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); #ifdef CONFIG_IP_MASQUERADE /* 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; #endif if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/