Re: IPv6 networking stops on FreeBSD some time after boot
- Reply: Farooq Karimi Zadeh : "Re: IPv6 networking stops on FreeBSD some time after boot"
- Reply: Farooq Karimi Zadeh : "Re: IPv6 networking stops on FreeBSD some time after boot"
- In reply to: Dmitry Salychev : "Re: IPv6 networking stops on FreeBSD some time after boot"
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Date: Wed, 23 Sep 2026 19:57:48 UTC
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<div class="moz-cite-prefix">On 9/23/26 22:34, Dmitry Salychev
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:86mrt73i20.fsf@paladin.salychev.org">
<pre wrap="" class="moz-quote-pre">Farooq Karimi Zadeh <a class="moz-txt-link-rfc2396E" href="mailto:hapu@riseup.net"><hapu@riseup.net></a> writes:
</pre>
<blockquote type="cite">
<pre wrap="" class="moz-quote-pre">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).
The IPv6 gateway from the provider is fe80::1. This is "netstat -rn6":
Routing tables
Internet6:
Destination Gateway Flags Netif Expire
::/96 link#2 URS lo0
default fe80::1%vtnet0 UGS vtnet0
::1 link#2 UHS lo0
::ffff:0.0.0.0/96 link#2 URS lo0
XXXX:XXX:X:XXX::/64 link#1 U vtnet0
XXXX:XXX:X:XXX::1 link#2 UHS lo0
fe80::%lo0/10 link#2 URS lo0
fe80::%vtnet0/64 link#1 U vtnet0
fe80::be24:11ff:febd:184b%lo0 link#2 UHS lo0
fe80::%lo0/64 link#2 U lo0
fe80::1%lo0 link#2 UHS lo0
ff02::/16 link#2 URS lo0
This is "ifconfig vtnet0":
vtnet0: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500
options=ec07bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6,HWSTATS>
ether bc:24:11:bd:18:4b
inet xxx.xxx.xxx.xxx netmask 0xffffff80 broadcast xxx.xxx.xxx.xxx
inet6 fe80::be24:11ff:febd:184b%vtnet0 prefixlen 64 scopeid 0x1
inet6 XXXX:XXX:X:XXX::1 prefixlen 64
media: Ethernet autoselect (10Gbase-T <full-duplex>)
status: active
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
And "cat /etc/rc.conf | grep ipv6":
ifconfig_vtnet0_ipv6="inet6 XXXX:XXX:X:XXX::1/64"
ipv6_defaultrouter="fe80::1%vtnet0"
"ping6 example.com" works for few minutes after a boot.
Any hint appreciated. And let me know if more information is needed.
BR,
Farooq.
</pre>
</blockquote>
<pre wrap="" class="moz-quote-pre">
Could you show /etc/rc.conf (don't forget to strip off all the sensitive
info)? Do you still have the default IPv6 route when you cannot ping
anything? Can you do both `drill -4 example.com` and `drill -6
example.com`?
