[CentOS] IPv6 range provisioning question

Shawn O'Shea shawn at ll.mit.edu
Fri Jun 12 14:12:37 UTC 2009

Filipe Brandenburger wrote:
> I really doubt that this will work with this exact syntax, as these
> are Bourne shell variable assignments and each of them will overwrite
> the previous one...
> Shouldn't it be something like this?
> IPV6ADDR_SECONDARIES="2001:0470:0103:001A::3/64
> 2001:0470:0103:001A::4/64 2001:0470:0103:001A::5/64
> 2001:0470:0103:001A::6/64 2001:0470:0103:001A::7/64
> 2001:0470:0103:001A::8/64"

Looking in /etc/sysconfig/network-scripts, a quick grep shows that 
ifup-ipv6 handles the IPV6ADDR_SECONDARIES.

The comments at the top of this file state:
#  IPV6ADDR_SECONDARIES="<IPv6 address>[/<prefix length>] ..." (optional)

so yes indeed that appears to be the correct syntax...in fact later in 
the script IPV6ADDR_SECONDARIES gets walked through in a for loop:
# Setup additional IPv6 addresses from list, if given
if [ -n "$IPV6ADDR_SECONDARIES" ]; then
         for ipv6addr in $IPV6ADDR_SECONDARIES; do
                 ipv6_add_addr_on_device $DEVICE $ipv6addr


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