I found some other reports of the same problem with rtadvd logging excessive messages about router advertisements on the external non-advertising interface.
>From OpenBSD 5.2: http://openbsd.7691.n7.nabble.com/Excessive-logging-by-rtadvd-td225936.html >From m0n0wall (aka FreeBSD), also seeing a log message every 3 seconds with Comcast: http://www.dslreports.com/forum/r28132613-Odd-log-message I updated my rtadvd.c so it calls log_debug instead of log_info. This silences the logs for me and still works fine. Any chance this could get applied? Thanks. Index: usr.sbin/rtadvd/rtadvd.c =================================================================== RCS file: /cvs/src/usr.sbin/rtadvd/rtadvd.c,v retrieving revision 1.47 diff -u -p -r1.47 rtadvd.c --- usr.sbin/rtadvd/rtadvd.c 4 Jul 2014 22:39:31 -0000 1.47 +++ usr.sbin/rtadvd/rtadvd.c 1 Jan 2015 17:49:02 -0000 @@ -823,7 +823,7 @@ ra_input(int len, struct nd_router_adver * 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)", + log_debug("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)); On Wed, Dec 31, 2014 at 1:18 PM, Aaron Riekenberg < [email protected]> wrote: > Thanks - I've read that and it was very helpful in getting things set up. > > My questions is just why rtadvd is logging a message to syslog every time > a router advertisement is received on the external interface. > > On Wed, Dec 31, 2014 at 1:15 PM, Joshua Smith <[email protected]> wrote: > >> >> http://marc.info/?l=openbsd-misc&m=141703607321548&w=2 >> -- >> Josh Smith >> KD8HRX >> >> Email/jabber: [email protected] >> >> Sent from my iPhone. >> >> > On Dec 31, 2014, at 2:01 PM, Aaron Riekenberg < >> [email protected]> wrote: >> > >> > I have an OpenBSD 5.6 box that I'm using as a router and firewall for my >> > local LAN, using both ipv4 and ipv6. Things are mostly working, but I'm >> > seeing some possibly broken/annoying behavior from rtadvd. First some >> > background information: >> > >> > My box has 2 ethernet interfaces: em0 is the external connection, and >> em1 >> > is the local LAN. Comcast provides ipv6 router advertisements and uses >> > dhcpv6 to provide a /128 address (used by em0) and a /64 prefix >> delegation >> > used by my local LAN. I'm using wide-dhcpv6 to assign addresses to my >> em0 >> > and em1 and this all works fine. >> > >> > I have the issue that if net.inet6.ip6.forwarding=1, the kernel is not >> able >> > to automatically configure the default ipv6 route based on router >> > advertisements, even with the new "inet6 autoconf" parameter ( >> > http://permalink.gmane.org/gmane.os.openbsd.misc/217825). >> > >> > To work around this, I temporarily ran rtsold, figured out the ipv6 >> address >> > of Comcast's router, and added it to /etc/mygate. This works fine, and >> I >> > am no longer running rtsold. >> > >> > Now I run "rtadvd em1" to send router advertisements to the local LAN. >> I >> > have no /etc/rtadvd.conf file, so I am using the default configuration. >> > This again works fine, and hosts on my local LAN automatically get an >> ipv6 >> > address and route (yay!). >> > >> > But all is not quite perfect. If I look at /var/log/daemon, I see lots >> and >> > lots of messages from rtadvd like this: >> > >> > Dec 31 12:44:21 server rtadvd[28960]: received RA from >> > fe80::224:14ff:fe63:cae2 on non-advertising interface(em0) >> > Dec 31 12:44:54 server last message repeated 11 times >> > Dec 31 12:46:56 server last message repeated 40 times >> > Dec 31 12:51:32 server last message repeated 90 times >> > >> > This is saying rtadvd received a router advertisement from Comcast's >> router >> > (fe80::224:14ff:fe63:cae2). Comcast's router apparently sends on of >> these >> > every 3 seconds - this is the rate at which syslog is filling with these >> > messages. >> > >> > I can disable logging for rtadvd in syslog.conf, but this is annoying. >> > There are potentially many others like me with Comcast or other ipv6 >> > connections that want to run rtadvd on the internal interface and will >> > receive router advertisements on the external interface. >> > Thoughts/questions: >> > >> > * Why is rtadvd logging router advertisements on em0 when I am >> specifying >> > em1 as the only interface it should be using? Wouldn't it be better to >> > just silently ignore router advertisements from non-configured >> interfaces? >> > * What will happen when/if we can have net.inet6.ip6.forwarding=1 and >> > "inet6 autoconf" for my external interface? Will rtadvd still receive >> > router advertisements for the external interface and complain about >> them?
