Re: v6 troubles ("cannot forward")

[David Young <dyoung%pobox.com@localhost>]

On Fri, Sep 26, 2008 at 12:50:38PM +0200, Ignatios Souvatzis wrote:
> On Fri, Sep 26, 2008 at 05:18:56AM -0400, der Mouse wrote:
> 
> > eval ifalias_$iface\_1='"inet6 2610:98:0:ffff::1 prefixlen 127"'
> 
> This looks fishy. "ifconfig .... alias" has only a meaning for 
> IPv4 - in IPv6, there isn't any hierarchy between the different
> addresses an interface might have. I suspect this might be a 
> problem. Make the IPv6 address a non-alias for a test. (It
> doesn't need to be one.)

For IPv6, 'alias' will not make any difference one way or another.

Strictly speaking, there is no "hierarchy" of IPv4 addresses[1].
For IPv4, 'alias' roughly means, "add to the end of the interface
address list," while omission of 'alias' and '-alias' both roughly mean,
"replace the first address on the interface address list."

Dave

[1] You can configure a "hierarchy" of addresses, if you have compiled
    your kernel with 'options IPSELSRC'.

-- 
David Young             OJC Technologies
dyoung%ojctech.com@localhost      Urbana, IL * (217) 278-3933 ext 24