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Posted by / 11-Nov-2017 03:37

Dhcp not updating lease

Below log confirms the renewal happens every defined interval, Apr 29 dhclient[12270]: DHCPREQUEST on mgmt1 to 192.168.10.2 port 67 (xid=0x2b10e716)Apr 29 dhclient[12270]: DHCPACK from 192.168.10.2 (xid=0x2b10e716)Apr 29 dhclient[12270]: bound to 192.1 -- renewal in 31 seconds.[[email protected]]# cat /var/lib/dhclient/dhclient-mgmt1.leaseslease Lease file updation happens properly after the defined expiry interval, but the problem is with classless-static-routes, if there is any change with the parameter ("classless-static-routes" new gateway) leases file holds the updated information but not the routing table, can see that from the below table:[[email protected]]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface169.254.169.254 255.255.255.255 UGH 0 0 0 mgmt1Leases file hold the updated information but routing table is not aware of the change happened within the existing route.Questions:should dhcp-client script update the routing table as well if any change that happens with the existing route information? DHCP client version : [[email protected] ~]# dhclient --version to get current and retest afterwards.However, these "dynamic" DNS records expire after some time (a few weeks)...How can the DHCP be configured to refresh the DNS records after a given time interval?I have an Iogear usb wifi in my rpi, that connects just fine with my d-link router. If I ifdown/ifup wlan0, it also gets an IP address via DHCP.And if I enter dhclient -v wlan0 while the lease is still up, that appears to work as well, according to the output.The DNS Forwarder option "Register DHCP leases in DNS forwarder" does not work. I'm seeing the same as here: can tell you why the leases aren't going in /etc/hosts and have a pretty simple fix (although it's so shallow I'm not even going to post a patch file).

While everything seems to functioning correctly, the management GUI and "show dhcp leases" in the CLI both report "No leases assigned.": Looking at the file (attached) it appears the service is responding to DHCP requests... Is not reporting active leases a known issues with the new implementation, or is there something wrong with my setup that will start showing up as my leases begin to expire?

Information The steps in this post shows how to configure the DHCP server to automatically update the DNS records when giving out a new lease to a client computer. Before continuing These steps assumes that you already have a working copy of isc-dhcp-server and bind9 installed.

If you don’t have that I suggest that you first read my two other posts on how to install them: Setting up a DNS for the local network on the Ubuntu 12.04 (Precise Pangolin) server Setting up a DHCP server on Ubuntu 12.04 (Precise Pangolin) server Step by step instructions Apparently the Ubuntu server is installed with an App Armor profile that prevents bind to write to the /etc/bind directory.

The default profile suggests that these files should be put in /var/lib/bind.

If you have followed the steps in my previous post you might have your zone database files in /etc/bind/zones.

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I have to type: "ifup wlan0" to get it to renew the lease.

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