Why is that a SUSE Linux OS will receive a new IP address everytime it is rebooted from a Windows server 2007?

4 Comments

1. rowlfe says:

   18. October 2009 at 19:48

   As far as I am concerned, this is a BUG that has existed in windoze since NT 3.51. The problem is the Windoze server is playing DHCP and it sees a new client, and fails to remember that client was there before and had an address. Check your DHCP settings to see how long it takes to expire an IP license. Most ISP’s set this limit to some long period like 24 hours, so if you are on a DSL or cable connection, you can go as long as 24 hours before getting a new address from the pool. Your IP is not released until 24 hours AFTER your connection is broken. This may NOT be the actual cause however. I only mention it because other client systems also have this same problem, a new IP each and every time they connect no matter how long or short the disconnect. I have a couple of NAS devices, standalone network drives which internally use Linux. No matter what I do with my DHCP server, they always get a new address which hoses up the shortcuts on my desktop since the shortcuts reference the NAS by IP address, NOT by common name. The strange thing is, the NAS only gets a new address if I break the NAS connection, NOT if I reset the DHCP server! This leads me to believe it might actually be a fault in Linux acting in concert with windoze. It may very well be that Linux loses the session key needed to get back the old IP address when it does a restart. The bottom line, Windoze 2007 is NOT unique in this. This has been a problem as far back as NT as far as I know. You are NOT alone in this problem. Everyone running Linux is getting it.
2. the_digital_nomad says:

   18. October 2009 at 19:48

   reboot means you started or restarted an OS – the driver that holds the IP address ‘released’ the IP (so someone else can use it on the network)

   Anytime the driver is restarted, it has to get another IP assignment.