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=1.22 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 1.221/1.221/1.221/0.000 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=9.80 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 9.799/9.799/9.799/0.000 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
Feb 19 21:22:20.488352 osdx systemd-journald[1550]: Runtime Journal (/run/log/journal/ee06d3e1f21747438cc5b4c977b7f07b) is 1.8M, max 7.2M, 5.4M free. Feb 19 21:22:20.489944 osdx systemd-journald[1550]: Received client request to rotate journal, rotating. Feb 19 21:22:20.490027 osdx systemd-journald[1550]: Vacuuming done, freed 0B of archived journals from /run/log/journal/ee06d3e1f21747438cc5b4c977b7f07b. Feb 19 21:22:20.505563 osdx OSDxCLI[135601]: User 'admin' executed a new command: 'system journal clear'. Feb 19 21:22:21.319326 osdx osdx-coredump[249942]: Deleting all coredumps in /opt/vyatta/etc/config/coredump... Feb 19 21:22:21.332291 osdx OSDxCLI[135601]: User 'admin' executed a new command: 'system coredump delete all'. Feb 19 21:22:24.567320 osdx OSDxCLI[135601]: User 'admin' entered the configuration menu. Feb 19 21:22:24.761920 osdx OSDxCLI[135601]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Feb 19 21:22:24.921924 osdx OSDxCLI[135601]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Feb 19 21:22:25.107018 osdx OSDxCLI[135601]: 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'. Feb 19 21:22:25.251165 osdx OSDxCLI[135601]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Feb 19 21:22:25.439261 osdx OSDxCLI[135601]: User 'admin' added a new cfg line: 'show working'. Feb 19 21:22:25.621615 osdx INFO[249970]: FRR daemons did not change Feb 19 21:22:25.672840 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Feb 19 21:22:25.723163 osdx (udev-worker)[250019]: Network interface NamePolicy= disabled on kernel command line. Feb 19 21:22:25.962956 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Feb 19 21:22:25.967298 osdx dhcpd[250043]: Wrote 0 leases to leases file. Feb 19 21:22:25.967549 osdx cfgd[1251]: [135601]Completed change to active configuration Feb 19 21:22:26.031976 osdx OSDxCLI[135601]: User 'admin' committed the configuration. Feb 19 21:22:26.042910 osdx dhcpd[250043]: Feb 19 21:22:26.043183 osdx dhcpd[250043]: No subnet declaration for eth0 (no IPv4 addresses). Feb 19 21:22:26.043189 osdx dhcpd[250043]: ** Ignoring requests on eth0. If this is not what Feb 19 21:22:26.043193 osdx dhcpd[250043]: you want, please write a subnet declaration Feb 19 21:22:26.043197 osdx dhcpd[250043]: in your dhcpd.conf file for the network segment Feb 19 21:22:26.043201 osdx dhcpd[250043]: to which interface eth0 is attached. ** Feb 19 21:22:26.043205 osdx dhcpd[250043]: Feb 19 21:22:26.058198 osdx dhcpd[250043]: Server starting service. Feb 19 21:22:26.089797 osdx OSDxCLI[135601]: User 'admin' left the configuration menu. Feb 19 21:22:27.265393 osdx dhcpd[250043]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.3 Feb 19 21:22:28.265992 osdx dhcpd[250043]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.3 Feb 19 21:22:28.266907 osdx dhcpd[250043]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.3 Feb 19 21:22:28.315761 osdx dhcpd[250043]: 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=0.770 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.770/0.770/0.770/0.000 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=0.739 ms --- 1.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.739/0.739/0.739/0.000 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=0.474 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.474/0.474/0.474/0.000 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
Feb 19 21:23:08.573879 osdx systemd-journald[1550]: Runtime Journal (/run/log/journal/ee06d3e1f21747438cc5b4c977b7f07b) is 1.0M, max 7.2M, 6.2M free. Feb 19 21:23:08.577796 osdx systemd-journald[1550]: Received client request to rotate journal, rotating. Feb 19 21:23:08.577881 osdx systemd-journald[1550]: Vacuuming done, freed 0B of archived journals from /run/log/journal/ee06d3e1f21747438cc5b4c977b7f07b. Feb 19 21:23:08.593010 osdx OSDxCLI[135601]: User 'admin' executed a new command: 'system journal clear'. Feb 19 21:23:09.368629 osdx osdx-coredump[250640]: Deleting all coredumps in /opt/vyatta/etc/config/coredump... Feb 19 21:23:09.383663 osdx OSDxCLI[135601]: User 'admin' executed a new command: 'system coredump delete all'. Feb 19 21:23:12.280764 osdx OSDxCLI[135601]: User 'admin' entered the configuration menu. Feb 19 21:23:12.422016 osdx OSDxCLI[135601]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Feb 19 21:23:12.541196 osdx OSDxCLI[135601]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Feb 19 21:23:12.698337 osdx OSDxCLI[135601]: 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'. Feb 19 21:23:12.844947 osdx OSDxCLI[135601]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Feb 19 21:23:12.957057 osdx OSDxCLI[135601]: 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'. Feb 19 21:23:13.122864 osdx OSDxCLI[135601]: User 'admin' added a new cfg line: 'show working'. Feb 19 21:23:13.346461 osdx INFO[250671]: FRR daemons did not change Feb 19 21:23:13.381780 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Feb 19 21:23:13.427558 osdx (udev-worker)[250720]: Network interface NamePolicy= disabled on kernel command line. Feb 19 21:23:13.654268 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Feb 19 21:23:13.656509 osdx cfgd[1251]: [135601]Completed change to active configuration Feb 19 21:23:13.667080 osdx dhcpd[250744]: Wrote 0 leases to leases file. Feb 19 21:23:13.706410 osdx OSDxCLI[135601]: User 'admin' committed the configuration. Feb 19 21:23:13.724387 osdx dhcpd[250744]: Feb 19 21:23:13.724401 osdx dhcpd[250744]: No subnet declaration for eth0 (no IPv4 addresses). Feb 19 21:23:13.724408 osdx dhcpd[250744]: ** Ignoring requests on eth0. If this is not what Feb 19 21:23:13.724414 osdx dhcpd[250744]: you want, please write a subnet declaration Feb 19 21:23:13.724419 osdx dhcpd[250744]: in your dhcpd.conf file for the network segment Feb 19 21:23:13.724422 osdx dhcpd[250744]: to which interface eth0 is attached. ** Feb 19 21:23:13.724425 osdx dhcpd[250744]: Feb 19 21:23:13.741914 osdx dhcpd[250744]: Server starting service. Feb 19 21:23:13.755537 osdx OSDxCLI[135601]: User 'admin' left the configuration menu. Feb 19 21:23:14.891443 osdx dhcpd[250744]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 Feb 19 21:23:15.131175 osdx dhcpd[250744]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 30.0.0.2 Feb 19 21:23:15.891867 osdx dhcpd[250744]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Feb 19 21:23:15.892732 osdx dhcpd[250744]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Feb 19 21:23:16.130826 osdx dhcpd[250744]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Feb 19 21:23:16.131315 osdx dhcpd[250744]: DHCPOFFER on 30.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 30.0.0.2 Feb 19 21:23:16.133107 osdx dhcpd[250744]: DHCPREQUEST for 30.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 30.0.0.2 Feb 19 21:23:16.280831 osdx dhcpd[250744]: DHCPACK on 30.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 30.0.0.2