debian 9 lxc container very slow to start

[Dgonneau]

Hi,

New to proxmox, I've installed the latest version (5.1) and started creating vm's and ct's.
My concern is when I create a ct based on debian9 or if I upgrade a debian8 ct to debian9, the ct is very slow to start. It only let me ssh to it 2 or 3 minutes after I start it, with a fresh debian !
A ct with debian 8 only takes few seconds to start.

Is it normal ? is something wrong with my proxmox install ? (it is based on debian9.1 afaik)

 

[Dgonneau]

I think I just found the problem. When I don't use dhcp and us a static ipv4, the lxc with debian9 starts as fast as debian8.
I guess there is something changed on the debian code that makes the dhcp behave strangely on my network ...

 

[SamTzu]

Can confirm this. (Test LAN network no IPv6 DHCP server.)
With LXC container configure to use DHCP with IPv6 the container just keeps trying to find IPv6 address for-everrrrr...

Sam