Relay
This scenario shows how to configure service dhcp-relay. The
relay agent must be used when the DHCP server and the DHCP
clients are not connected to the same layer 2 domain.
Test DHCP Relay
Description
This example demonstrates how to configure a DHCP relay instance in DUT0 to forward DHCP requests from DUT2 to DUT1.
Scenario
Step 1: Set the following configuration in DUT0 :
set interfaces ethernet eth0 vif 100 address 10.0.0.2/24 set interfaces ethernet eth1 vif 200 address 20.0.0.2/24 set service dhcp-relay INS downstream-interface eth1.200 set service dhcp-relay INS server 10.0.0.1 set service dhcp-relay INS upstream-interface eth0.100 set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 2: Set the following configuration in DUT1 :
set interfaces ethernet eth0 vif 100 address 10.0.0.1/24 set protocols static route 0.0.0.0/0 next-hop 10.0.0.2 set service dhcp-server shared-network dummy subnet 10.0.0.1/32 set service dhcp-server shared-network remote subnet 20.0.0.0/24 start 20.0.0.50 stop 20.0.0.50 set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 3: Set the following configuration in DUT2 :
set interfaces ethernet eth0 vif 200 address dhcp set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 4: Ping IP address 10.0.0.1 from DUT0:
admin@DUT0$ ping 10.0.0.1 count 1 size 56 timeout 1Show output
PING 10.0.0.1 (10.0.0.1) 56(84) bytes of data. 64 bytes from 10.0.0.1: icmp_seq=1 ttl=64 time=0.229 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.229/0.229/0.229/0.000 ms
Step 5: Run command interfaces ethernet show at DUT2 and check if output contains the following tokens:
20.0.0.50Show output
--------------------------------------------------------------------- Name IP Address Admin Oper Vrf Description --------------------------------------------------------------------- eth0 fe80::dcad:beff:feef:6c20/64 up up eth0.200 20.0.0.50/24 up up fe80::dcad:beff:feef:6c20/64 eth1 down down
Test DHCP Relay With Giaddr
Description
This example demonstrates how to set the gateway IP address (giaddr) in the IP address. This value must be set in an IP address that the DHCP server can reach.
Scenario
Step 1: Set the following configuration in DUT0 :
set interfaces ethernet eth0 vif 100 address 10.0.0.2/24 set interfaces ethernet eth1 vif 200 address 20.0.0.2/24 set interfaces ethernet eth1 vif 200 address 20.0.0.3/24 set service dhcp-relay INS downstream-interface eth1.200 set service dhcp-relay INS server 10.0.0.1 giaddr 20.0.0.3 set service dhcp-relay INS upstream-interface eth0.100 set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 2: Set the following configuration in DUT1 :
set interfaces ethernet eth0 vif 100 address 10.0.0.1/24 set protocols static route 0.0.0.0/0 next-hop 10.0.0.2 set service dhcp-server shared-network dummy subnet 10.0.0.1/32 set service dhcp-server shared-network remote subnet 20.0.0.0/24 start 20.0.0.50 stop 20.0.0.50 set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 3: Set the following configuration in DUT2 :
set interfaces ethernet eth0 vif 200 address dhcp set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 4: Ping IP address 10.0.0.1 from DUT0:
admin@DUT0$ ping 10.0.0.1 count 1 size 56 timeout 1Show output
PING 10.0.0.1 (10.0.0.1) 56(84) bytes of data. 64 bytes from 10.0.0.1: icmp_seq=1 ttl=64 time=1.62 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 1.618/1.618/1.618/0.000 ms
Step 5: Run command interfaces ethernet show at DUT2 and check if output contains the following tokens:
20.0.0.50Show output
