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Date:      Fri, 28 Feb 2020 02:37:53 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 221445] The absence of the accept_rtadv option causes an error "ping6: sendmsg: No buffer space available"
Message-ID:  <bug-221445-7501-7JSRk8Lg3C@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-221445-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-221445-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D221445

--- Comment #5 from Vladislav V. Prodan <admin@support.od.ua> ---
A similar problem.

Hetzner data center.

The server is loaded into rescue mode with FreeBSD 12.0 x64.

[root@rescue ~]# uname -a
FreeBSD core.domain.com 12.0-RELEASE FreeBSD 12.0-RELEASE r341666 GENERIC=20
amd64

# I turn on ipv6
sysctl net.inet6.ip6.accept_rtadv=3D1
ifconfig igb0 inet6 2a01:4f8:241:XXXX::2/64
route -6 add default -iface igb0

# ping6 -c 4 ya.ru
PING6(56=3D40+8+8 bytes) 2a01:4f8:241:XXXX::2 --> 2a02:6b8::2:242
ping6: sendmsg: No buffer space available
ping6: wrote ya.ru 16 chars, ret=3D-1
ping6: sendmsg: No buffer space available
ping6: wrote ya.ru 16 chars, ret=3D-1
ping6: sendmsg: No buffer space available
ping6: wrote ya.ru 16 chars, ret=3D-1
ping6: sendmsg: No buffer space available
ping6: wrote ya.ru 16 chars, ret=3D-1

--- ya.ru ping6 statistics ---
4 packets transmitted, 0 packets received, 100.0% packet loss



[root@rescue ~]# ifconfig
igb0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
=20=20=20=20=20=20=20
options=3De507bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSU=
M,TSO4,TSO6,LRO,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 00:1e:67:b4:f9:e7
        inet 116.202.XXX.XXX netmask 0xffffffc0 broadcast 116.202.XXX.XXX
        inet6 2a01:4f8:241:XXXX::2 prefixlen 64
        inet6 fe80::21e:67ff:feb4:f9e7%igb0 prefixlen 64 scopeid 0x1
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
        nd6 options=3D21<PERFORMNUD,AUTO_LINKLOCAL>
lo0: flags=3D8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=3D680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2
        inet 127.0.0.1 netmask 0xff000000
        groups: lo
        nd6 options=3D21<PERFORMNUD,AUTO_LINKLOCAL>

[root@rescue ~]# netstat -rn6
Routing tables

Internet6:
Destination                       Gateway                       Flags     N=
etif
Expire
::/96                             ::1                           UGRS       =
 lo0
default                           00:1e:67:b4:f9:e7             US         =
igb0
::1                               link#2                        UH         =
 lo0
::ffff:0.0.0.0/96                 ::1                           UGRS       =
 lo0
2a01:4f8:241:XXXX::/64            link#1                        U          =
igb0
2a01:4f8:241:XXXX::2              link#1                        UHS        =
 lo0
fe80::/10                         ::1                           UGRS       =
 lo0
fe80::%igb0/64                    link#1                        U          =
igb0
fe80::21e:67ff:feb4:f9e7%igb0     link#1                        UHS        =
 lo0
fe80::%lo0/64                     link#2                        U          =
 lo0
fe80::1%lo0                       link#2                        UHS        =
 lo0
ff02::/16                         ::1                           UGRS       =
 lo0

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