Bug 221446 - add net default: gateway [IPv6 gateway] fib 0: route already in table
Summary: add net default: gateway [IPv6 gateway] fib 0: route already in table
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: bin (show other bugs)
Version: 11.1-STABLE
Hardware: Any Any
: --- Affects Only Me
Assignee: freebsd-net (Nobody)
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2017-08-12 15:33 UTC by Vladyslav V. Prodan
Modified: 2017-08-15 19:29 UTC (History)
1 user (show)

See Also:

Attachments
/boot/loader.conf (358 bytes, text/plain)
2017-08-12 15:33 UTC, Vladyslav V. Prodan 		no flags Details
/etc/sysctl.conf (861 bytes, text/plain)
2017-08-12 15:34 UTC, Vladyslav V. Prodan 		no flags Details
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Vladyslav V. Prodan 2017-08-12 15:33:32 UTC 
Created attachment 185322 [details]
/boot/loader.conf

In the continuation of Bug ID 221445.

After a little tuning in /boot/loader.conf and /etc/sysctl.conf I get in the logs:

...
Aug 12 18:00:50 tank1 kernel: em0: link state changed to UP
Aug 12 18:00:50 tank1 kernel: Starting Network: lo0 em0.
Aug 12 18:00:50 tank1 kernel: lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
Aug 12 18:00:50 tank1 kernel: options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
Aug 12 18:00:50 tank1 kernel: inet6 ::1 prefixlen 128
Aug 12 18:00:50 tank1 kernel: inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2
Aug 12 18:00:50 tank1 kernel: inet 127.0.0.1 netmask 0xff000000
Aug 12 18:00:50 tank1 kernel: nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
Aug 12 18:00:50 tank1 kernel: groups: lo
Aug 12 18:00:50 tank1 kernel: em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
Aug 12 18:00:50 tank1 kernel: options=4219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_MAGIC,VLAN_HWTSO>
Aug 12 18:00:50 tank1 kernel: ether 00:22:4d:ad:ff:dc
Aug 12 18:00:50 tank1 kernel: hwaddr 00:22:4d:ad:ff:dc
Aug 12 18:00:50 tank1 kernel: inet6 2001:41d0:e:340::1 prefixlen 128
Aug 12 18:00:50 tank1 kernel: inet6 fe80::222:4dff:fead:ffdc%em0 prefixlen 64 scopeid 0x1
Aug 12 18:00:50 tank1 kernel: nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
Aug 12 18:00:50 tank1 kernel: media: Ethernet autoselect (100baseTX <full-duplex>)
Aug 12 18:00:50 tank1 kernel: status: active
Aug 12 18:00:50 tank1 kernel: Starting devd.
Aug 12 18:00:50 tank1 kernel: Starting dhclient.
Aug 12 18:00:50 tank1 kernel: DHCPREQUEST on em0 to 255.255.255.255 port 67
Aug 12 18:00:50 tank1 kernel: DHCPACK from 5.196.XX.XXX
Aug 12 18:00:50 tank1 kernel: bound to 5.196.XX.XXX -- renewal in 300 seconds.
Aug 12 18:00:50 tank1 kernel: add host 127.0.0.1: gateway lo0 fib 0: route already in table
Aug 12 18:00:50 tank1 kernel: add host ::1: gateway lo0 fib 0: route already in table
Aug 12 18:00:50 tank1 kernel: add net fe80::: gateway ::1
Aug 12 18:00:50 tank1 kernel: add net ff02::: gateway ::1
Aug 12 18:00:50 tank1 kernel: add net ::ffff:0.0.0.0: gateway ::1
Aug 12 18:00:50 tank1 kernel: add net ::0.0.0.0: gateway ::1
Aug 12 18:00:50 tank1 kernel: add host 2001:41d0:000e:03ff:ff:ff:ff:ff: gateway em0
Aug 12 18:00:50 tank1 kernel: add net default: gateway 2001:41d0:000e:03ff:ff:ff:ff:ff fib 0: route already in table
Aug 12 18:00:50 tank1 kernel: ipfw2 (+ipv6) initialized, divert loadable, nat loadable, default to deny, logging disabled
...

# uname -a
FreeBSD tank1.storage.com 11.1-STABLE FreeBSD 11.1-STABLE #0 r322164: Mon Aug  7 15:33:19 UTC 2017     root@releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64

cat /etc/rc.conf:

...
ifconfig_em0="DHCP"

ipv6_default_interface="em0"
ifconfig_em0_ipv6="inet6 accept_rtadv 2001:41d0:e:XXX::1/128"

ipv6_static_routes="ipv6gw"
ipv6_route_ipv6gw="-host 2001:41d0:000e:03ff:ff:ff:ff:ff -iface em0"

ipv6_defaultrouter="2001:41d0:000e:03ff:ff:ff:ff:ff"
ipv6_activate_all_interfaces="YES"
...

# netstat -rn6
Routing tables

Internet6:
Destination                       Gateway                       Flags     Netif Expire
::/96                             ::1                           UGRS        lo0
default                           fe80::12bd:18ff:fee5:ff80%em0 UG          em0
::1                               link#2                        UH          lo0
::ffff:0.0.0.0/96                 ::1                           UGRS        lo0
2001:41d0:e:XXX::/56              link#1                        U           em0
2001:41d0:e:XXX::1                link#1                        UHS         lo0
2001:41d0:e:3ff:ff:ff:ff:ff       00:22:4d:ad:ff:dc             UHS         em0
fe80::/10                         ::1                           UGRS        lo0
fe80::%em0/64                     link#1                        U           em0
fe80::222:4dff:fead:ffdc%em0      link#1                        UHS         lo0
fe80::%lo0/64                     link#2                        U           lo0
fe80::1%lo0                       link#2                        UHS         lo0
ff02::/16                         ::1                           UGRS        lo0


I was helped by manual commands to restore Ipv6:
route delete -6 default
route add -6 default 2001:41d0:000e:03ff:ff:ff:ff:ff
Comment 1 Vladyslav V. Prodan 2017-08-12 15:34:57 UTC 
Created attachment 185324 [details]
/etc/sysctl.conf
Comment 2 Andrey V. Elsukov freebsd_committer freebsd_triage 2017-08-12 18:49:58 UTC 
Since you have enabled accepting RA, some router has sent RA, and SLAAC has occurred.
Comment 3 Vladyslav V. Prodan 2017-08-12 19:13:16 UTC 
(In reply to Andrey V. Elsukov from comment #2)

Then look Bug ID 221445.
Without the accept_rtadv option, ipv6 stops working.