Last year we had an incident where the one IP address on a client's subnet just stopped working for no reason. He's made it his mission in life to try and download the entire internet and his 384Kb uncapped sits at 384Kb 24x7x365.
One day he called our support line in a state of panic because his lan had stopped working. After much head scratching, we changed the ip address on his router's LAN port and set up a new DHCP pool. He refreshed his IP address and has been happily downloading ever since.
That was in a DHCP scenario with a "192.168" IP address.
Yesterday something similar happened to one of our servers. I ended up having to change the IP address to an available address and then had to remap everything for that server through the firewall.
Both addresses are "just dead". I've since tried to reuse Mr Internet Downloader's subnet elsewhere. It's a /29 with one address on the router and the other 5 addresses available. All the addresses work, except for the one.
I've tried setting those addresses up in XP, Win7, 2K3 Advanced server and even tried using them on MikroTik routers. It's almost as if they've been blacklisted somewhere on our network. I've checked, rechecked and checked again. I've upgraded router firmware (both Cisco and MikroTik) and I've used fresh o/s installs for test computers.
So now my question to those who know more about this than I do: Why would specific "192.168" IP addresses just die and then not be useable again?
I need to add that both IP addresses routed a good few terabytes of traffic before their untimely demise. Yesterday's address was on a mail relay server that shifted thousands of emails a day, every day.
One day he called our support line in a state of panic because his lan had stopped working. After much head scratching, we changed the ip address on his router's LAN port and set up a new DHCP pool. He refreshed his IP address and has been happily downloading ever since.
That was in a DHCP scenario with a "192.168" IP address.
Yesterday something similar happened to one of our servers. I ended up having to change the IP address to an available address and then had to remap everything for that server through the firewall.
Both addresses are "just dead". I've since tried to reuse Mr Internet Downloader's subnet elsewhere. It's a /29 with one address on the router and the other 5 addresses available. All the addresses work, except for the one.
I've tried setting those addresses up in XP, Win7, 2K3 Advanced server and even tried using them on MikroTik routers. It's almost as if they've been blacklisted somewhere on our network. I've checked, rechecked and checked again. I've upgraded router firmware (both Cisco and MikroTik) and I've used fresh o/s installs for test computers.
So now my question to those who know more about this than I do: Why would specific "192.168" IP addresses just die and then not be useable again?
I need to add that both IP addresses routed a good few terabytes of traffic before their untimely demise. Yesterday's address was on a mail relay server that shifted thousands of emails a day, every day.
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