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=0.339 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.339/0.339/0.339/0.000 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=12.8 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 12.843/12.843/12.843/0.000 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 11 23:18:29.519720 osdx systemd-journald[1386]: Runtime Journal (/run/log/journal/2e53bb94cf5347b6b7c2aa8cefa11818) is 1.3M, max 9.7M, 8.3M free. May 11 23:18:29.520795 osdx systemd-journald[1386]: Received client request to rotate journal, rotating. May 11 23:18:29.520870 osdx systemd-journald[1386]: Vacuuming done, freed 0B of archived journals from /run/log/journal/2e53bb94cf5347b6b7c2aa8cefa11818. May 11 23:18:29.539969 osdx OSDxCLI[77508]: User 'admin' executed a new command: 'system journal clear'. May 11 23:18:30.384330 osdx osdx-coredump[135349]: Deleting all coredumps in /opt/vyatta/etc/config/coredump... May 11 23:18:30.401122 osdx OSDxCLI[77508]: User 'admin' executed a new command: 'system coredump delete all'. May 11 23:18:33.577628 osdx OSDxCLI[77508]: User 'admin' entered the configuration menu. May 11 23:18:33.774805 osdx OSDxCLI[77508]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. May 11 23:18:33.936346 osdx OSDxCLI[77508]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. May 11 23:18:34.101193 osdx OSDxCLI[77508]: 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 11 23:18:34.237364 osdx OSDxCLI[77508]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. May 11 23:18:34.395722 osdx OSDxCLI[77508]: User 'admin' added a new cfg line: 'show working'. May 11 23:18:34.632797 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 May 11 23:18:34.677832 osdx (udev-worker)[135421]: Network interface NamePolicy= disabled on kernel command line. May 11 23:18:34.945237 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". May 11 23:18:34.949974 osdx cfgd[1050]: [77508]Completed change to active configuration May 11 23:18:34.951410 osdx dhcpd[135442]: Wrote 0 leases to leases file. May 11 23:18:35.010900 osdx dhcpd[135442]: May 11 23:18:35.011096 osdx dhcpd[135442]: No subnet declaration for eth0 (no IPv4 addresses). May 11 23:18:35.011188 osdx dhcpd[135442]: ** Ignoring requests on eth0. If this is not what May 11 23:18:35.011271 osdx dhcpd[135442]: you want, please write a subnet declaration May 11 23:18:35.011351 osdx dhcpd[135442]: in your dhcpd.conf file for the network segment May 11 23:18:35.011434 osdx dhcpd[135442]: to which interface eth0 is attached. ** May 11 23:18:35.011513 osdx dhcpd[135442]: May 11 23:18:35.033013 osdx dhcpd[135442]: Server starting service. May 11 23:18:35.035764 osdx OSDxCLI[77508]: User 'admin' committed the configuration. May 11 23:18:35.124438 osdx OSDxCLI[77508]: User 'admin' left the configuration menu. May 11 23:18:36.233506 osdx dhcpd[135442]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.3 May 11 23:18:37.234193 osdx dhcpd[135442]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.3 May 11 23:18:37.235502 osdx dhcpd[135442]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.3 May 11 23:18:37.299528 osdx dhcpd[135442]: 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=0.309 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.309/0.309/0.309/0.000 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=0.472 ms --- 1.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.472/0.472/0.472/0.000 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=0.292 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.292/0.292/0.292/0.000 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 11 23:19:09.442031 osdx systemd-journald[1386]: Runtime Journal (/run/log/journal/2e53bb94cf5347b6b7c2aa8cefa11818) is 2.4M, max 9.7M, 7.3M free. May 11 23:19:09.444592 osdx systemd-journald[1386]: Received client request to rotate journal, rotating. May 11 23:19:09.444672 osdx systemd-journald[1386]: Vacuuming done, freed 0B of archived journals from /run/log/journal/2e53bb94cf5347b6b7c2aa8cefa11818. May 11 23:19:09.460431 osdx OSDxCLI[77508]: User 'admin' executed a new command: 'system journal clear'. May 11 23:19:10.190274 osdx osdx-coredump[136018]: Deleting all coredumps in /opt/vyatta/etc/config/coredump... May 11 23:19:10.203568 osdx OSDxCLI[77508]: User 'admin' executed a new command: 'system coredump delete all'. May 11 23:19:13.497600 osdx OSDxCLI[77508]: User 'admin' entered the configuration menu. May 11 23:19:13.658651 osdx OSDxCLI[77508]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. May 11 23:19:13.840301 osdx OSDxCLI[77508]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. May 11 23:19:14.022451 osdx OSDxCLI[77508]: 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 11 23:19:14.160766 osdx OSDxCLI[77508]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. May 11 23:19:14.325494 osdx OSDxCLI[77508]: 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 11 23:19:14.519085 osdx OSDxCLI[77508]: User 'admin' added a new cfg line: 'show working'. May 11 23:19:14.752587 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 May 11 23:19:14.809507 osdx (udev-worker)[136090]: Network interface NamePolicy= disabled on kernel command line. May 11 23:19:15.105332 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". May 11 23:19:15.114945 osdx cfgd[1050]: [77508]Completed change to active configuration May 11 23:19:15.117536 osdx dhcpd[136114]: Wrote 0 leases to leases file. May 11 23:19:15.169244 osdx dhcpd[136114]: May 11 23:19:15.169256 osdx dhcpd[136114]: No subnet declaration for eth0 (no IPv4 addresses). May 11 23:19:15.169261 osdx dhcpd[136114]: ** Ignoring requests on eth0. If this is not what May 11 23:19:15.169266 osdx dhcpd[136114]: you want, please write a subnet declaration May 11 23:19:15.169270 osdx dhcpd[136114]: in your dhcpd.conf file for the network segment May 11 23:19:15.169275 osdx dhcpd[136114]: to which interface eth0 is attached. ** May 11 23:19:15.169279 osdx dhcpd[136114]: May 11 23:19:15.175153 osdx OSDxCLI[77508]: User 'admin' committed the configuration. May 11 23:19:15.188856 osdx dhcpd[136114]: Server starting service. May 11 23:19:15.227638 osdx OSDxCLI[77508]: User 'admin' left the configuration menu. May 11 23:19:16.197194 osdx dhcpd[136114]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 May 11 23:19:16.416955 osdx dhcpd[136114]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 30.0.0.2 May 11 23:19:17.197737 osdx dhcpd[136114]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 May 11 23:19:17.198664 osdx dhcpd[136114]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 May 11 23:19:17.283591 osdx dhcpd[136114]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 May 11 23:19:17.417250 osdx dhcpd[136114]: DHCPOFFER on 30.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 30.0.0.2 May 11 23:19:17.418298 osdx dhcpd[136114]: DHCPREQUEST for 30.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 30.0.0.2 May 11 23:19:17.491853 osdx dhcpd[136114]: DHCPACK on 30.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 30.0.0.2