailing list archives and found
> no direct answer to my question, but I did find numerous examples that had
> been sent in of 'ifconfig' output that showed the MULTICAST flag being set
> for a PPP interface. My expectation was that if multicast support was
> compiled in to the kernel, then the network interfaces would have the
> multicast flag set. My Ethernet interface has its multicast flag set for
> instance. I've looked at the multicast and ppp howto's, read some code in
> the kernel, read the net-3 howto, etc., looked through all the /etc/init.d
> files for this and haven't been able to find anything.
>
> I'm using kernel 2.0.36, with the following kernel options set:
>
> Network firewalls: yes
> Network aliasing:  yes
> TCP/IP networking: yes
> IP forwarding/gatewaying: yes
> IP multicasting:   yes
> IP firewalling:    yes
> IP masquerading:   yes
> IP tunneling:      yes
> IP multicast routing: yes
>
>   among others.
>
> Can anyone give me a lead to investigate this?
>
> Thanks...
>
> --
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--
Jens B. Jorgensen
jjorgens@bdsinc.com