--------------------------------------------------------------------- Name IP Address Admin Oper Vrf Description --------------------------------------------------------------------- eth0 fe80::dcad:beff:feef:6c20/64 up up eth0.200 20.0.0.50/24 up up fe80::dcad:beff:feef:6c20/64 eth1 down down
Step 6: Run command system journal show | cat at DUT1 and check if output matches the following regular expressions:
DHCPACK on 20.0.0.50 to [^\)]+\) via 20.0.0.3Show output
Jun 20 15:33:00.299107 osdx systemd-journald[1554]: Runtime Journal (/run/log/journal/6007ddf378ad466885280cbf52ccf316) is 1.0M, max 7.2M, 6.2M free. Jun 20 15:33:00.302247 osdx systemd-journald[1554]: Received client request to rotate journal, rotating. Jun 20 15:33:00.302316 osdx systemd-journald[1554]: Vacuuming done, freed 0B of archived journals from /run/log/journal/6007ddf378ad466885280cbf52ccf316. Jun 20 15:33:00.309663 osdx OSDxCLI[170436]: User 'admin' executed a new command: 'system journal clear'. Jun 20 15:33:00.531344 osdx OSDxCLI[170436]: User 'admin' executed a new command: 'system coredump delete all'. Jun 20 15:33:02.112488 osdx OSDxCLI[170436]: User 'admin' entered the configuration menu. Jun 20 15:33:02.206968 osdx OSDxCLI[170436]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Jun 20 15:33:02.279608 osdx OSDxCLI[170436]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Jun 20 15:33:02.380660 osdx OSDxCLI[170436]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network remote subnet 20.0.0.0/24 start 20.0.0.50 stop 20.0.0.50'. Jun 20 15:33:02.440485 osdx OSDxCLI[170436]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Jun 20 15:33:02.564620 osdx OSDxCLI[170436]: User 'admin' added a new cfg line: 'show working'. Jun 20 15:33:02.638376 osdx ubnt-cfgd[233961]: inactive Jun 20 15:33:02.663218 osdx INFO[233971]: FRR daemons did not change Jun 20 15:33:02.682237 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Jun 20 15:33:02.706554 osdx (udev-worker)[234018]: Network interface NamePolicy= disabled on kernel command line. Jun 20 15:33:02.830623 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Jun 20 15:33:02.832988 osdx cfgd[1254]: [170436]Completed change to active configuration Jun 20 15:33:02.835083 osdx dhcpd[234088]: Wrote 0 leases to leases file. Jun 20 15:33:02.845191 osdx OSDxCLI[170436]: User 'admin' committed the configuration. Jun 20 15:33:02.858766 osdx dhcpd[234088]: Jun 20 15:33:02.858773 osdx dhcpd[234088]: No subnet declaration for eth0 (no IPv4 addresses). Jun 20 15:33:02.858776 osdx dhcpd[234088]: ** Ignoring requests on eth0. If this is not what Jun 20 15:33:02.858779 osdx dhcpd[234088]: you want, please write a subnet declaration Jun 20 15:33:02.858782 osdx dhcpd[234088]: in your dhcpd.conf file for the network segment Jun 20 15:33:02.858785 osdx dhcpd[234088]: to which interface eth0 is attached. ** Jun 20 15:33:02.858790 osdx dhcpd[234088]: Jun 20 15:33:02.862891 osdx OSDxCLI[170436]: User 'admin' left the configuration menu. Jun 20 15:33:02.866374 osdx dhcpd[234088]: Server starting service. Jun 20 15:33:03.541806 osdx dhcpd[234088]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.3 Jun 20 15:33:04.542057 osdx dhcpd[234088]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.3 Jun 20 15:33:04.542724 osdx dhcpd[234088]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.3 Jun 20 15:33:04.566160 osdx dhcpd[234088]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.3
Test DHCP Relay With GRE Tunnel
Description
This example demonstrates how to configure a DHCP relay that forwards DHCP requests to the DHCP server through a GRE tunnel (upstream).
