[radvd-devel-l] Wrongly picks and advertises /80 IPs

[Roman Mamedov]

On Tue, 26 Feb 2013 07:29:46 -0800
Reuben Hawkins <reubenhwk at gmail.com> wrote:

> Hi Roman,
> 
> Why should RADVD not advertise the /80?  It's in the config file and it
> appears to be enabled?  What am I missing?

This is the config file:

 interface eth1.2 {
     AdvSendAdvert on;
     AdvManagedFlag on;
     AdvLinkMTU 1492;
     prefix ::/64 { };
     RDNSS fd39::39 { };
     DNSSL romanrm.ru romanrm.net romanrm.hk version6.ru { };
 };

As you can see /80 is not in it. What you see below in the original message,
is the output of "radvdump" from a LAN client.


> 
> Thanks,
> Reuben
> 
> 
> On Sat, Feb 16, 2013 at 9:04 AM, Reuben Hawkins <reubenhwk at gmail.com> wrote:
> 
> > Hi Roman,
> >
> > Thanks for the bug report.  I'll look into it when I get some surplus time.
> >
> > Thanks,
> > Reuben
> >
> >
> > On Fri, Feb 15, 2013 at 5:55 AM, Roman Mamedov <rm at romanrm.ru> wrote:
> >
> >> Hello,
> >>
> >> radvd.conf:
> >>
> >> interface eth1.2 {
> >>     AdvSendAdvert on;
> >>     AdvManagedFlag on;
> >>     AdvLinkMTU 1492;
> >>     prefix ::/64 { };
> >>     RDNSS fd39::39 { };
> >>     DNSSL romanrm.ru romanrm.net romanrm.hk version6.ru { };
> >> };
> >>
> >> Interface:
> >>
> >> eth1.2    Link encap:Ethernet  HWaddr 00:60:6e:20:25:99
> >>           inet addr:192.168.2.39  Bcast:192.168.2.255  Mask:255.255.255.0
> >>           inet6 addr: 2a02:2698:xxxx:xxxx:fff2::39/80 Scope:Global
> >>           inet6 addr: fd39:0:2::39/64 Scope:Global
> >>           inet6 addr: fe80::260:6eff:fe20:2599/64 Scope:Link
> >>           UP BROADCAST RUNNING MULTICAST  MTU:1492  Metric:1
> >>           RX packets:5577 errors:0 dropped:0 overruns:0 frame:0
> >>           TX packets:4016 errors:0 dropped:0 overruns:0 carrier:0
> >>           collisions:0 txqueuelen:0
> >>           RX bytes:477626 (466.4 KiB)  TX bytes:434209 (424.0 KiB)
> >>
> >>
> >> radvdump on the client:
> >>
> >> #
> >> # radvd configuration generated by radvdump 1.8.5
> >> # based on Router Advertisement from fe80::260:6eff:fe20:2599
> >> # received by interface eth1
> >> #
> >>
> >> interface eth1
> >> {
> >>         AdvSendAdvert on;
> >>         # Note: {Min,Max}RtrAdvInterval cannot be obtained with radvdump
> >>         AdvManagedFlag on;
> >>         AdvOtherConfigFlag off;
> >>         AdvReachableTime 0;
> >>         AdvRetransTimer 0;
> >>         AdvCurHopLimit 64;
> >>         AdvDefaultLifetime 1800;
> >>         AdvHomeAgentFlag off;
> >>         AdvDefaultPreference medium;
> >>         AdvLinkMTU 1492;
> >>         AdvSourceLLAddress on;
> >>
> >>         prefix fd39:0:2::/64
> >>         {
> >>                 AdvValidLifetime 86400;
> >>                 AdvPreferredLifetime 14400;
> >>                 AdvOnLink on;
> >>                 AdvAutonomous on;
> >>                 AdvRouterAddr on;
> >>         }; # End of prefix definition
> >>
> >>
> >>         prefix 2a02:2698:xxxx:xxxx:fff2::/80
> >>         {
> >>                 AdvValidLifetime 86400;
> >>                 AdvPreferredLifetime 14400;
> >>                 AdvOnLink on;
> >>                 AdvAutonomous on;
> >>                 AdvRouterAddr on;
> >>         }; # End of prefix definition
> >>
> >>
> >>         RDNSS fd39::39
> >>         {
> >>                 AdvRDNSSLifetime 600;
> >>         }; # End of RDNSS definition
> >>
> >>
> >>         DNSSL romanrm.ru romanrm.net romanrm.hk version6.ru
> >>         {
> >>                 AdvDNSSLLifetime 600;
> >>         }; # End of DNSSL definition
> >>
> >> }; # End of interface definition
> >>
> >> -----
> >>
> >> The config clearly states "prefix ::/64".
> >> RADVD should not have picked the /80 IP to advertise as a /80 prefix.
> >> This IP should have been ignored.
> >> This particular IP was never intended by me for RA, and the client
> >> now spams the log with
> >>
> >> [338607.660000] IPv6 addrconf: prefix with wrong length 80
> >> [338623.680000] IPv6 addrconf: prefix with wrong length 80
> >> [338639.710000] IPv6 addrconf: prefix with wrong length 80
> >>
> >>
> >> --
> >> With respect,
> >> Roman
> >>
> >> --
> >> radvd-devel-l mailing list  :  radvd-devel-l at litech.org
> >> http://lists.litech.org/listinfo/radvd-devel-l
> >>
> >
> >


-- 
With respect,
Roman
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