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=0.239 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: 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=0.238 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.238/0.238/0.238/0.000 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
Mar 10 12:33:54.266996 osdx systemd-journald[1541]: Runtime Journal (/run/log/journal/37bd014e8df84dd2aee0f9bf8ac2600d) is 1.0M, max 7.2M, 6.2M free. Mar 10 12:33:54.267406 osdx systemd-journald[1541]: Received client request to rotate journal, rotating. Mar 10 12:33:54.267446 osdx systemd-journald[1541]: Vacuuming done, freed 0B of archived journals from /run/log/journal/37bd014e8df84dd2aee0f9bf8ac2600d. Mar 10 12:33:54.276462 osdx OSDxCLI[145235]: User 'admin' executed a new command: 'system journal clear'. Mar 10 12:33:54.705382 osdx osdx-coredump[203602]: Deleting all coredumps in /opt/vyatta/etc/config/coredump... Mar 10 12:33:54.712790 osdx OSDxCLI[145235]: User 'admin' executed a new command: 'system coredump delete all'. Mar 10 12:33:56.235995 osdx OSDxCLI[145235]: User 'admin' entered the configuration menu. Mar 10 12:33:56.307482 osdx OSDxCLI[145235]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Mar 10 12:33:56.396456 osdx OSDxCLI[145235]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Mar 10 12:33:56.451218 osdx OSDxCLI[145235]: 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'. Mar 10 12:33:56.550202 osdx OSDxCLI[145235]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Mar 10 12:33:56.624532 osdx OSDxCLI[145235]: User 'admin' added a new cfg line: 'show working'. Mar 10 12:33:56.718482 osdx INFO[203630]: FRR daemons did not change Mar 10 12:33:56.743434 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Mar 10 12:33:56.774577 osdx (udev-worker)[203682]: Network interface NamePolicy= disabled on kernel command line. Mar 10 12:33:56.899859 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Mar 10 12:33:56.902290 osdx cfgd[1242]: [145235]Completed change to active configuration Mar 10 12:33:56.903326 osdx dhcpd[203703]: Wrote 0 leases to leases file. Mar 10 12:33:56.932117 osdx dhcpd[203703]: Mar 10 12:33:56.932248 osdx dhcpd[203703]: No subnet declaration for eth0 (no IPv4 addresses). Mar 10 12:33:56.932286 osdx dhcpd[203703]: ** Ignoring requests on eth0. If this is not what Mar 10 12:33:56.932321 osdx dhcpd[203703]: you want, please write a subnet declaration Mar 10 12:33:56.932347 osdx dhcpd[203703]: in your dhcpd.conf file for the network segment Mar 10 12:33:56.932375 osdx dhcpd[203703]: to which interface eth0 is attached. ** Mar 10 12:33:56.932400 osdx dhcpd[203703]: Mar 10 12:33:56.937204 osdx OSDxCLI[145235]: User 'admin' committed the configuration. Mar 10 12:33:56.943532 osdx dhcpd[203703]: Server starting service. Mar 10 12:33:56.958008 osdx OSDxCLI[145235]: User 'admin' left the configuration menu. Mar 10 12:33:57.524405 osdx dhcpd[203703]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.3 Mar 10 12:33:58.524520 osdx dhcpd[203703]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.3 Mar 10 12:33:58.525195 osdx dhcpd[203703]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.3 Mar 10 12:33:58.537402 osdx dhcpd[203703]: 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=0.234 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.234/0.234/0.234/0.000 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=0.374 ms --- 1.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.374/0.374/0.374/0.000 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=0.249 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.249/0.249/0.249/0.000 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
Mar 10 12:34:27.298089 osdx systemd-journald[1541]: Runtime Journal (/run/log/journal/37bd014e8df84dd2aee0f9bf8ac2600d) is 1.0M, max 7.2M, 6.2M free. Mar 10 12:34:27.300508 osdx systemd-journald[1541]: Received client request to rotate journal, rotating. Mar 10 12:34:27.300590 osdx systemd-journald[1541]: Vacuuming done, freed 0B of archived journals from /run/log/journal/37bd014e8df84dd2aee0f9bf8ac2600d. Mar 10 12:34:27.308332 osdx OSDxCLI[145235]: User 'admin' executed a new command: 'system journal clear'. Mar 10 12:34:27.792309 osdx osdx-coredump[204300]: Deleting all coredumps in /opt/vyatta/etc/config/coredump... Mar 10 12:34:27.799891 osdx OSDxCLI[145235]: User 'admin' executed a new command: 'system coredump delete all'. Mar 10 12:34:29.563138 osdx OSDxCLI[145235]: User 'admin' entered the configuration menu. Mar 10 12:34:29.676158 osdx OSDxCLI[145235]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Mar 10 12:34:29.734807 osdx OSDxCLI[145235]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Mar 10 12:34:29.833187 osdx OSDxCLI[145235]: 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'. Mar 10 12:34:29.903583 osdx OSDxCLI[145235]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Mar 10 12:34:29.985302 osdx OSDxCLI[145235]: 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'. Mar 10 12:34:30.096608 osdx OSDxCLI[145235]: User 'admin' added a new cfg line: 'show working'. Mar 10 12:34:30.185798 osdx INFO[204331]: FRR daemons did not change Mar 10 12:34:30.208498 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Mar 10 12:34:30.236591 osdx (udev-worker)[204383]: Network interface NamePolicy= disabled on kernel command line. Mar 10 12:34:30.384788 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Mar 10 12:34:30.387407 osdx cfgd[1242]: [145235]Completed change to active configuration Mar 10 12:34:30.389494 osdx dhcpd[204404]: Wrote 0 leases to leases file. Mar 10 12:34:30.416342 osdx dhcpd[204404]: Mar 10 12:34:30.416493 osdx dhcpd[204404]: No subnet declaration for eth0 (no IPv4 addresses). Mar 10 12:34:30.416538 osdx dhcpd[204404]: ** Ignoring requests on eth0. If this is not what Mar 10 12:34:30.416570 osdx dhcpd[204404]: you want, please write a subnet declaration Mar 10 12:34:30.416605 osdx dhcpd[204404]: in your dhcpd.conf file for the network segment Mar 10 12:34:30.416638 osdx dhcpd[204404]: to which interface eth0 is attached. ** Mar 10 12:34:30.416666 osdx dhcpd[204404]: Mar 10 12:34:30.419651 osdx OSDxCLI[145235]: User 'admin' committed the configuration. Mar 10 12:34:30.440637 osdx dhcpd[204404]: Server starting service. Mar 10 12:34:30.446112 osdx OSDxCLI[145235]: User 'admin' left the configuration menu. Mar 10 12:34:31.109444 osdx dhcpd[204404]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 Mar 10 12:34:31.285223 osdx dhcpd[204404]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 30.0.0.2 Mar 10 12:34:32.109582 osdx dhcpd[204404]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Mar 10 12:34:32.110191 osdx dhcpd[204404]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Mar 10 12:34:32.124425 osdx dhcpd[204404]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Mar 10 12:34:32.285483 osdx dhcpd[204404]: DHCPOFFER on 30.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 30.0.0.2 Mar 10 12:34:32.286127 osdx dhcpd[204404]: DHCPREQUEST for 30.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 30.0.0.2 Mar 10 12:34:32.301703 osdx dhcpd[204404]: DHCPACK on 30.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 30.0.0.2