Unix & Linux Asked by chmike on February 13, 2021
I had a Debian Jessie server instance hosted by a provider. This instance had its IPv6 an IPv4 address defined statically. I upgraded my server to Debian Buster, and its IPv4 address is defined by DHCP. But the IPv6 address is not automatically set.
This is what I get with ifconfig:
eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 151.80.**.** netmask 255.255.255.0 broadcast 151.80.**.**
inet6 fe80::eea8:6bff:****:**** prefixlen 64 scopeid 0x20<link>
ether ec:a8:6b:f1:**:** txqueuelen 1000 (Ethernet)
RX packets 925 bytes 78623 (76.7 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 380 bytes 55091 (53.7 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 20 memory 0xf7c00000-f7c20000
The IPv6 address of my server is 2001:41d0:e:::****. This is what I defined in my DNS as AAAA address. It was working perfectly with Jessie and a static configuration.
Why is the IPv6 address not set automatically by DHCP ? Is it because they don’t provide it with DHCP information ? Or is it because Debian ignores it and doesn’t set it ?
I can’t configure the IPv6 address because I’m lacking the gateway address.
Solved the problem.
I tried to apply the procedure provided by my hosting provider here: https://docs.ovh.com/fr/dedicated/network-ipv6/. Unfortunately it didn’t work.
The reason is that the network is named eno1 and not eth0 when I execute ifconfig
.
Here is what I did.
In /etc/sysctl.conf I added the following at the end of the file:
net.ipv6.conf.all.autoconf = 0
net.ipv6.conf.default.autoconf = 0
net.ipv6.conf.eno1.autoconf = 0
net.ipv6.conf.all.accept_ra = 0
net.ipv6.conf.default.accept_ra = 0
net.ipv6.conf.eno1.accept_ra = 0
In /etc/network/interfaces I added the following just after iface eth0 inet dhcp
.
iface eno1 inet6 static
address 2001:41d0:****:****:****:****
netmask 128
post-up /sbin/ip -family inet6 route add 2001:41d0:****:**ff:ff:ff:ff:ff dev eno1
post-up /sbin/ip -family inet6 route add default via 2001:41d0:****:**ff:ff:ff:ff:ff
pre-down /sbin/ip -family inet6 route del default via 2001:41d0:****:**ff:ff:ff:ff:ff
pre-down /sbin/ip -family inet6 route del 2001:41d0:****:**ff:ff:ff:ff:ff dev eno1
I then restart the network with the command /etc/init.d/networking restart
.
I then see the static IPv6 address shown in the output of ifconfig
as expected.
Correct answer by chmike on February 13, 2021
I encountered the same problem. Your post helped me, thanks. here is my procedure.
verification
ifconfig
nano /etc/sysctl.conf
nano /etc/network/interfaces
nano /etc/network/interfaces.d/50-cloud-init
/etc/init.d/networking restart
ok,
ipv6 config
create (see in /50-cloud-init)
nano /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg
add
network: {config: disabled}
nano /etc/sysctl.conf
add
net.ipv6.conf.all.autoconf = 0 (doc ovh)
net.ipv6.conf.all.accept_ra = 0 (doc ovh)
net.ipv4.ip_forward=0 (webmin panel)
net.ipv6.conf.default.autoconf = 0 (your post)
net.ipv6.conf.eno1.autoconf = 0 (your post)
net.ipv6.conf.default.accept_ra = 0 (your post)
net.ipv6.conf.eno1.accept_ra = 0 (your post)
sh sysctl -p (doc ovh)
result
/usr/sbin/sysctl: /usr/sbin/sysctl: cannot execute binary file
(so i choose reboot)
systemctl reboot
ok
registration of ipv6 and routing
ip addr add IPV6/64 dev IF
ip -6 route add IPV6_GATEWAY dev IF
ip -6 route add default via IPV6_GATEWAY dev IF
nano /etc/network/interfaces
iface IF inet6 static
address YOUR_IPv6
netmask 64 (or 128)
post-up /sbin/ip -f inet6 route add IPv6_GATEWAY dev IF
post-up /sbin/ip -f inet6 route add default via IPv6_GATEWAY
pre-down /sbin/ip -f inet6 route del IPv6_GATEWAY dev IF
pre-down /sbin/ip -f inet6 route del default via Ipv6_GATEWAY
/etc/init.d/networking restart
ok
(test ping)
date && ping -c 6 proof.ovh.net
ping6 -c 4 2001:4860:4860::8888 (doc ovh)
date && mtr -rbwz -c 10 -6 [ipv6 of my connection]
all ok
since my connection
date && ping6 -c 6 [server's ipv6]
date && mtr -rbwz -c 10 -6 [server's ipv6]
ok
systemctl reboot
ok
ifconfig ok
ip a ok
tests ping ok
?☺️?
Thanks for your post
Answered by BigMac-X on February 13, 2021
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