Rainer Dorsch wrote: > my fritz.box is a DSL router from AVM, which unfortunately does not give me > access to syslog.
Oh. I didn't realize that. The way you talked about it I thought it was another Debian system. > What I noticed is that 192.168.178.87 shows up without MAC address > in the list of network devices of the fritz.box That is almost certainly an important clue to the problem. > I think I will try first to get support from AVM on that topic. Good luck! However I am pessimistic about support from companies. In general they like to sell you things but unless you are a notable customer with deep pockets they tend not to want to spend time supporting you. Every vendor is unique however. In general a dhcp server will always assign the same IP address to the same client. Everyone knows this is based upon the client ethernet address. But many people do not know this is also based upon the uid the client offers. (It might be client hostname. I don't remember and have no time to research the precise thing.) If a client offers different uids then the dhcp server is obligated to assign a different IP address. The idea was that a multiple booting system would have different uids and wouldn't share the same IP address even though it had the same ethernet hardware address. Is it possible that your client is somehow producing a DHCP request but using different client parameters with the different requests and therefore receiving different IP assignments in return? Since you are getting different IP assignments and it must be for some reason then I suspect this possible case. Assuming that the dhcp server is standards conforming. Do you keep getting different IP assignments every day? > If that is not successful, I will look in more detail into the > tcpdumps (although since I have to take that on the client side, > that might be difficult during the startup phase). Note that dhcpdump can still be used on your client. It would require some patience but it would capture the exchange. Easier than wireshark and specific to the domain at hand. It would be on my list to try to capture what the differences are when getting the different IP assignments. Bob
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