Bug 250921

Can you check, whether always the last address in list is used?

Perhaps the problem is related to:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=199862

BTW: which kernel do you use?

I think it's the address assigned *first* (with the correct scope) that gets
used - but I'm not sure now! I can't see any relationship between the order
they're added and the order they're listed by "ifconfig eth0" either.

I agree, this problem is definitely related to bug 199862; I think combining the
two gives us this order of preference for choosing the outgoing address, which
handles all the scenarios I can think of for making outbound connections from a
specific/random address as desired, without the need for an additional
IPV6_AUTOCONF_PREFER setting as I suggested earlier...

1) The primary address from IPV6ADDR, if the scope is correct
2) An auto-generated address, if one is found with the correct scope
3) An address from IPV6ADDR_SECONDARIES with the correct scope

I think we should duplicate this bug to bug 199862 with a note to that effect -
would you agree?

I am currently running:
Linux detritus.local 2.6.20-1.2948.fc6 #1 SMP Fri Apr 27 19:18:54 EDT 2007
x86_64 x86_64 x86_64 GNU/Linux

Yes, this was my same experience. "ip addr add..." adds IPv6 addresses in a for
me strange stack order, means last added one occurs as first one in list and
will be used as default for outgoing connections. Tested on RHEL5 today. So my
note in https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=250921#c1 was a
little bit wrong, the *first* in the "ip addr -6" list is used, usually the last
one in the  IPV6ADDR_SECONDARIES variable.

@Pekka: is there a way to prefer existing addresses? Otherwise we have to detect
&  remove the autogenerated one and add it at last one to become the first in
list again.

I tried to extend the scripts, result is: CANTFIX

Reason: mix of autogenerated addresses via receiving router advertisements and
static addresses results in an unpredictable list. It's e.g. not possible to
prefer a manual IPv6 address during interface restart, because RA is received
later resulting in generation of the automatic address.

We can now discuss, whether we should disable accepting router advertisements at
all, if a manual address is given - this can be done by an easy patch (one line):

@@ -251,6 +252,7 @@
 # Setup IPv6 address on specified interface
 if [ -n "$IPV6ADDR" ]; then
        ipv6_add_addr_on_device $DEVICE $IPV6ADDR || exit 1
+       IPV6_AUTOCONF="no"
 fi
 
 # Get current global IPv6 forwarding

AFAIK, there is no way to prefer one address of an interface over another,
though MIPv6 framework (merged in 2.6.21 or thereabouts) includes a way to do
that, at least partially.  But I don't think it's applicable here.

I suppose IPV6_AUTOCONF could work (provided it will still set a default route
even if no addresses are configured), but that might occur too late in the
process as well -- autoconf on a device would need to be disabled before it's
brought back.

@Pekka: regarding your second comment, you're probably right, but should be
solvable, too with a similar solution used for tempaddr toggle (in the pre-step).

I hope, "accept_ra" will only control creation of autoconf address, on at least
2.6.22, following toggles are existing:

net.ipv6.conf.eth0.accept_ra = 1
net.ipv6.conf.eth0.accept_ra_defrtr = 1
net.ipv6.conf.eth0.accept_ra_pinfo = 1
net.ipv6.conf.eth0.accept_ra_rtr_pref = 1
net.ipv6.conf.eth0.accept_ra_rt_info_max_plen = 0

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Issue still exists on F8 with kernel 2.6.24.3-48.fc8

@Reporter: please update version to 8

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I think this is still an issue with 12.

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Fedora 12 changed to end-of-life (EOL) status on 2010-12-02. Fedora 12 is 
no longer maintained, which means that it will not receive any further 
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of 
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Thank you for reporting this bug and we are sorry it could not be fixed.

Sorry for delay, confirming this still exists in F13.

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Fedora 13 changed to end-of-life (EOL) status on 2011-06-25. Fedora 13 is 
no longer maintained, which means that it will not receive any further 
security or bug fix updates. As a result we are closing this bug.

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Fedora please feel free to reopen this bug against that version.

Thank you for reporting this bug and we are sorry it could not be fixed.