US Cable Support > Comcast HSI > Odd log message

 
When I set net.inet6.ip6.accept_rtadv=1 in /etc/sysctl.conf, I see the following entry in the routing table:

Destination                        Gateway                        Flags   Refs      Use   Mtu  Prio Iface Label
fe80::1edf:fff:fe02:28e2%em0       1c:df:0f:02:28:e2              UHLc       0        0     -     4 em0  


So the rtavd message is inserting a route into the routing table here. Which, btw, is not surprising. This is the way things should work.

My opinion on the log flooding is that the OS is logging things that it should not be logging.

From the source code of rtadvd on OpenBSD:


        /*
         * RA consistency check according to RFC-2461 6.2.7
         */
        if ((rai = if_indextorainfo(pi->ipi6_ifindex)) == 0) {
                log_info("received RA from %s on non-advertising interface(%s)",
                    inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
                        INET6_ADDRSTRLEN),
                    if_indextoname(pi->ipi6_ifindex, ifnamebuf));
                goto done;
        }



If you look at the RFC specified (RFC-2461, ¶ 6.2.7), it appears to me that it is talking about the contents of RA packets, not whether or not those packets appear on an interface. So, imo, the logging of the packets is overly aggressive.

As I mentioned in an earlier message, that piece of code goes back to the original KAME project. The code may have never been touched because, until recently, there not has been a major ISP that is providing dual-stack IPv6 capability.