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Agh... after much frustration and packet captures... this wasn't an Ubuntu problem. Turns out, somehow DHCP Snooping got enabled on the upstream Cisco switch and we had no trusted interfaces defined.


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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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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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Please be more precise about your Internet-Connection. First of all the tutorial uses a normal internal network on eth0 with a private subnet. Your's is set to dhcp. Are you sure you can get into the internet at all? Does eth0 on the gw machine get an ip address? Check this with ip a if it does, then try to ping and resolve google on the gw machine ...


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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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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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As Mark Plotnick pointed out in the comments /etc/network/interface does nothing if the system is using Network Manager. I instead set a static IP for the wired address in the Network Manager (Connections Menu ⇒ Edit Connections) and things now seem to work.


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See http://askubuntu.com/a/63163/267945 - much better solution: If you want to override or append to the name servers suggested by the DHCP server, you can configure this in /etc/dhcp/dhclient.conf, eg: interface "eth0" { prepend domain-name-servers 10.0.0.2; }


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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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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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First of all this is a UBUNTU-Site and not a Microsoft-Site. So why would you ask to have it installed on Windows-System. The person you were looking for has installed it on Ubuntu in combo with wine, thats a little bit different. I still have a recommendation though, try it with DOSBOX. http://www.dosbox.com/download.php?main=1


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If you know network address of your printer and there is no network problems accessing it, you can add a printer using CUPS web interface: http://localhost:631 or: http://your_server:631


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To get distinct subnet ip addresses for your wifi devices from your lan devices, if you have multiple wifi routers you should connect them to seperate hub or switch connecting it to one of interfaces of your DHCP server say eth1 Other interface say eth0 will be connected to the switch which is having all lan device connected to it. Now Lets start with ...


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First select Interface card sudo nano /etc/default/isc-dhcp-server # Defaults for isc-dhcp-server initscript # sourced by /etc/init.d/isc-dhcp-server # installed at /etc/default/isc-dhcp-server by the maintainer scripts # # This is a POSIX shell fragment # # Path to dhcpd's config file (default: /etc/dhcp/dhcpd.conf). #DHCPD_CONF=/etc/dhcp/dhcpd.conf # ...



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