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?
