[Olsr-dev] Strange debug message from olsrd

[Markus Kittenberger]

this is a warning that olsrd received the exactly same packet from one of
its neighbor more than once,..
infact olsrd received a packet with an seqnr which is identical to the
previous packet,..

known cause for example is the buggy wireless driver of routeros (if u use
for example use wds links (with bad signal) between mikrotik routerboards
you will get duplicate packets seldomly)
or maybe you built a layer 2 loop, or found another buggy hardware/device
driver,..
mdns might also produce duplicates

btw: olsrd versoins that report this, are not affected by duplicate olsr
packets (they ignore the duplicate), but older olsrd versions interprete a
duplicate packet as extreme packet loss (65535 packets lost *G) and will set
the links lq to 0,...

as you get many erros of this type, i recommend to find out what causes it,
as other software may also react bad on duplicates

Markus

On Fri, Oct 8, 2010 at 10:46 AM, Gioacchino Mazzurco
<(spam-protected)>wrote:

> Hey all on our network in Pisa we are using olsrd from stable branch, today
> reading the output of logread command i have found a lot of olsrd related
> message here is a short piece:
>
> Jan  2 16:31:20 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 32869 from fd7d:d7bb:2c97:dec3:0:23:7d29:13fa on eth0 (80 Bytes)
> Jan  2 16:31:21 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 54141 from fd7d:d7bb:2c97:dec3:0:15:f2dc:faa6 on eth0 (80 Bytes)
> Jan  2 16:31:21 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 10366 from fd7d:d7bb:2c97:dec3:0:15:6dfc:71ce on ath1 (56 Bytes)
> Jan  2 16:31:21 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 57171 from fd7d:d7bb:2c97:dec3:0:15:6dfc:71ce on ath1 (56 Bytes)
> Jan  2 16:31:22 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 32870 from fd7d:d7bb:2c97:dec3:0:23:7d29:13fa on eth0 (80 Bytes)
> Jan  2 16:31:23 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 54142 from fd7d:d7bb:2c97:dec3:0:15:f2dc:faa6 on eth0 (148 Bytes)
> Jan  2 16:31:23 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 10367 from fd7d:d7bb:2c97:dec3:0:15:6dfc:71ce on ath1 (160 Bytes)
> Jan  2 16:31:23 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 57172 from fd7d:d7bb:2c97:dec3:0:15:6dfc:71ce on ath1 (216 Bytes)
> Jan  2 16:31:24 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 32871 from fd7d:d7bb:2c97:dec3:0:23:7d29:13fa on eth0 (188 Bytes)
> Jan  2 16:31:24 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 54143 from fd7d:d7bb:2c97:dec3:0:15:f2dc:faa6 on eth0 (80 Bytes)
> Jan  2 16:31:25 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 57173 from fd7d:d7bb:2c97:dec3:0:15:6dfc:71ce on ath1 (56 Bytes)
> Jan  2 16:31:25 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 10368 from fd7d:d7bb:2c97:dec3:0:15:6dfc:71ce on ath1 (112 Bytes)
> Jan  2 16:31:25 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 32872 from fd7d:d7bb:2c97:dec3:0:23:7d29:13fa on eth0 (80 Bytes)
> Jan  2 16:31:26 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 54144 from fd7d:d7bb:2c97:dec3:0:15:f2dc:faa6 on eth0 (80 Bytes)
> Jan  2 16:31:26 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 57174 from fd7d:d7bb:2c97:dec3:0:15:6dfc:71ce on ath1 (56 Bytes)
> Jan  2 16:31:27 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 10369 from fd7d:d7bb:2c97:dec3:0:15:6dfc:71ce on ath1 (104 Bytes)
> Jan  2 16:31:27 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 32873 from fd7d:d7bb:2c97:dec3:0:23:7d29:13fa on eth0 (188 Bytes)
> Jan  2 16:31:28 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 54145 from fd7d:d7bb:2c97:dec3:0:15:f2dc:faa6 on eth0 (148 Bytes)
> Jan  2 16:31:28 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 57175 from fd7d:d7bb:2c97:dec3:0:15:6dfc:71ce on ath1 (216 Bytes)
> Jan  2 16:31:29 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 10370 from fd7d:d7bb:2c97:dec3:0:15:6dfc:71ce on ath1 (168 Bytes)
> Jan  2 16:31:29 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 32874 from fd7d:d7bb:2c97:dec3:0:23:7d29:13fa on eth0 (80 Bytes)
> Jan  2 16:31:30 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 54146 from fd7d:d7bb:2c97:dec3:0:15:f2dc:faa6 on eth0 (80 Bytes)
> Jan  2 16:31:30 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 57176 from fd7d:d7bb:2c97:dec3:0:15:6dfc:71ce on ath1 (56 Bytes)
> Jan  2 16:31:30 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 32875 from fd7d:d7bb:2c97:dec3:0:23:7d29:13fa on eth0 (80 Bytes)
> Jan  2 16:31:30 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 10371 from fd7d:d7bb:2c97:dec3:0:15:6dfc:71ce on ath1 (104 Bytes)
> Jan  2 16:31:31 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 54147 from fd7d:d7bb:2c97:dec3:0:15:f2dc:faa6 on eth0 (148 Bytes)
> Jan  2 16:31:32 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 57177 from fd7d:d7bb:2c97:dec3:0:15:6dfc:71ce on ath1 (160 Bytes)
> Jan  2 16:31:32 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 32876 from fd7d:d7bb:2c97:dec3:0:23:7d29:13fa on eth0 (188 Bytes)
> Jan  2 16:31:32 OpenWrt daemon.info olsrd[705]: detected duplicate packet
> with seqnr 10372 from fd7d:d7bb:2c97:dec3:0:15:6dfc:71ce on ath1 (168 Bytes)
>
> here is our topology http://131.114.250.100/status.php
> the node is fd7d:d7bb:2c97:dec3:0:15:6dfc:720b
>
> but i find the same message on all node of network...
> here is our typical configuration
>
>
> DebugLevel      1
>
> IpVersion       6
>
> LoadPlugin "olsrd_txtinfo.so.0.1"
> {
>   PlParam     "Accept"   "0::0"
> }
>
> LoadPlugin "olsrd_mdns.so.1.0.0"
> {
>   PlParam     "MDNS_TTL"  "10"
>
>   PlParam     "NonOlsrIf" "ath0"
>   PlParam     "NonOlsrIf" "eth0"
> }
>
> Hna6
> {
>     0::ffff:0000:0000 96
>     0::ffff:0afe:0000 112
>     0::ffff:0aaf:0000 120
> }
>
> Interface "ath1"
> {
>     Mode "mesh"
>     IPv6Multicast       FF0E::1
>     IPv6Src             fd7d:d7bb:2c97:dec3:0000:0015:6DFC:720B
> }
>
>
> Interface "eth0"
> {
>     Mode "ether"
>     IPv6Multicast       FF0E::1
>     IPv6Src             fd7d:d7bb:2c97:dec3:0000:0015:6DFD:720B
> }
>
>
> debug level is set to 1 but forced to 0 by -d param on our custom olsrd
> starting script
>
>
> --
> Olsr-dev mailing list
> (spam-protected)
> http://lists.olsr.org/mailman/listinfo/olsr-dev
>
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