I have an issue with my home wireless network which is baffling me. I have AT&T wireless network and use the company provided wireless dhcp server. It has a connection through an old 100Mbit switch with 3 computers hooked to it. These "wired" computers never have a problem and get the appropriate dhcp addresses every time. I also have 3 laptops - all windows 7 machines - which connect through the wireless connection. In addition, there are 2 I-Phones, a Blackberry, and another Samsung phone that connect through the wireless connection. All work fine ALMOST all of the time. Every once in a while, one of the i-phones or laptops will get a DHCP address of 192.168.203.xxx with a Router of 192.168.203.2, a DNS of 192.168.203.2, and a "Search Domains" on the i-phones and i-pads of "localdomain". The MAC Book as well as the Windows 7 laptop will get this on occasion as well. I HAVE NO IDEA WHERE IT IS GETTING THESE ADDRESSES FROM!! Not only that, I can't get rid of this dhcp address very easily. On the windows 7 boxes, I can do an ipconfig /flushdns, disable the network card, then reenable the network card and MOST of the time it will then get the correct IP address of 192.168.1.xxx. I may have to do this several times to make it work. I can do similar functions on the MAC to make it release the DNS and IP then make it get a new one that is correct. On the I-PAD and I-Phones I sometimes have to remove the link to the wireless completely and then put it in as a new wireless connection to get it to pick up the correct DHCP addressing. I have no clue where it is getting this address from. This was happening when I was with Time Warner as a provider and has continued to be an issue with AT&T as a provider. I have reviewed the VMWare configurations I have as well as completely shut off these configurations which only exist on my personal laptop. Every trace I try to do to find where this is coming from gives me nothing back. Is there some tool I can use to figure out where this is coming from? This is driving me nuts! Its so intermittent and hard to pinpoint a specific cause. I know I'm connecting to MY Wireless Network and know it isn't coming from another network connection. Anyone have any idea what could cause this? When this does happen, it appears to affect any wireless network device which may not have been on the network for a while. It doesn't seem to affect those that were connected fairly consistently, but if the device has been off the network for more than 6 hours, it could be affected. When it happens, it usually affects 2 or 3 of the devices all at once - couple of the i-phones and maybe the MAC or one of the laptops.
Any help or insight on this would be appreciated.