Package: ndisc6
Version: 0.9.8-1
Severity: important
Tags: ipv6

Running rdisc6 (from ndisc6, version 0.9.8-1) on an amd64 host:

Soliciting ff02::2 (ff02::2) on wlan0...

Hop limit                 :          255 (      0xff)
Stateful address conf.    :           No
Stateful other conf.      :          Yes
Router preference         :       medium
Router lifetime           :         1800 (0x00000708) seconds
Reachable time            :  unspecified (0x00000000)
Retransmit time           :  unspecified (0x00000000)
 Prefix                   : <my-ipv6-prefix>::/64
  Valid time              :         7200 (0x00001c20) seconds
  Pref. time              :         3600 (0x00000e10) seconds
 MTU                      :         1472 bytes (valid)
 Source link-layer address: <router-mac>
 from <router-link-local-ipv6>

Running rdisc6 (from ndisc6, version 0.9.7-1) on a sheevaplug (armv5tel) 
host:

Soliciting ff02::2 (ff02::2) on eth0...

Hop limit                 :          255 (      0xff)
Stateful address conf.    :           No
Stateful other conf.      :          Yes
Router preference         :       medium
Router lifetime           :         1800 (0x00000708) seconds
Reachable time            :         1800 (0x00000708) milliseconds
Retransmit time           :  unspecified (0x00000000)
 Prefix                   : <my-ipv6-prefix>::/64
  Valid time              :        16576 (0x000040c0) seconds
  Pref. time              :         7200 (0x00001c20) seconds
 MTU                      :            0 bytes (invalid)
 Source link-layer address: <router-mac>
 from <router-link-local-ipv6>


Note the difference in the three lines following "Prefix".

Both hosts are connected to the same switch and get identical router 
advertisement messages over the wire. Also, both kernels manage to get 
this right. I suspect the bug has to do with the unusual struct-packing 
behaviour on arm as compared to x86.

-- 
David Härdeman



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