Multiple nested foreign key relationships in Django

I'm trying to get an object that traverses 2 models that have a reverse foreign key relationship. I've been able to get the object of the first model (ipv4address), but not able to get the object linked to it with a reverse foreign key. I'm new to django, so I might get this kind of error at first. Any suggestions are welcome.

I pass all peer objects to the template like this:

    def view_ix(request, ix):
            peers = Peer.objects.filter(exchange=ix).order_by('asn')
            return render_to_response('view_ix.html', {
                                                    'peers': peers,
                                                    'exchange' : ix,
                                                    'exchanges' : exchanges.list(),
                                            }, context_instance = RequestContext(request))

role model:

    class Peer(models.Model):
            exchange                = models.CharField(max_length=50)
            organisation            = models.CharField(max_length=200)
            contact                 = models.EmailField(max_length=254)
            asn                     = models.IntegerField()
            def __unicode__(self):
                    return  unicode(self.asn) + '\t' + unicode(self.organisation)

    class IPv4Address(models.Model):
            peer                    = models.ForeignKey(Peer)
            ip                      = models.GenericIPAddressField(protocol='IPv4')
            def __unicode__(self):
                    return  unicode(self.peer) + '\t' + unicode(self.ip)

    class Router(models.Model):
            name            = models.CharField(max_length=50)
            fqdn            = models.CharField(max_length=50)
            snmpport        = models.IntegerField()
            snmpcommunity   = models.CharField(max_length=50)
            def __unicode__(self):
                    return  unicode(self.name)

    class PeerStatus(models.Model):
            router          = models.ForeignKey(Router)
            ipv4address     = models.ForeignKey(IPv4Address)
            state           = models.IntegerField()

template:

    {% for peer in peers %}
            {% for ipv4 in peer.ipv4address_set.all %}
                ipv4: {{ ipv4.ip }}<br>
                {% for state in ipv4.peerstatus_set.all %}
                    state: {{ state.state }}<br>
                {% endfor %}
            {% endfor %}
    {% endfor %}