13 Dec
2016
13 Dec
'16
8:50 p.m.
So, I've had IPv6 configured how I believe it should be for some time,
but every time I test it (which is limited by the lack of IPv6
connectivity by my backward ISP), it doesn't seem to be working, in or
out. Can anyone help me getting it working?
I've replaced my IP allocation with 'beef' below.
I've flushed my ip6table rules for now
/etc/network/interfaces:
<snip>
iface eth0 inet6 static
address 2001:ba8:1f1:beef::2
netmask 64
gateway 2001:ba8:1f1:beef::1
post-up sysctl -w net.ipv6.conf.default.accept_ra=0
post-up sysctl -w net.ipv6.conf.all.accept_ra=0
post-up sysctl -w net.ipv6.conf.${IFACE}.accept_ra=0
post-up sysctl -w net.ipv6.conf.default.autoconf=0
post-up sysctl -w net.ipv6.conf.all.autoconf=0
post-up sysctl -w net.ipv6.conf.${IFACE}.autoconf=0
# ip -6 addr show dev eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
inet6 2001:ba8:1f1:beef::2/64 scope global deprecated
valid_lft forever preferred_lft 0sec
inet6 2001:ba8:1f1:beef:216:5eff:fe00:2c0/64 scope global deprecated
mngtmpaddr dynamic
valid_lft 22130sec preferred_lft 0sec
inet6 fe80::216:5eff:beef:2c0/64 scope link
valid_lft forever preferred_lft forever
eth0 Link encap:Ethernet HWaddr 00:16:5e:00:02:XX
inet addr:85.119.X.Y Bcast:85.119.A.B Mask:255.255.248.0
inet6 addr: fe80::216:5eff:fe00:2c0/64 Scope:Link
inet6 addr: 2001:ba8:1f1:beef:216:5eff:fe00:2c0/64 Scope:Global
inet6 addr: 2001:ba8:1f1:beef::2/64 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:622300 errors:0 dropped:0 overruns:0 frame:0
TX packets:598288 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:X (X.X MiB) TX bytes:X (X.X MiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:54214 errors:0 dropped:0 overruns:0 frame:0
TX packets:54214 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:X (X.X MiB) TX bytes:X (X.X MiB)
# ip -6 route
2001:ba8:1f1:beef::/64 dev eth0 proto kernel metric 256
fe80::/64 dev eth0 proto kernel metric 256
# traceroute6 ipv6.google.com
traceroute to ipv6.google.com (2a00:1450:4009:807::200e), 30 hops max,
80 byte packets
connect: Network is unreachable
13 Dec
13 Dec
8:55 p.m.
On Tue, Dec 13, 2016 at 08:50:00PM +0000, Gavin Westwood wrote:
So, I've had IPv6 configured how I believe it
should be for some time,
but every time I test it (which is limited by the lack of IPv6
connectivity by my backward ISP), it doesn't seem to be working, in or
out. Can anyone help me getting it working?
I've replaced my IP allocation with 'beef' below.
I've flushed my ip6table rules for now
/etc/network/interfaces:
<snip>
iface eth0 inet6 static
address 2001:ba8:1f1:beef::2
netmask 64
gateway 2001:ba8:1f1:beef::1
post-up sysctl -w net.ipv6.conf.default.accept_ra=0
post-up sysctl -w net.ipv6.conf.all.accept_ra=0
post-up sysctl -w net.ipv6.conf.${IFACE}.accept_ra=0
post-up sysctl -w net.ipv6.conf.default.autoconf=0
post-up sysctl -w net.ipv6.conf.all.autoconf=0
post-up sysctl -w net.ipv6.conf.${IFACE}.autoconf=0
# ip -6 addr show dev eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
inet6 2001:ba8:1f1:beef::2/64 scope global deprecated
valid_lft forever preferred_lft 0sec
inet6 2001:ba8:1f1:beef:216:5eff:fe00:2c0/64 scope global deprecated
mngtmpaddr dynamic
valid_lft 22130sec preferred_lft 0sec
inet6 fe80::216:5eff:beef:2c0/64 scope link
valid_lft forever preferred_lft forever
eth0 Link encap:Ethernet HWaddr 00:16:5e:00:02:XX
inet addr:85.119.X.Y Bcast:85.119.A.B Mask:255.255.248.0
inet6 addr: fe80::216:5eff:fe00:2c0/64 Scope:Link
inet6 addr: 2001:ba8:1f1:beef:216:5eff:fe00:2c0/64 Scope:Global
inet6 addr: 2001:ba8:1f1:beef::2/64 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:622300 errors:0 dropped:0 overruns:0 frame:0
TX packets:598288 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:X (X.X MiB) TX bytes:X (X.X MiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:54214 errors:0 dropped:0 overruns:0 frame:0
TX packets:54214 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:X (X.X MiB) TX bytes:X (X.X MiB)
# ip -6 route
2001:ba8:1f1:beef::/64 dev eth0 proto kernel metric 256
fe80::/64 dev eth0 proto kernel metric 256
You don't have a default route. You're routing to your local
network, and to the link-local address only. My (fully working, and
slightly more complex) IPv6 routing table is:
2001:8b0:11fe:8d1d:2::/80 dev dmz proto kernel metric 256 pref medium
2001:8b0:11fe:8d1d::/64 dev br0 proto kernel metric 256 pref medium
fe80::/64 dev br0 proto kernel metric 256 pref medium
fe80::/64 dev dmz proto kernel metric 256 pref medium
fe80::/64 dev enp2s0 proto kernel metric 256 pref medium
default via 2001:8b0:11fe:8d1d::252 dev br0 metric 1024 pref medium
So somehow your gateway is going missing.