Scenario
Step 1: Set the following configuration in DUT0 :
set interfaces ethernet eth0 vif 100 address 10.0.0.2/24 set interfaces ethernet eth1 vif 200 address 20.0.0.2/24 set interfaces tunnel tun1 address 1.0.0.2/32 set interfaces tunnel tun1 encapsulation gre set interfaces tunnel tun1 local-address 10.0.0.2 set interfaces tunnel tun1 local-interface eth0.100 set interfaces tunnel tun1 nhrp holdtime 5 set interfaces tunnel tun1 nhrp nhs 1.0.0.1 nbma 10.0.0.1 set service dhcp-relay INS downstream-interface eth1.200 set service dhcp-relay INS server 1.0.0.1 set service dhcp-relay INS upstream-interface eth0.100 set service dhcp-relay INS upstream-interface tun1 set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 2: Set the following configuration in DUT1 :
set interfaces ethernet eth0 vif 100 address 10.0.0.1/24 set interfaces tunnel tun1 address 1.0.0.1/32 set interfaces tunnel tun1 encapsulation gre set interfaces tunnel tun1 local-address 10.0.0.1 set interfaces tunnel tun1 local-interface eth0.100 set interfaces tunnel tun1 nhrp set protocols static route 0.0.0.0/0 next-hop 10.0.0.2 set protocols static route 20.0.0.0/24 next-hop 1.0.0.2 set service dhcp-server shared-network dummy subnet 1.0.0.1/32 set service dhcp-server shared-network remote subnet 20.0.0.0/24 start 20.0.0.50 stop 20.0.0.50 set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 3: Set the following configuration in DUT2 :
set interfaces ethernet eth0 vif 200 address dhcp set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 4: Ping IP address 10.0.0.1 from DUT0:
admin@DUT0$ ping 10.0.0.1 count 1 size 56 timeout 1Show output
PING 10.0.0.1 (10.0.0.1) 56(84) bytes of data. 64 bytes from 10.0.0.1: icmp_seq=1 ttl=64 time=0.277 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.277/0.277/0.277/0.000 ms
Step 5: Ping IP address 1.0.0.1 from DUT0:
admin@DUT0$ ping 1.0.0.1 count 1 size 56 timeout 1Show output
PING 1.0.0.1 (1.0.0.1) 56(84) bytes of data. 64 bytes from 1.0.0.1: icmp_seq=1 ttl=64 time=0.330 ms --- 1.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.330/0.330/0.330/0.000 ms
Step 6: Run command interfaces ethernet show at DUT2 and check if output contains the following tokens:
20.0.0.50Show output
--------------------------------------------------------------------- Name IP Address Admin Oper Vrf Description --------------------------------------------------------------------- eth0 fe80::dcad:beff:feef:6c20/64 up up eth0.200 20.0.0.50/24 up up fe80::dcad:beff:feef:6c20/64 eth1 down down
Test DHCP Relay With Multiple Instances
Description
This example demonstrates how to configure multiple DHCP relay instances.
Scenario
Step 1: Set the following configuration in DUT0 :
set interfaces ethernet eth0 vif 100 address 10.0.0.2/24 set interfaces ethernet eth1 vif 200 address 20.0.0.2/24 set interfaces ethernet eth1 vif 300 address 30.0.0.2/24 set service dhcp-relay INS downstream-interface eth1.200 set service dhcp-relay INS server 10.0.0.1 set service dhcp-relay INS upstream-interface eth0.100 set service dhcp-relay INS2 downstream-interface eth1.300 set service dhcp-relay INS2 server 10.0.0.1 set service dhcp-relay INS2 upstream-interface eth0.100 set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 2: Set the following configuration in DUT1 :
set interfaces ethernet eth0 vif 100 address 10.0.0.1/24 set protocols static route 0.0.0.0/0 next-hop 10.0.0.2 set service dhcp-server shared-network dummy subnet 10.0.0.1/32 set service dhcp-server shared-network remote subnet 20.0.0.0/24 start 20.0.0.50 stop 20.0.0.50 set service dhcp-server shared-network remote2 subnet 30.0.0.0/24 start 30.0.0.50 stop 30.0.0.50 set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 3: Set the following configuration in DUT2 :
set interfaces ethernet eth0 vif 200 address dhcp set interfaces ethernet eth0 vif 300 address dhcp set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 4: Ping IP address 10.0.0.1 from DUT0:
admin@DUT0$ ping 10.0.0.1 count 1 size 56 timeout 1Show output
PING 10.0.0.1 (10.0.0.1) 56(84) bytes of data. 64 bytes from 10.0.0.1: icmp_seq=1 ttl=64 time=0.235 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.235/0.235/0.235/0.000 ms
Step 5: Run command interfaces ethernet show at DUT2 and check if output contains the following tokens:
20.0.0.50Show output
