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+====== DHCP Relay and Server lab ======
+This Labs show an example of IPv4 DHCP Relay and server with BSDRP (v1.51)
+===== Presentation =====
+==== Network diagram ====
+Here is the logical and physical view:
+{{:documentation:examples:bsdrp-dhcp-relay-server.png|}}
+===== Setting-up the lab =====
+==== Downloading BSD Router Project images ====
+Download a BSDRP serial image (prevent to have to use an X display) on SourceForge.
+==== Downloading BSDRP lab scripts and starting the lab =====
+More information on these BSDRP lab scripts available on [[documentation:examples:How to build a BSDRP router lab]].
+Start a lab with 3 routers full meshed (no common LAN), example with VirtualBox script:
+<code>
+# tools/BSDRP-lab-bhyve.sh -i BSDRP-1.903-full-amd64-serial.img.xz -n 3
+BSD Router Project (http://bsdrp.net) - bhyve full-meshed lab script
+Setting-up a virtual lab with 3 VM(s):
+- Working directory: /tmp/BSDRP
+- Each VM have 1 core(s) and 256M RAM
+- Emulated NIC: virtio-net
+- Switch mode: bridge + tap
+- 0 LAN(s) between all VM
+- Full mesh Ethernet links between each VM
+VM 1 have the following NIC:
+- vtnet0 connected to VM 2
+- vtnet1 connected to VM 3
+VM 2 have the following NIC:
+- vtnet0 connected to VM 1
+- vtnet1 connected to VM 3
+VM 3 have the following NIC:
+- vtnet0 connected to VM 1
+- vtnet1 connected to VM 2
+For connecting to VM'serial console, you can use:
+- VM 1 : cu -l /dev/nmdm1B
+- VM 2 : cu -l /dev/nmdm2B
+- VM 3 : cu -l /dev/nmdm3B
+</code>
+===== Routers configuration =====
+==== VM3 (DHCP server) ====
+<code>
+sysrc hostname=VM3
+sysrc gateway_enable=NO
+sysrc ipv6_gateway_enable=NO
+sysrc ifconfig_em1="10.0.23.3/24"
+sysrc defaultrouter="10.0.23.2"
+sysrc dhcpd_enable=YES
+sysrc dhcpd_flags="-q"
+sysrc dhcpd_conf="/usr/local/etc/dhcpd.conf"
+sysrc dhcpd_ifaces="em1"
+sed -i "" 's/em/vtnet/g' /etc/rc.conf
+cat > /usr/local/etc/dhcpd.conf <<'EOF'
+subnet 10.0.23.0 netmask 255.255.255.0 {
+}
+subnet 10.0.12.0 netmask 255.255.255.0 {
+  range 10.0.12.100 10.0.12.200;
+  option routers 10.0.12.2;
+}
+'EOF'
+hostname VM3
+service netif restart
+service routing restart
+service isc-dhcpd start
+config save
+</code>
+==== VM2 (Router and DHCP Relay) ====
+<code>
+sysrc hostname=VM2
+sysrc ifconfig_em0="10.0.12.2/24"
+sysrc ifconfig_em1="10.0.23.2/24"
+sysrc dhcprelya_enable=YES
+sysrc dhcprelya_servers="10.0.23.3"
+sysrc dhcprelya_ifaces="em0"
+sed -i "" 's/em/vtnet/g' /etc/rc.conf
+hostname VM2
+service netif restart
+service routing restart
+service dhcprelya start
+config save
+</code>
+==== VM1 (DHCP client) ====
+<code>
+sysrc hostname=VM1
+sysrc ifconfig_em0="DHCP"
+sysrc gateway_enable=NO
+sysrc ipv6_gateway_enable=NO
+sed -i "" 's/em/vtnet/g' /etc/rc.conf
+hostname VM1
+service netif restart
+service routing restart
+config save
+</code>
+===== Final testing =====
+Check data received by DHCP client on VM1:
+<code>
+[root@VM1]~# ifconfig vtnet0
+vtnet0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
+        options=80028<VLAN_MTU,JUMBO_MTU,LINKSTATE>
+        ether 58:9c:fc:01:02:01
+        hwaddr 58:9c:fc:01:02:01
+        inet6 fe80::5a9c:fcff:fe01:201%vtnet0 prefixlen 64 scopeid 0x1
+        inet 10.0.12.100 netmask 0xffffff00 broadcast 10.0.12.255
+        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
+        media: Ethernet 10Gbase-T <full-duplex>
+        status: active
+[root@VM1]~# cat /var/db/dhclient.leases.vtnet0
+lease {
+  interface "vtnet0";
+  fixed-address 10.0.12.100;
+  option subnet-mask 255.255.255.0;
+  option routers 10.0.12.2;
+  option dhcp-lease-time 43200;
+  option dhcp-message-type 5;
+  option dhcp-server-identifier 10.0.23.3;
+  renew 1 2017/7/10 20:14:07;
+  rebind 2 2017/7/11 00:44:07;
+  expire 2 2017/7/11 02:14:07;
+}
+</code>