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    SubjectRe: ISSUE: Linux bug/restriction prevents multicast participation
    On Thu, Sep 14, 2000 at 12:40:01AM -0700, Matthew Delco wrote:
    > Bug report form (as suggested by the old mailing list FAQ)
    > ----------------------------------------------------------
    > Summary: A bug/misguided restriction in Linux prevents users from
    > participating in certain multicast video sessions.
    > Full description: Multicast standards prescribe that the port range
    > 49152-65535 be used for video traffic. From my observations, Linux does not

    Sounds like a bug in the protocols. Why this restriction?

    > Other notes, patches, fixes, workarounds: No external solution is available,
    > since sessions are announced using automated tools (SDR) on various OSes,
    > and it's unreasonable to force users to recompile and run a hacked kernel to
    > use multicast or run programs such as vic/vat as setuid root (assuming
    > there's a way for root to get around this restriction, which I'm not sure is
    > possible).

    The workaround is to not enable CONFIG_IP_MASQUERADE in the kernel
    configuration. 2.4 also does not have the problem. Here is a patch against
    2.2.17. I'll submit it for 2.2.18.

    --- linux-work/net/ipv4/af_inet.c-MC Sun Jul 30 02:04:11 2000
    +++ linux-work/net/ipv4/af_inet.c Thu Sep 14 11:51:39 2000
    @@ -538,7 +538,8 @@
    snum = ntohs(addr->sin_port);
    /* The kernel masquerader needs some ports. */
    - if((snum >= PORT_MASQ_BEGIN) && (snum <= PORT_MASQ_END))
    + if((snum >= PORT_MASQ_BEGIN) && (snum <= PORT_MASQ_END) &&
    + chk_addr_ret != RTN_MULTICAST)
    return -EADDRINUSE;
    if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))

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