Re: IPv6 networking stops on FreeBSD some time after boot

From: Mark Felder <feld_at_freebsd.org>
Date: Fri, 25 Sep 2026 19:59:13 UTC
On 9/23/26 9:53 AM, Farooq Karimi Zadeh wrote:
>
> Hello
>
>
> I've got a VPS running 15.1-RELEASE-p1 which has got a network 
> interface "vtnet0" and the provider supports both IPv4 and IPv6. IPv4 
> works fine on the machine all the time. However, IPv6 stops
>
> working some time after boot(10-20 minutes).
>
>

I'm also experiencing the same thing with my VPS on Vultr. The default 
gateway just disappears. My pf config:

tcp_ports="{ REDACTED }"
udp_ports="{ REDACTED }"
icmp_types="{ 0, 3, 8, 11 }"
icmp6_types = "{ 1, 2, 3, 4, 128, 129, 135, 136 }"
ext_if="vtnet0"

block return log all

set skip on lo0

pass in quick inet proto icmp icmp-type $icmp_types
pass in quick inet6 proto icmp6 icmp6-type $icmp6_types

pass in quick proto tcp from any to any port $tcp_ports flags S/SA keep 
state
pass in quick proto udp from any to any port $udp_ports

pass out proto tcp from any to any keep state
pass out proto {udp, icmp, icmp6} from any to any




Mark