Regards,
Dmitry
</pre>
</blockquote>
<p><br>
</p>
<p><br>
</p>
<p><font face="Vazir">This is "netstat -rn6" when it doesn't work:</font></p>
<p><font face="Vazir"><br>
</font></p>
<p><font face="Vazir"><br>
Internet6:<br>
Destination Gateway
Flags Netif Expire<br>
::/96 link#2
URS lo0<br>
default fe80::1%vtnet0
UGS vtnet0<br>
::1 link#2
UHS lo0<br>
::ffff:0.0.0.0/96 link#2
URS lo0<br>
XXXX:XXX:X:XXX::/64 link#1
U vtnet0<br>
XXXX:XXX:X:XXX::1 link#2
UHS lo0<br>
fe80::%lo0/10 link#2
URS lo0<br>
fe80::%vtnet0/64 link#1
U vtnet0<br>
fe80::be24:11ff:febd:184b%lo0 link#2
UHS lo0<br>
fe80::%lo0/64 link#2
U lo0<br>
fe80::1%lo0 link#2
UHS lo0<br>
ff02::/16 link#2
URS lo0</font></p>
<p><font face="Vazir"><br>
</font></p>
<p><font face="Vazir">I posted IPv6 configuration in /etc/rc.conf,
however, here is all of it:</font></p>
<p><font face="Vazir"><br>
</font></p>
<p><font face="Vazir">clear_tmp_enable="YES"<br>
hostname="XXX"<br>
ifconfig_vtnet0="inet </font><font face="Vazir">XXX.XXX.XXX.XXX</font><font
face="Vazir"> netmask 255.255.255.128"<br>
ifconfig_vtnet0_ipv6="inet6 XXXX:XXX:X:XXX::1/64"<br>
defaultrouter="XXX.XXX.XXX.XXX"<br>
ipv6_defaultrouter="fe80::1%vtnet0"<br>
sshd_enable="YES"<br>
moused_nondefault_enable="NO"<br>
# Set dumpdev to "AUTO" to enable crash dumps, "NO" to disable<br>
dumpdev="NO"<br>
nginx_enable="YES"<br>
grafana_enable="NO"<br>
wstunnel_enable="NO"<br>
headscale_enable="YES"<br>
tailscaled_enable="YES"<br>
transmission_enable="YES"<br>
pf_enable="no"<br>
pflog_enable="no"<br>
pflog_logfile="/var/log/pflog"<br>
pflog_flags=""<br>
pf_flags=""<br>
pf_rules="/etc/pf.conf"<br>
gateway_enable="no"<br>
tor_enable="YES"<br>
dnstt_enable="YES"<br>
socks_proxy_enable="YES"<br>
snowflake_enable="YES"</font></p>
<p><font face="Vazir"><br>
</font></p>
<p><font face="Vazir">Output of "drill -4 example.com":</font></p>
<p><font face="Vazir"><br>
</font></p>
<p><font face="Vazir">;; ->>HEADER<<- opcode: QUERY,
rcode: NOERROR, id: 52119<br>
;; flags: qr rd ra ; QUERY: 1, ANSWER: 2, AUTHORITY: 0,
ADDITIONAL: 0 <br>
;; QUESTION SECTION:<br>
;; example.com. IN A<br>
<br>
;; ANSWER SECTION:<br>
example.com. 300 IN A 104.20.23.154<br>
example.com. 300 IN A 172.66.147.243<br>
<br>
;; AUTHORITY SECTION:<br>
<br>
;; ADDITIONAL SECTION:<br>
<br>
;; Query time: 15 msec<br>
;; SERVER: 8.8.8.8<br>
;; WHEN: Wed Sep 23 23:22:08 2026<br>
;; MSG SIZE rcvd: 61</font></p>
<p><font face="Vazir"><br>
</font></p>
<p><font face="Vazir">Output of "drill -6 example.com":</font></p>
<p><font face="Vazir"><br>
</font></p>
<p><font face="Vazir">Error: error sending query: No (valid)
nameservers defined in the resolver</font></p>
<p><font face="Vazir"><br>
</font></p>
<p><font face="Vazir">"drill example.com AAAA" gives
2606:4700:10::ac42:93f3 and then pinging it doesn't work and al
packets are lost.</font></p>
<p><font face="Vazir"><br>
</font></p>
<p><font face="Vazir">Output of "ndp -a":</font></p>
<p><font face="Vazir"><br>
</font></p>
<p><font face="Vazir">Neighbor Linklayer
Address Netif Expire S Flags<br>
fe80::1%vtnet0 xx:xx:xx:xx:xx:xx vtnet0
34s R R<br>
XXXX:XXX:X:XXX::1 xx:xx:xx:xx:xx:xx vtnet0
permanent R <br>
fe80::be24:11ff:febd:184b%vtnet0 xx:xx:xx:xx:xx:xx vtnet0
permanent R </font></p>
<p><font face="Vazir"><br>
</font></p>
<p><font face="Vazir">Will send output of ndisc6 tomorrow, God
willing.</font></p>
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