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=0.224 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.224/0.224/0.224/0.000 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=0.282 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.282/0.282/0.282/0.000 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
May 13 17:08:12.271536 osdx systemd-journald[1556]: Runtime Journal (/run/log/journal/40d471a1719548efa28850ccdbbdff9f) is 1.0M, max 7.2M, 6.2M free. May 13 17:08:12.273491 osdx systemd-journald[1556]: Received client request to rotate journal, rotating. May 13 17:08:12.273539 osdx systemd-journald[1556]: Vacuuming done, freed 0B of archived journals from /run/log/journal/40d471a1719548efa28850ccdbbdff9f. May 13 17:08:12.282871 osdx OSDxCLI[163437]: User 'admin' executed a new command: 'system journal clear'. May 13 17:08:12.749349 osdx osdx-coredump[257673]: Deleting all coredumps in /opt/vyatta/etc/config/coredump... May 13 17:08:12.757391 osdx OSDxCLI[163437]: User 'admin' executed a new command: 'system coredump delete all'. May 13 17:08:14.229053 osdx OSDxCLI[163437]: User 'admin' entered the configuration menu. May 13 17:08:14.325735 osdx OSDxCLI[163437]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. May 13 17:08:14.423226 osdx OSDxCLI[163437]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. May 13 17:08:14.551461 osdx OSDxCLI[163437]: 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'. May 13 17:08:14.613405 osdx OSDxCLI[163437]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. May 13 17:08:14.726097 osdx OSDxCLI[163437]: User 'admin' added a new cfg line: 'show working'. May 13 17:08:14.818700 osdx ubnt-cfgd[257693]: inactive May 13 17:08:14.844109 osdx INFO[257703]: FRR daemons did not change May 13 17:08:14.865517 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 May 13 17:08:14.893355 osdx (udev-worker)[257750]: Network interface NamePolicy= disabled on kernel command line. May 13 17:08:15.057964 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". May 13 17:08:15.063026 osdx cfgd[1253]: [163437]Completed change to active configuration May 13 17:08:15.063421 osdx dhcpd[257820]: Wrote 0 leases to leases file. May 13 17:08:15.075133 osdx OSDxCLI[163437]: User 'admin' committed the configuration. May 13 17:08:15.091705 osdx OSDxCLI[163437]: User 'admin' left the configuration menu. May 13 17:08:15.092349 osdx dhcpd[257820]: May 13 17:08:15.092356 osdx dhcpd[257820]: No subnet declaration for eth0 (no IPv4 addresses). May 13 17:08:15.092359 osdx dhcpd[257820]: ** Ignoring requests on eth0. If this is not what May 13 17:08:15.092361 osdx dhcpd[257820]: you want, please write a subnet declaration May 13 17:08:15.092363 osdx dhcpd[257820]: in your dhcpd.conf file for the network segment May 13 17:08:15.092366 osdx dhcpd[257820]: to which interface eth0 is attached. ** May 13 17:08:15.092368 osdx dhcpd[257820]: May 13 17:08:15.105701 osdx dhcpd[257820]: Server starting service. May 13 17:08:15.686495 osdx dhcpd[257820]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.3 May 13 17:08:16.686811 osdx dhcpd[257820]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.3 May 13 17:08:16.687412 osdx dhcpd[257820]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.3 May 13 17:08:16.697842 osdx dhcpd[257820]: 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=0.221 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.221/0.221/0.221/0.000 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=0.272 ms --- 1.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.272/0.272/0.272/0.000 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=0.245 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.245/0.245/0.245/0.000 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
May 13 17:08:37.306554 osdx systemd-journald[1556]: Runtime Journal (/run/log/journal/40d471a1719548efa28850ccdbbdff9f) is 1.0M, max 7.2M, 6.2M free. May 13 17:08:37.310324 osdx systemd-journald[1556]: Received client request to rotate journal, rotating. May 13 17:08:37.310387 osdx systemd-journald[1556]: Vacuuming done, freed 0B of archived journals from /run/log/journal/40d471a1719548efa28850ccdbbdff9f. May 13 17:08:37.316543 osdx OSDxCLI[163437]: User 'admin' executed a new command: 'system journal clear'. May 13 17:08:37.800003 osdx osdx-coredump[258632]: Deleting all coredumps in /opt/vyatta/etc/config/coredump... May 13 17:08:37.807980 osdx OSDxCLI[163437]: User 'admin' executed a new command: 'system coredump delete all'. May 13 17:08:39.549771 osdx OSDxCLI[163437]: User 'admin' entered the configuration menu. May 13 17:08:39.640438 osdx OSDxCLI[163437]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. May 13 17:08:39.723775 osdx OSDxCLI[163437]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. May 13 17:08:39.790124 osdx OSDxCLI[163437]: 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'. May 13 17:08:39.885019 osdx OSDxCLI[163437]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. May 13 17:08:39.945618 osdx OSDxCLI[163437]: 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'. May 13 17:08:40.058913 osdx OSDxCLI[163437]: User 'admin' added a new cfg line: 'show working'. May 13 17:08:40.120923 osdx ubnt-cfgd[258655]: inactive May 13 17:08:40.150139 osdx INFO[258667]: FRR daemons did not change May 13 17:08:40.170347 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 May 13 17:08:40.191811 osdx (udev-worker)[258714]: Network interface NamePolicy= disabled on kernel command line. May 13 17:08:40.326577 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". May 13 17:08:40.328368 osdx cfgd[1253]: [163437]Completed change to active configuration May 13 17:08:40.330067 osdx dhcpd[258784]: Wrote 0 leases to leases file. May 13 17:08:40.339878 osdx OSDxCLI[163437]: User 'admin' committed the configuration. May 13 17:08:40.355602 osdx OSDxCLI[163437]: User 'admin' left the configuration menu. May 13 17:08:40.358224 osdx dhcpd[258784]: May 13 17:08:40.358228 osdx dhcpd[258784]: No subnet declaration for eth0 (no IPv4 addresses). May 13 17:08:40.358231 osdx dhcpd[258784]: ** Ignoring requests on eth0. If this is not what May 13 17:08:40.358233 osdx dhcpd[258784]: you want, please write a subnet declaration May 13 17:08:40.358235 osdx dhcpd[258784]: in your dhcpd.conf file for the network segment May 13 17:08:40.358237 osdx dhcpd[258784]: to which interface eth0 is attached. ** May 13 17:08:40.358239 osdx dhcpd[258784]: May 13 17:08:40.370593 osdx dhcpd[258784]: Server starting service. May 13 17:08:41.031364 osdx dhcpd[258784]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 May 13 17:08:41.179188 osdx dhcpd[258784]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 30.0.0.2 May 13 17:08:42.031635 osdx dhcpd[258784]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 May 13 17:08:42.032206 osdx dhcpd[258784]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 May 13 17:08:42.055044 osdx dhcpd[258784]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 May 13 17:08:42.179429 osdx dhcpd[258784]: DHCPOFFER on 30.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 30.0.0.2 May 13 17:08:42.179997 osdx dhcpd[258784]: DHCPREQUEST for 30.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 30.0.0.2 May 13 17:08:42.209399 osdx dhcpd[258784]: DHCPACK on 30.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 30.0.0.2