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It's possible that they're using some fingerprinting algorithm (i.e. the particular behavior of that ethernet interface such as timing etc.) to determine that the physical host has changed, or they could be polling the various ports on the router (I believe this is possible using SNMP) to determine that it has changed in too short a timeframe. Think of this ...


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You can delete the /var/lib/dhcp/dhcp.leases file. A good time to do it would be just after a re-boot, before any clients obtain a lease. The dhcpd server will try to re-use old leases as much as possible, and will use unused IP addresses from the pool before using even expired leases. The advantage is users will tend to get the same IP address, even if ...


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Windows guy here, this is my problem with Linux: I need to know what my DNS server is, for trouble shooting. This is such a basic system administrative need, having to Google tons of solutions, and none work. I am now 30 minutes into my quest, and I still don't know what my DNS server is. Ubuntu is running, I have a working network connection too, but ...


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I guess if you comment out these lines it should start fine. ddns-update-style none; default-lease-time 600; max-lease-time 7200; authoritative; log-facility local7; option broadcast-address 192.168.1.255; option routers 192.168.1.254; #option domain-name-servers-192.168.2.1; #option domain-name "ttc.com"; subnet 192.168.1.0 netmask 255.255.255.0 { range ...


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There are multiple options depending on your needs. bind can be configure with the $GENERATE directive to fill in a range of entries. This works well if you only want entries that are IP address related. Many dhcp clients can be configured to register their lease with a DNS server. This does introduce some security risk, so it is best to use a dedicated ...


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Are you sure the network does only use the MAC-address for security? Modern Network Access Control (NAC) Systems use much more than just the MAC, e.g. agents on the connecting system that ensure compliance, authentication either password- or certificate-based, etc.



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