--------------------------------------------------------------------- Name IP Address Admin Oper Vrf Description --------------------------------------------------------------------- eth0 fe80::dcad:beff:feef:6c20/64 up up eth0.200 20.0.0.50/24 up up fe80::dcad:beff:feef:6c20/64 eth0.300 30.0.0.50/24 up up fe80::dcad:beff:feef:6c20/64 eth1 down down
Step 6: Run command interfaces ethernet show at DUT2 and check if output contains the following tokens:
30.0.0.50Show output
--------------------------------------------------------------------- Name IP Address Admin Oper Vrf Description --------------------------------------------------------------------- eth0 fe80::dcad:beff:feef:6c20/64 up up eth0.200 20.0.0.50/24 up up fe80::dcad:beff:feef:6c20/64 eth0.300 30.0.0.50/24 up up fe80::dcad:beff:feef:6c20/64 eth1 down down
Step 7: Run command system journal show | cat at DUT1 and check if output matches the following regular expressions:
DHCPACK on 20.0.0.50 to [^\)]+\) via 20.0.0.2 DHCPACK on 30.0.0.50 to [^\)]+\) via 30.0.0.2Show output
Jun 20 15:33:31.345126 osdx systemd-journald[1554]: Runtime Journal (/run/log/journal/6007ddf378ad466885280cbf52ccf316) is 1.0M, max 7.2M, 6.2M free. Jun 20 15:33:31.346112 osdx systemd-journald[1554]: Received client request to rotate journal, rotating. Jun 20 15:33:31.346158 osdx systemd-journald[1554]: Vacuuming done, freed 0B of archived journals from /run/log/journal/6007ddf378ad466885280cbf52ccf316. Jun 20 15:33:31.354851 osdx OSDxCLI[170436]: User 'admin' executed a new command: 'system journal clear'. Jun 20 15:33:31.552482 osdx OSDxCLI[170436]: User 'admin' executed a new command: 'system coredump delete all'. Jun 20 15:33:33.264704 osdx OSDxCLI[170436]: User 'admin' entered the configuration menu. Jun 20 15:33:33.349680 osdx OSDxCLI[170436]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Jun 20 15:33:33.481630 osdx OSDxCLI[170436]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Jun 20 15:33:33.605611 osdx OSDxCLI[170436]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network remote subnet 20.0.0.0/24 start 20.0.0.50 stop 20.0.0.50'. Jun 20 15:33:33.724564 osdx OSDxCLI[170436]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Jun 20 15:33:33.867354 osdx OSDxCLI[170436]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network remote2 subnet 30.0.0.0/24 start 30.0.0.50 stop 30.0.0.50'. Jun 20 15:33:34.009253 osdx OSDxCLI[170436]: User 'admin' added a new cfg line: 'show working'. Jun 20 15:33:34.127497 osdx ubnt-cfgd[234904]: inactive Jun 20 15:33:34.163466 osdx INFO[234916]: FRR daemons did not change Jun 20 15:33:34.189914 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Jun 20 15:33:34.213631 osdx (udev-worker)[234963]: Network interface NamePolicy= disabled on kernel command line. Jun 20 15:33:34.350183 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Jun 20 15:33:34.351820 osdx cfgd[1254]: [170436]Completed change to active configuration Jun 20 15:33:34.354161 osdx dhcpd[235033]: Wrote 0 leases to leases file. Jun 20 15:33:34.365230 osdx OSDxCLI[170436]: User 'admin' committed the configuration. Jun 20 15:33:34.406730 osdx OSDxCLI[170436]: User 'admin' left the configuration menu. Jun 20 15:33:34.433437 osdx dhcpd[235033]: Jun 20 15:33:34.433446 osdx dhcpd[235033]: No subnet declaration for eth0 (no IPv4 addresses). Jun 20 15:33:34.433449 osdx dhcpd[235033]: ** Ignoring requests on eth0. If this is not what Jun 20 15:33:34.433452 osdx dhcpd[235033]: you want, please write a subnet declaration Jun 20 15:33:34.433456 osdx dhcpd[235033]: in your dhcpd.conf file for the network segment Jun 20 15:33:34.433459 osdx dhcpd[235033]: to which interface eth0 is attached. ** Jun 20 15:33:34.433462 osdx dhcpd[235033]: Jun 20 15:33:34.450086 osdx dhcpd[235033]: Server starting service. Jun 20 15:33:35.241456 osdx dhcpd[235033]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 Jun 20 15:33:35.389319 osdx dhcpd[235033]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 30.0.0.2 Jun 20 15:33:36.241983 osdx dhcpd[235033]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Jun 20 15:33:36.242707 osdx dhcpd[235033]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Jun 20 15:33:36.255578 osdx dhcpd[235033]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Jun 20 15:33:36.389564 osdx dhcpd[235033]: DHCPOFFER on 30.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 30.0.0.2 Jun 20 15:33:36.390266 osdx dhcpd[235033]: DHCPREQUEST for 30.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 30.0.0.2 Jun 20 15:33:36.409935 osdx dhcpd[235033]: DHCPACK on 30.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 30.0.0.2