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IPv6 address preferred_lft stays always 86400 - why ?
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1970
n00b
n00b


Joined: 07 May 2010
Posts: 55

PostPosted: Sun Nov 20, 2016 9:30 pm    Post subject: IPv6 address preferred_lft stays always 86400 - why ? Reply with quote

Hello,

I get IPv6 router advertisements from my telco home router (Telekom Speedport W724V, appears to have Linux 2.6.30 ) to my Gentoo box. I have IPv6 privacy extensions activated. The router advertises a new ::/64 prefix every 24h, while the ::/56 prefix is unchanged until manual router reconnect

Why does the preferred lifetime value of the addresses of the interface connected with the router only decrease for a few seconds, then it jumps back to 86400 ? Did not find really much about that.

Code:

ip -6 addr show dev eno1
3: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 2003:89:af7d:bb08:41fd:f487:a781:3f43/64 scope global temporary dynamic
       valid_lft 196319sec preferred_lft 86362sec
    inet6 2003:89:af7d:bb08:7254:d2ff:7baa:49be/64 scope global mngtmpaddr dynamic
       valid_lft 604762sec preferred_lft 86362sec


It looks that my kernel settings for temporary addresses lifetime values are ignored? Here my /etc/sysctl.d/40-ipv6.conf

Code:

net.ipv6.conf.default.use_tempaddr = 2

net.ipv6.conf.all.use_tempaddr = 2

net.ipv6.conf.eno1.forwarding = 1
net.ipv6.conf.eno1.accept_ra = 2
net.ipv6.conf.eno1.use_tempaddr = 2
# preferred lifetime 50h
net.ipv6.conf.eno1.temp_prefered_lft = 180000
# valid 60h
net.ipv6.conf.eno1.temp_valid_lft = 216000


My Gentoo box has all ebuilds up to date, Kernel 4.1.12.

Best regards
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Ant P.
Watchman
Watchman


Joined: 18 Apr 2009
Posts: 5592

PostPosted: Sat Nov 26, 2016 7:23 pm    Post subject: Reply with quote

It resets the timeout every time it receives a route advertisement packet.
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