class IpNetwork(models.Model):
    vlan_name = models.CharField(max_length=7, verbose_name="Input name_vlan")
    ip_gw = models.IPAddressField(verbose_name="Gateway IP")
    mask = models.IPAddressField(verbose_name="Mask network")
    network = models.IPAddressField(verbose_name="Network")
    nat = models.IPAddressField(blank=True,null=True,verbose_name="IP address nat")
    gen_dhcp = models.IntegerField(choices=((0,'Deny'),(1,'Access')),default="1",verbose_name="Include dhcp.conf")
    desc = models.CharField(blank=True,null=True,max_length=100,default="",verbose_name="descriptions network")
    routers = models.IPAddressField(blank=True,null=True)

    def __unicode__(self):
        return '%s' % (self.vlan_name)

class AddClient(models.Model):
    uname = models.CharField(max_length=50,verbose_name="Input login")
    mac = models.CharField(max_length=17,verbose_name="Input mac")
    ip = models.IPAddressField()
    vlan_id = models.ForeignKey(IpNetwork, verbose_name="Select vlan")
    is_deleted = models.BooleanField('deleted', default=False)

    def __unicode__(self):
        return '%s\t%s\t%s' % (self.uname, self.ip, self.mac)

Ipnetwork.objects.get(Network = mynet)