Re: IPv6 networking stops on FreeBSD some time after boot
- In reply to: Farooq Karimi Zadeh : "Re: IPv6 networking stops on FreeBSD some time after boot"
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Date: Thu, 24 Sep 2026 07:15:16 UTC
On 9/23/26 23:27, Farooq Karimi Zadeh wrote: > On 9/23/26 22:34, Dmitry Salychev wrote: >> Farooq Karimi Zadeh<hapu@riseup.net> writes: >> >>> 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. >> 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 >> > > > This is "netstat -rn6" when it doesn't work: > > > > 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 > > > I posted IPv6 configuration in /etc/rc.conf, however, here is all of it: > > > clear_tmp_enable="YES" > hostname="XXX" > ifconfig_vtnet0="inet XXX.XXX.XXX.XXX netmask 255.255.255.128" > ifconfig_vtnet0_ipv6="inet6 XXXX:XXX:X:XXX::1/64" > defaultrouter="XXX.XXX.XXX.XXX" > ipv6_defaultrouter="fe80::1%vtnet0" > sshd_enable="YES" > moused_nondefault_enable="NO" > # Set dumpdev to "AUTO" to enable crash dumps, "NO" to disable > dumpdev="NO" > nginx_enable="YES" > grafana_enable="NO" > wstunnel_enable="NO" > headscale_enable="YES" > tailscaled_enable="YES" > transmission_enable="YES" > pf_enable="no" > pflog_enable="no" > pflog_logfile="/var/log/pflog" > pflog_flags="" > pf_flags="" > pf_rules="/etc/pf.conf" > gateway_enable="no" > tor_enable="YES" > dnstt_enable="YES" > socks_proxy_enable="YES" > snowflake_enable="YES" > > > Output of "drill -4 example.com": > > > ;; ->>HEADER<<- opcode: QUERY, rcode: NOERROR, id: 52119 > ;; flags: qr rd ra ; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 > ;; QUESTION SECTION: > ;; example.com. IN A > > ;; ANSWER SECTION: > example.com. 300 IN A 104.20.23.154 > example.com. 300 IN A 172.66.147.243 > > ;; AUTHORITY SECTION: > > ;; ADDITIONAL SECTION: > > ;; Query time: 15 msec > ;; SERVER: 8.8.8.8 > ;; WHEN: Wed Sep 23 23:22:08 2026 > ;; MSG SIZE rcvd: 61 > > > Output of "drill -6 example.com": > > > Error: error sending query: No (valid) nameservers defined in the resolver > > > "drill example.com AAAA" gives 2606:4700:10::ac42:93f3 and then pinging > it doesn't work and al packets are lost. > > > Output of "ndp -a": > > > Neighbor Linklayer Address Netif Expire > S Flags > fe80::1%vtnet0 xx:xx:xx:xx:xx:xx vtnet0 34s R R > XXXX:XXX:X:XXX::1 xx:xx:xx:xx:xx:xx vtnet0 permanent R > fe80::be24:11ff:febd:184b%vtnet0 xx:xx:xx:xx:xx:xx vtnet0 permanent R > > > Will send output of ndisc6 tomorrow, God willing. > I really apologize for sending HTML emails. I really thought I had configured Thunderbird to NOT send HTML emails.