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=0.243 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.243/0.243/0.243/0.000 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=0.237 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.237/0.237/0.237/0.000 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
Oct 10 22:59:42.364455 osdx systemd-journald[1561]: Runtime Journal (/run/log/journal/806ba4d037ed4b398e58eb92edf93777) is 964.0K, max 6.5M, 5.5M free. Oct 10 22:59:42.365142 osdx systemd-journald[1561]: Received client request to rotate journal, rotating. Oct 10 22:59:42.365194 osdx systemd-journald[1561]: Vacuuming done, freed 0B of archived journals from /run/log/journal/806ba4d037ed4b398e58eb92edf93777. Oct 10 22:59:42.377346 osdx OSDxCLI[129632]: User 'admin' executed a new command: 'system journal clear'. Oct 10 22:59:42.600630 osdx OSDxCLI[129632]: User 'admin' executed a new command: 'system coredump delete all'. Oct 10 22:59:43.943412 osdx OSDxCLI[129632]: User 'admin' entered the configuration menu. Oct 10 22:59:44.015809 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Oct 10 22:59:44.096071 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Oct 10 22:59:44.151765 osdx OSDxCLI[129632]: 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'. Oct 10 22:59:44.242085 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Oct 10 22:59:44.307515 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'show working'. Oct 10 22:59:44.413391 osdx ubnt-cfgd[314509]: inactive Oct 10 22:59:44.438809 osdx INFO[314519]: FRR daemons did not change Oct 10 22:59:44.465180 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Oct 10 22:59:44.482502 osdx (udev-worker)[314567]: Network interface NamePolicy= disabled on kernel command line. Oct 10 22:59:44.669702 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Oct 10 22:59:44.671760 osdx dhcpd[314640]: Wrote 0 leases to leases file. Oct 10 22:59:44.672289 osdx cfgd[1260]: [129632]Completed change to active configuration Oct 10 22:59:44.683553 osdx OSDxCLI[129632]: User 'admin' committed the configuration. Oct 10 22:59:44.698264 osdx OSDxCLI[129632]: User 'admin' left the configuration menu. Oct 10 22:59:44.700032 osdx dhcpd[314640]: Oct 10 22:59:44.700040 osdx dhcpd[314640]: No subnet declaration for eth0 (no IPv4 addresses). Oct 10 22:59:44.700043 osdx dhcpd[314640]: ** Ignoring requests on eth0. If this is not what Oct 10 22:59:44.700046 osdx dhcpd[314640]: you want, please write a subnet declaration Oct 10 22:59:44.700049 osdx dhcpd[314640]: in your dhcpd.conf file for the network segment Oct 10 22:59:44.700052 osdx dhcpd[314640]: to which interface eth0 is attached. ** Oct 10 22:59:44.700055 osdx dhcpd[314640]: Oct 10 22:59:44.713342 osdx dhcpd[314640]: Server starting service. Oct 10 22:59:45.315987 osdx dhcpd[314640]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.3 Oct 10 22:59:46.316333 osdx dhcpd[314640]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.3 Oct 10 22:59:46.316924 osdx dhcpd[314640]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.3 Oct 10 22:59:46.368023 osdx dhcpd[314640]: 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=0.213 ms --- 1.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.213/0.213/0.213/0.000 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=0.186 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.186/0.186/0.186/0.000 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
Oct 10 23:00:05.323984 osdx systemd-journald[1561]: Runtime Journal (/run/log/journal/806ba4d037ed4b398e58eb92edf93777) is 932.0K, max 6.5M, 5.6M free. Oct 10 23:00:05.324322 osdx systemd-journald[1561]: Received client request to rotate journal, rotating. Oct 10 23:00:05.324355 osdx systemd-journald[1561]: Vacuuming done, freed 0B of archived journals from /run/log/journal/806ba4d037ed4b398e58eb92edf93777. Oct 10 23:00:05.333813 osdx OSDxCLI[129632]: User 'admin' executed a new command: 'system journal clear'. Oct 10 23:00:05.540785 osdx OSDxCLI[129632]: User 'admin' executed a new command: 'system coredump delete all'. Oct 10 23:00:07.129448 osdx OSDxCLI[129632]: User 'admin' entered the configuration menu. Oct 10 23:00:07.204249 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Oct 10 23:00:07.276632 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Oct 10 23:00:07.334492 osdx OSDxCLI[129632]: 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'. Oct 10 23:00:07.442480 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Oct 10 23:00:07.503319 osdx OSDxCLI[129632]: 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'. Oct 10 23:00:07.633428 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'show working'. Oct 10 23:00:07.776636 osdx ubnt-cfgd[315466]: inactive Oct 10 23:00:07.804642 osdx INFO[315478]: FRR daemons did not change Oct 10 23:00:07.824292 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Oct 10 23:00:07.846127 osdx (udev-worker)[315527]: Network interface NamePolicy= disabled on kernel command line. Oct 10 23:00:07.993027 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Oct 10 23:00:07.995830 osdx cfgd[1260]: [129632]Completed change to active configuration Oct 10 23:00:07.997225 osdx dhcpd[315599]: Wrote 0 leases to leases file. Oct 10 23:00:08.009114 osdx OSDxCLI[129632]: User 'admin' committed the configuration. Oct 10 23:00:08.033694 osdx dhcpd[315599]: Oct 10 23:00:08.033703 osdx dhcpd[315599]: No subnet declaration for eth0 (no IPv4 addresses). Oct 10 23:00:08.033707 osdx dhcpd[315599]: ** Ignoring requests on eth0. If this is not what Oct 10 23:00:08.033709 osdx dhcpd[315599]: you want, please write a subnet declaration Oct 10 23:00:08.033713 osdx dhcpd[315599]: in your dhcpd.conf file for the network segment Oct 10 23:00:08.033716 osdx dhcpd[315599]: to which interface eth0 is attached. ** Oct 10 23:00:08.033718 osdx dhcpd[315599]: Oct 10 23:00:08.035756 osdx OSDxCLI[129632]: User 'admin' left the configuration menu. Oct 10 23:00:08.048428 osdx dhcpd[315599]: Server starting service. Oct 10 23:00:08.663011 osdx dhcpd[315599]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 Oct 10 23:00:08.791015 osdx dhcpd[315599]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 30.0.0.2 Oct 10 23:00:09.663454 osdx dhcpd[315599]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Oct 10 23:00:09.664251 osdx dhcpd[315599]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Oct 10 23:00:09.696124 osdx dhcpd[315599]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Oct 10 23:00:09.791214 osdx dhcpd[315599]: DHCPOFFER on 30.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 30.0.0.2 Oct 10 23:00:09.791806 osdx dhcpd[315599]: DHCPREQUEST for 30.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 30.0.0.2 Oct 10 23:00:09.833293 osdx dhcpd[315599]: DHCPACK on 30.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 30.0.0.2