IPv6 routes via /etc/network/routes only works on redhat

[igalic]

redhat directly uses ip. debian uses ifupdown-extra. a byzantine set of scripts:

igalic@app02 ~> sudo -H ifdown eth0; sudo -H ifup eth0
Waiting for DAD... Done
/etc/network/if-up.d/00check-network-cable: 72: local: detected:: bad variable name
run-parts: /etc/network/if-up.d/00check-network-cable exited with return code 2
arping: unknown host 2a01:4f8:211:9d6::36
igalic[1082]: ERROR: Duplicate address 2a01:4f8:211:9d6::36 assigned in the network where eth0 is connected to.
2a01:4f8:211:9d6:53::: Unknown host
arping: unknown host 2a01:4f8:211:9d6::2
igalic[1097]: ERROR: Cannot find default gateway 2a01:4f8:211:9d6::2 in the network where eth0 is connected to
igalic@app02 ~>

so IPv6 doesn't actually work on debian. The way to do that in debian would be, again, through network/interfaces. (which, again, uses ip)