Recent changes in routing or IPv6 related parts?

From: Alexander Leidinger <Alexander_at_leidinger.net>
Date: Tue, 22 May 2018 10:12:22 +0200
Hi,

I've updated 2 machines to r333966 and I see a change in the behavior  
in the network area on one of the systems.

To begin with, the "original" behavior was not OK either, the em NIC  
fails to "do proper network communication"  
(https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220997). A  
workaround for me was so far to do an IPv4 ping to the router from  
time to time, and if it fails do some ifconfig down/up. If the ping  
doesn't work afterwards, reboot. Most of the time this worked.

Now I see a change in behavior, the scripts kicks in, all is ok for  
the script afterwards, but internally (inside the machine) I can't  
reach ipv6 jails. The system is reachable externally (only tested so  
far is the main host-IP).

The setup is vimage based, several jails (via iocage) on epairs  
connected via bridge to the NIC. One bridge for IPv6, one for IPv4.  
rc.conf has prefer IPv4 setting after encountering another issue.

One IPv4 address (/32) for the host where a nginx is running to proxy  
port 80 and 443 requests on IPv4 to the IPv6 addresses of the jails  
(IPv6 access is going directly to the jails).

After a reboot, the nginx on the main IPv4 address delivers data from  
the ipv6 addresses of the jails (rev-proxy setup). After a while this  
stops working. The workaround-script mentioned above doesn't change  
this behavior. Restarting nginx doesn't help. A reboot helps.

Has someone an idea of recent changes in a related area which may be  
able to cause such an issue? Any rev I could try to revert to check if  
it is related?

Bye,
Alexander.

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Received on Tue May 22 2018 - 09:52:10 UTC

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