I have a network with over 100 users. All IP's, except my firewall, on the network resolve to AMontpellier-257-1-113-2.w90-0.abo.wanadoo.fr, an ISP in Montpellier, France. I am in Canada and have no association with Wanadoo. This issue has been going on longer than I have been at this company and so I have no idea how it started. I have checked my DNS server for any entries to Wanadoo and found nothing. All DNS entries seem fine.
I dont know how specific you need me to be about my setup but I am running three servers, one win2k, and two win2k3. All pcs have computer names and are joined to the domain. When I ping -a any ip I get AMontpellier-257-1-113-2.w90-0.abo.wanadoo.fr as the name, except the firewall which resolves properly.
Please let me know if you need more info than that. Thanks.