Hugo.
# traceroute6 ipv6.google.com
traceroute to ipv6.google.com (2a00:1450:4009:807::200e), 30 hops max,
80 byte packets
connect: Network is unreachable
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8:56 p.m.
On 13/12/16 20:50, Gavin Westwood wrote:
[snip]
# ip -6 route
2001:ba8:1f1:beef::/64 dev eth0 proto kernel metric 256
fe80::/64 dev eth0 proto kernel metric 256
I'm no IPv6 expert, but the obvious thing which you seem to be missing
there is a default route. My corresponding output is:
2001:ba8:1f1:beef::/64 dev eth0 proto kernel metric 256
fe80::/64 dev eth0 proto kernel metric 256
default via 2001:ba8:1f1:beef::1 dev eth0 metric 1024
OTOH, I can't see from the configuration which you've posted *why* you
don't have said default route.
I did nothing to configure IPv6 on my VPS. I just assumed it would be
there, and it was.
Cheers,
John
9:33 p.m.
On 13/12/2016 20:56, John Winters wrote:
<snip>
OTOH, I can't see from the configuration which you've posted *why* you
don't have said default route.
I did nothing to configure IPv6 on my VPS. I just assumed it would be
there, and it was.
Ah, thanks John, Hugo.
I wonder if it is related to this that I just found:
"I suspect you have a copy of the DHCP client running somewhere. I've
seen intermittent issues like this when dhclient wakes up near the end
of the lease expiration time. Make sure this is fully disabled (you can
probably go so far as chmod -x or even removing it, as it has no real
purpose on production servers). Check ps aux and make sure you don't see
anything relating to DHCP."
(http://serverfault.com/questions/365445/debian-server-loses-default-gateway…)
# aptitude search ~i | grep dhcp
i A isc-dhcp-client - DHCP client for automatically
obtaining an
i A isc-dhcp-common - common files used by all of the
isc-dhcp p
This was from when I tried to set my server up for VPN and was
unsuccessful (perhaps also due to routing issues). I'll uninstall them.
Gavin
9:53 p.m.
On 13/12/2016 21:33, Gavin Westwood wrote:
Ah, thanks John, Hugo.
<snip>
# aptitude search ~i | grep dhcp
i A isc-dhcp-client - DHCP client for automatically
obtaining an
i A isc-dhcp-common - common files used by all of the
isc-dhcp p
This was from when I tried to set my server up for VPN and was
unsuccessful (perhaps also due to routing issues). I'll uninstall them.
I did that and manually added a gateway, which seems to have done the trick:
# traceroute6 ipv6.google.com
traceroute to ipv6.google.com (2a00:1450:4009:807::200e), 30 hops max,
80 byte packets
1 2001:ba8:1f1:beef::1 (2001:ba8:1f1:beef::1) 0.262 ms 0.284 ms
0.313 ms
2 jump-gw-1.ipv6.bitfolk.com (2001:ba8:0:1f1::1) 0.758 ms 0.874 ms
0.933 ms
3 2001:ba8:0:17::f (2001:ba8:0:17::f) 0.426 ms 0.621 ms 0.608 ms
4 2001:4860:0:1::1893 (2001:4860:0:1::1893) 1.598 ms * *
5 2001:4860:0:1::1dad (2001:4860:0:1::1dad) 1.331 ms 1.413 ms 1.402 ms
6 * lhr35s06-in-x0e.1e100.net (2a00:1450:4009:807::200e) 1.030 ms
1.104 ms
Thank you both. :-)
Gavin
2699
days inactive
2699
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4 comments
3 participants
participants (3)
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Gavin Westwood -
Hugo Mills -
John Winters