Comment 1 for bug 1027051

I have no idea what IRF is, but ipdevpoll is apparently making some incorrect assumptions about the resulting data from an ARP/ND collection. I won't be able to reproduce the problem with our equipment, but I will try to write some unit tests to produce the same error.

I'm pasting the relevant tracebacks from your log here, for future reference.

This:

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 318, in callback
    self._startRunCallbacks(result)
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 424, in _startRunCallbacks
    self._runCallbacks()
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 441, in _runCallbacks
    self.result = callback(self.result, *args, **kw)
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 949, in gotResult
    _inlineCallbacks(r, g, deferred)
--- <exception caught here> ---
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 893, in _inlineCallbacks
    result = g.send(result)
  File "/usr/lib/pymodules/python2.6/nav/ipdevpoll/plugins/arp.py", line 80, in handle
    if not ipv6_address_in_mappings(mappings):
  File "/usr/lib/pymodules/python2.6/nav/ipdevpoll/plugins/arp.py", line 232, in ipv6_address_in_mappings
    if ip.version() == 6:
exceptions.AttributeError: 'NoneType' object has no attribute 'version'

and this:

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 345, in errback
    self._startRunCallbacks(fail)
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 424, in _startRunCallbacks
    self._runCallbacks()
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 441, in _runCallbacks
    self.result = callback(self.result, *args, **kw)
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 949, in gotResult
    _inlineCallbacks(r, g, deferred)
--- <exception caught here> ---
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 891, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/usr/lib/python2.6/dist-packages/twisted/python/failure.py", line 338, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/usr/lib/pymodules/python2.6/nav/ipdevpoll/plugins/arp.py", line 95, in handle
    yield self._process_data(mappings)
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 893, in _inlineCallbacks
    result = g.send(result)
  File "/usr/lib/pymodules/python2.6/nav/ipdevpoll/plugins/arp.py", line 121, in _process_data
    self._make_new_mappings(new_mappings)
  File "/usr/lib/pymodules/python2.6/nav/ipdevpoll/plugins/arp.py", line 190, in _make_new_mappings
    arp.ip = ip.strCompressed()
exceptions.AttributeError: 'NoneType' object has no attribute 'strCompressed'