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--- failover [2023/07/27 20:07] – created bent
+++ failover [2023/07/30 08:08] (current) – bent
@@ Line 1: / Line 1: @@
 ====== Failover ======
-ISC: [[https://kb.isc.org/docs/aa-00502|A Basic Guide...]]
+Setting up failover is fairly straightforward. There are several guides and howtos on the Internet. I used the following:
+ISC: [[https://kb.isc.org/docs/aa-00502|A Basic Guide to Configuring DHCP Failover]], and
 Steven Diver: [[https://stevendiver.com/2020/02/21/isc-dhcp-failover-configuration/|ISC DHCP Failover Configuration]]
+Here are the important sections of the respective configuration files. The Main Router has the IP address 192.168.19.1 and the Backup Router has 192.168.19.44.
+===== Main Router (Nounours) =====
+  # dhcpd.conf
+  #
+  # Configuration file for ISC dhcpd
+  #
+  # Configuration of failover
+  #
+  failover peer "failover-partner" {
+     primary;
+     address 192.168.19.1;
+     peer address 192.168.19.44;
+     max-response-delay 60;
+     max-unacked-updates 10;
+     mclt 3600;
+     split 128;
+     load balance max seconds 3;
+  }
+  .....
+  # Subnet specification for unknown clients, primarily on the WLAN
+  subnet 192.168.19.0 netmask 255.255.255.0 {
+    pool {
+      failover peer "failover-partner" ;
+      range 192.168.19.241 192.168.19.253;
+    }
+    # .254 is reserved for the 'floating' IP address of VRRP
+  }
+  # Subnet specification for IOT devices on VLAN 2
+  subnet 172.19.2.0 netmask 255.255.255.0 {
+    pool {
+      failover peer "failover-partner" ;
+      range 172.19.2.10 172.19.2.99;
+      option domain-name-servers 1.1.1.1;
+      option ntp-servers 0.dk.pool.ntp.org;
+      option ntp-servers 1.dk.pool.ntp.org;
+    }
+  }
+  ......
+===== Backup Router (Gate-rpi) =====
+The configuration of the Backup Router is almost identical to the Main Router, the difference being the specification of the partner and it not having the line 'split 128'.
+  # dhcpd.conf
+  #
+  # Configuration file for ISC dhcpd
+  #
+  # Configuration of failover
+  #
+  failover peer "failover-partner" {
+     secondary;
+     address 192.168.19.44;
+     peer address 192.168.19.1;
+     max-response-delay 60;
+     max-unacked-updates 10;
+     load balance max seconds 3;
+   }
+   ......