IPv6 not working, radvd core dumping

bastian · Nov 14, 2017, 12:20 PM

Hi,

I was trying to setup IPv6 SLAAC on my Netgate SG-3100 (running 2.4.1-RELEASE). However, client devices were not receiving any IPv6 advertisements. After quite some time of debugging I found out that the Router Advertisement Daemon (radvd) was not coming up. Trying to start it manually using the Status > Services page resulted in the following error messages in system.log:


Nov 14 12:55:58 sense kernel: pid 53306 (radvd), uid 0: exited on signal 10 (core dumped)
Nov 14 12:55:59 sense UNKNOWN[54359]: Process 53306 died: No such process; trying to remove PID file. (/var/run/radvd.pid)
Nov 14 12:56:00 sense kernel: pid 54359 (radvd), uid 0: exited on signal 10 (core dumped)
Nov 14 12:56:36 sense UNKNOWN[60366]: Process 54359 died: No such process; trying to remove PID file. (/var/run/radvd.pid)
Nov 14 12:56:37 sense kernel: pid 60366 (radvd), uid 0: exited on signal 10 (core dumped)
Nov 14 12:56:59 sense UNKNOWN[92490]: Process 60366 died: No such process; trying to remove PID file. (/var/run/radvd.pid)

As the following output suggests, however, the syntax of the configuration file /var/etc/radvd.conf seems to be OK:


/usr/local/sbin/radvd -c -C /var/etc/radvd.conf
Syntax OK

Starting radvd from the console with debugging enabled results in the following output:


/usr/local/sbin/radvd -d 5 -p /var/run/radvd.pid -C /var/etc/radvd.conf -m stderr
[Nov 14 13:15:01] radvd: version 1.9.1 started
[Nov 14 13:15:01] radvd: mtu for mvneta1 is 1500
[Nov 14 13:15:01] radvd: link layer token length for mvneta1 is 48
[Nov 14 13:15:01] radvd: prefix length for mvneta1 is 64
[Nov 14 13:15:01] radvd: interface definition for mvneta1 is ok
[Nov 14 13:15:01] radvd: mvneta1: if_index 2
[Nov 14 13:15:01] radvd: setting LinkMTU (1500) for mvneta1 is not supported
[Nov 14 13:15:01] radvd: setting CurHopLimit (64) for mvneta1 is not supported
[Nov 14 13:15:01] radvd: sending RA on mvneta1
[Nov 14 13:15:01] radvd: adding prefix 2003:x:xxxx:xxxx:: to advert for mvneta1
Bus error (core dumped)

It seems that the radvd implementation is flawed. Please find the automatically generated configuration below:


cat /var/etc/radvd.conf
# Automatically Generated, do not edit
# Generated for DHCPv6 Server lan
interface mvneta1 {
	AdvSendAdvert on;
	MinRtrAdvInterval 5;
	MaxRtrAdvInterval 20;
	AdvLinkMTU 1500;
	AdvDefaultPreference medium;
	prefix 2003:x:xxxx:xxxx::/64 {
		DeprecatePrefix on;
		AdvOnLink on;
		AdvAutonomous on;
		AdvRouterAddr on;
		AdvValidLifetime 86400;
		AdvPreferredLifetime 14400;
	};
	route ::/0 {
		RemoveRoute on;
	};
	RDNSS 2003:a:xxxx:xxx:xxx:xxxx:xxxx:xxxx { };
	DNSSL localdomain  { };
};

Any recommendations?

bmeeks · Nov 14, 2017, 12:35 PM

This is a known issue with radvd. The bug is fixed in the next release of pfSense (2.4.2). It only happens on ARM hardware like the SG-3100. Here is the bug report and documentation of the upcoming fix from the pfSense Redmine bug site: https://redmine.pfsense.org/issues/8022#change-35066.

Bill