IPv6, ip token, NetworkManager and accept_ra
Hi fellow Debian users!
In my quest to advance the IPv6 preparedness of my home LAN I want to
find a solution to use IP tokens on all my clients. IP tokens (keeping
the host part of the IPv6 address static while getting the subnet part
by SLAAC) seem very elegant to me, because it avoids DHCPv6 completely,
and still makes mostly working DNS records possible.
Opinions on SLAAC+IP tokens are welcome ;)
One of my clients is a surface laptop running Debian sid, Gnome,
NetworkManager and getting connection via WiFi. The first hickup with
this is, that seemingly ra is disabled on my NetworkManager configured
device wl0:
root@surface:~# ip token set ::5fac dev wl0
Error: ipv6: Router advertisement is disabled on device.
This can easily corrected with
echo 1 > /proc/sys/net/ipv6/conf/wl0/accept_ra
But: Is this a misconfiguration on my machine, or to be expected, when
using NetworkManager? I am using the following settings in the GUI:
IPv5: "Disable", IPv6 "Automatic". Do I risk messing up other stuff by
manually setting this eg. with the help of /etc/sysctl.conf?
After that
ip token set ::5fac dev wl0
works just fine and I get a nice ip with the token part in it:
2: wl0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state
UP group default qlen 1000
link/ether 00:00:0f:00:00:00 brd ff:ff:ff:ff:ff:ff permaddr
6c:a1:00:20:ca:7b
inet6 2a02:ab8:201:5b8::5fac/64 scope global dynamic mngtmpaddr
proto kernel_ra
valid_lft 86394sec preferred_lft 14394sec
inet6 2a02:ab8:201:5b8:526a:2061:5984:24a/64 scope global dynamic
noprefixroute
valid_lft 86395sec preferred_lft 14395sec
inet6 fe80::6e20:1d4b:4fa:e41f/64 scope link noprefixroute
valid_lft forever preferred_lft forever
But what is the correct way to do this "ip token set" with
NetworkManager (or in spite of NetworkManager ;)?
Should I use nmcli or something else? Is there maybe even a hidden
Gnome GUI option?
Any other comments on this maybe quixotic endavour are welcome ;)
Thanks in advance,
Ralph
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