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=0.193 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.193/0.193/0.193/0.000 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=0.178 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.178/0.178/0.178/0.000 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
Apr 06 15:48:14.287424 osdx systemd-journald[1758]: Runtime Journal (/run/log/journal/862cb27bfeac4475836e13336dc829f0) is 920.0K, max 6.5M, 5.6M free. Apr 06 15:48:14.288029 osdx systemd-journald[1758]: Received client request to rotate journal, rotating. Apr 06 15:48:14.288075 osdx systemd-journald[1758]: Vacuuming done, freed 0B of archived journals from /run/log/journal/862cb27bfeac4475836e13336dc829f0. Apr 06 15:48:14.296732 osdx OSDxCLI[2067]: User 'admin' executed a new command: 'system journal clear'. Apr 06 15:48:14.478327 osdx OSDxCLI[2067]: User 'admin' executed a new command: 'system coredump delete all'. Apr 06 15:48:15.935404 osdx OSDxCLI[2067]: User 'admin' entered the configuration menu. Apr 06 15:48:16.005606 osdx OSDxCLI[2067]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Apr 06 15:48:16.088649 osdx OSDxCLI[2067]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Apr 06 15:48:16.155891 osdx OSDxCLI[2067]: 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'. Apr 06 15:48:16.265996 osdx OSDxCLI[2067]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Apr 06 15:48:16.329079 osdx OSDxCLI[2067]: User 'admin' added a new cfg line: 'show working'. Apr 06 15:48:16.417332 osdx ubnt-cfgd[96326]: inactive Apr 06 15:48:16.441655 osdx INFO[96336]: FRR daemons did not change Apr 06 15:48:16.472033 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Apr 06 15:48:16.487827 osdx (udev-worker)[96384]: Network interface NamePolicy= disabled on kernel command line. Apr 06 15:48:16.624432 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Apr 06 15:48:16.626747 osdx cfgd[1457]: [2067]Completed change to active configuration Apr 06 15:48:16.628518 osdx dhcpd[96457]: Wrote 0 leases to leases file. Apr 06 15:48:16.639022 osdx OSDxCLI[2067]: User 'admin' committed the configuration. Apr 06 15:48:16.649491 osdx dhcpd[96457]: Apr 06 15:48:16.649498 osdx dhcpd[96457]: No subnet declaration for eth0 (no IPv4 addresses). Apr 06 15:48:16.649501 osdx dhcpd[96457]: ** Ignoring requests on eth0. If this is not what Apr 06 15:48:16.649507 osdx dhcpd[96457]: you want, please write a subnet declaration Apr 06 15:48:16.649510 osdx dhcpd[96457]: in your dhcpd.conf file for the network segment Apr 06 15:48:16.649512 osdx dhcpd[96457]: to which interface eth0 is attached. ** Apr 06 15:48:16.649514 osdx dhcpd[96457]: Apr 06 15:48:16.653857 osdx OSDxCLI[2067]: User 'admin' left the configuration menu. Apr 06 15:48:16.668178 osdx dhcpd[96457]: Server starting service. Apr 06 15:48:17.198219 osdx dhcpd[96457]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.3 Apr 06 15:48:18.198557 osdx dhcpd[96457]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.3 Apr 06 15:48:18.199118 osdx dhcpd[96457]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.3 Apr 06 15:48:18.218185 osdx dhcpd[96457]: 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=0.239 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.239/0.239/0.239/0.000 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=0.247 ms --- 1.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.247/0.247/0.247/0.000 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=0.196 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.196/0.196/0.196/0.000 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
Apr 06 15:48:37.305734 osdx systemd-journald[1758]: Runtime Journal (/run/log/journal/862cb27bfeac4475836e13336dc829f0) is 932.0K, max 6.5M, 5.6M free. Apr 06 15:48:37.309280 osdx systemd-journald[1758]: Received client request to rotate journal, rotating. Apr 06 15:48:37.309347 osdx systemd-journald[1758]: Vacuuming done, freed 0B of archived journals from /run/log/journal/862cb27bfeac4475836e13336dc829f0. Apr 06 15:48:37.315465 osdx OSDxCLI[2067]: User 'admin' executed a new command: 'system journal clear'. Apr 06 15:48:37.506868 osdx OSDxCLI[2067]: User 'admin' executed a new command: 'system coredump delete all'. Apr 06 15:48:39.019689 osdx OSDxCLI[2067]: User 'admin' entered the configuration menu. Apr 06 15:48:39.106292 osdx OSDxCLI[2067]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Apr 06 15:48:39.193578 osdx OSDxCLI[2067]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Apr 06 15:48:39.257022 osdx OSDxCLI[2067]: 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'. Apr 06 15:48:39.370995 osdx OSDxCLI[2067]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Apr 06 15:48:39.513261 osdx OSDxCLI[2067]: 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'. Apr 06 15:48:39.637281 osdx OSDxCLI[2067]: User 'admin' added a new cfg line: 'show working'. Apr 06 15:48:39.764561 osdx ubnt-cfgd[97293]: inactive Apr 06 15:48:39.797026 osdx INFO[97305]: FRR daemons did not change Apr 06 15:48:39.817253 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Apr 06 15:48:39.841365 osdx (udev-worker)[97352]: Network interface NamePolicy= disabled on kernel command line. Apr 06 15:48:39.965807 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Apr 06 15:48:39.968547 osdx cfgd[1457]: [2067]Completed change to active configuration Apr 06 15:48:39.971324 osdx dhcpd[97426]: Wrote 0 leases to leases file. Apr 06 15:48:39.980974 osdx OSDxCLI[2067]: User 'admin' committed the configuration. Apr 06 15:48:39.993157 osdx dhcpd[97426]: Apr 06 15:48:39.993165 osdx dhcpd[97426]: No subnet declaration for eth0 (no IPv4 addresses). Apr 06 15:48:39.993167 osdx dhcpd[97426]: ** Ignoring requests on eth0. If this is not what Apr 06 15:48:39.993170 osdx dhcpd[97426]: you want, please write a subnet declaration Apr 06 15:48:39.993172 osdx dhcpd[97426]: in your dhcpd.conf file for the network segment Apr 06 15:48:39.993175 osdx dhcpd[97426]: to which interface eth0 is attached. ** Apr 06 15:48:39.993177 osdx dhcpd[97426]: Apr 06 15:48:40.001380 osdx dhcpd[97426]: Server starting service. Apr 06 15:48:40.005467 osdx OSDxCLI[2067]: User 'admin' left the configuration menu. Apr 06 15:48:40.647378 osdx dhcpd[97426]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 Apr 06 15:48:40.815202 osdx dhcpd[97426]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 30.0.0.2 Apr 06 15:48:41.647776 osdx dhcpd[97426]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Apr 06 15:48:41.648397 osdx dhcpd[97426]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Apr 06 15:48:41.662691 osdx dhcpd[97426]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Apr 06 15:48:41.815455 osdx dhcpd[97426]: DHCPOFFER on 30.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 30.0.0.2 Apr 06 15:48:41.816021 osdx dhcpd[97426]: DHCPREQUEST for 30.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 30.0.0.2 Apr 06 15:48:41.827215 osdx dhcpd[97426]: DHCPACK on 30.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 30.0.0.2