Bug 479370

IPv6 router advertisements are sent from a OpenSuSE 10.3 box by
radvd-0.9-72.  A 32bit i686 system running OpenSuSE 11.1 with an unhacked
kernel-pae-2.6.27.7-9.1 and an up-to-date package iproute2-2.6.25-41.24,
receives these router advertisements (according to tcpdump), but ignores
them, failing to configure either the host's IPv6 address or the
default route.  There are no ip6tables rules (yet).  Other v10.3 machines on
the same net do recognize and obey the router advertisements.
    By an ad-hoc script and diff I discovered:
-/proc/sys/net/ipv6/conf/all/forwarding 0 (on 10.3)
+/proc/sys/net/ipv6/conf/all/forwarding 1 (on 11.1)
When I disabled forwarding the router advertisements were obeyed 
immediately.  This control is set in /etc/init.d/boot.ipconfig (unhacked) 
according to the variable IPV6_FORWARD which is set (incorrectly) in 
/etc/sysconfig/sysctl to "yes".  The variable was set wrongly because the
file was copied from a different machine which *is* a router.
    In YaST2 under Network Devices / Network Settings / Routing, there is
a checkbox for <q>Enable IP Forwarding</q>, which affects IP_FORWARD
in /etc/sysconfig/sysctl.  Being checked because IP_FORWARD == "yes",
if I uncheck it, /etc/sysconfig/sysctl is edited so IP_FORWARD="no", but
IPV6_FORWARD remains unchanged as "yes".  This is a bug.  (Workaround: 
hand-edit the value.)  I suggest that the checkbox should affect both 
settings, or possibly there should be one checkbox for each.
    In addition, the rest of the Routing dialog should provide a similar
service level as for IPv4, that is, it should accept IPv6 routes,
and should edit /etc/radvd.conf accordingly, and should restart this 
daemon.