I'd like to advocate implementing http://www.freebsd.org/cgi/query-pr.cgi?pr=180893
Quoting the PR: Some errant network equipment (including the simulation of a network by VMware, as an example) will reflect back multicast packets to the sender. This breaks protocols such as DAD and makes IPv6 nearly impossible to use on these networks. Now, the argument could be made to fix these network elements, but there is an elegant solution that improves the quality of FreeBSD: To refuse packets that have a source ethernet address of the receiving interface. If you consider this notion, you can quickly and easily accept that an interface should never "receive" a packet from it's own MAC address. This behaviour mirrors Linux behavior and I assume Windows behavior. I won't claim to be experienced in kernel matters, but I chose the location for this modification to allow BPF to "see" the packets (for network diagnosis). This test, however, could be moved within this function or even given a sysctl knob. _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
