Local-Address
This scenario shows how to configure a DHCP relay agent to
forward DHCP requests. By default, the local-address option uses
a custom local IP as source address for upstream traffic.
Test DHCP Relay With Local-Address
Description
This example shows how to configure the
local-address option. This command can be used
to set the source address for upstream traffic.
Scenario
Step 1: Set the following configuration in DUT0 :
set interfaces dummy dum0 address 1.1.1.1/32 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 local-address 1.1.1.1 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 interfaces ethernet eth0 vif 100 traffic policy in LOGGER 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' set traffic policy LOGGER rule 1 log prefix DHCP_ set traffic policy LOGGER rule 1 selector UDP set traffic selector UDP rule 1 destination port 67 set traffic selector UDP rule 1 protocol udp
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=0.371 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.371/0.371/0.371/0.000 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 eth2 down down eth3 down down
Step 6: Run command system journal show | cat at DUT1 and check if output matches the following regular expressions:
SRC=1.1.1.1 DST=10.0.0.1Show output
Mar 05 22:24:24.306693 osdx systemd-journald[1982]: Runtime Journal (/run/log/journal/870944ec2cb343ee825d9d66ec6747cc) is 928.0K, max 6.4M, 5.5M free. Mar 05 22:24:24.307296 osdx systemd-journald[1982]: Received client request to rotate journal, rotating. Mar 05 22:24:24.307336 osdx systemd-journald[1982]: Vacuuming done, freed 0B of archived journals from /run/log/journal/870944ec2cb343ee825d9d66ec6747cc. Mar 05 22:24:24.316960 osdx OSDxCLI[632527]: User 'admin' executed a new command: 'system journal clear'. Mar 05 22:24:24.517504 osdx OSDxCLI[632527]: User 'admin' executed a new command: 'system coredump delete all'. Mar 05 22:24:25.912510 osdx OSDxCLI[632527]: User 'admin' entered the configuration menu. Mar 05 22:24:26.008751 osdx OSDxCLI[632527]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Mar 05 22:24:26.097356 osdx OSDxCLI[632527]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Mar 05 22:24:26.197925 osdx OSDxCLI[632527]: 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 05 22:24:26.259142 osdx OSDxCLI[632527]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Mar 05 22:24:26.376323 osdx OSDxCLI[632527]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 log prefix DHCP_'. Mar 05 22:24:26.442651 osdx OSDxCLI[632527]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 selector UDP'. Mar 05 22:24:26.533497 osdx OSDxCLI[632527]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 protocol udp'. Mar 05 22:24:26.637678 osdx OSDxCLI[632527]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 destination port 67'. Mar 05 22:24:26.727430 osdx OSDxCLI[632527]: User 'admin' added a new cfg line: 'set interfaces eth0.100 traffic policy in LOGGER'. Mar 05 22:24:26.844430 osdx OSDxCLI[632527]: User 'admin' added a new cfg line: 'show working'. Mar 05 22:24:26.908495 osdx ubnt-cfgd[720319]: inactive Mar 05 22:24:26.975194 osdx INFO[720348]: FRR daemons did not change Mar 05 22:24:27.007097 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Mar 05 22:24:27.024610 osdx (udev-worker)[720396]: Network interface NamePolicy= disabled on kernel command line. Mar 05 22:24:27.319433 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Mar 05 22:24:27.320857 osdx cfgd[1620]: [632527]Completed change to active configuration Mar 05 22:24:27.323860 osdx dhcpd[720497]: Wrote 0 leases to leases file. Mar 05 22:24:27.333382 osdx OSDxCLI[632527]: User 'admin' committed the configuration. Mar 05 22:24:27.340699 osdx dhcpd[720497]: Mar 05 22:24:27.340704 osdx dhcpd[720497]: No subnet declaration for eth0 (no IPv4 addresses). Mar 05 22:24:27.340706 osdx dhcpd[720497]: ** Ignoring requests on eth0. If this is not what Mar 05 22:24:27.340708 osdx dhcpd[720497]: you want, please write a subnet declaration Mar 05 22:24:27.340710 osdx dhcpd[720497]: in your dhcpd.conf file for the network segment Mar 05 22:24:27.340713 osdx dhcpd[720497]: to which interface eth0 is attached. ** Mar 05 22:24:27.340715 osdx dhcpd[720497]: Mar 05 22:24:27.351992 osdx OSDxCLI[632527]: User 'admin' left the configuration menu. Mar 05 22:24:27.359275 osdx dhcpd[720497]: Server starting service. Mar 05 22:24:28.044698 osdx kernel: [DHCP_-1] ACCEPT IN=eth0.100 OUT= MAC=de:ad:be:ef:6c:10:de:ad:be:ef:6c:00:08:00:45:00:01:48 SRC=1.1.1.1 DST=10.0.0.1 LEN=328 TOS=0x00 PREC=0x00 TTL=64 ID=34325 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Mar 05 22:24:28.044742 osdx dhcpd[720497]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 Mar 05 22:24:29.045284 osdx dhcpd[720497]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Mar 05 22:24:29.046012 osdx kernel: [DHCP_-1] ACCEPT IN=eth0.100 OUT= MAC=de:ad:be:ef:6c:10:de:ad:be:ef:6c:00:08:00:45:00:01:48 SRC=1.1.1.1 DST=10.0.0.1 LEN=328 TOS=0x00 PREC=0x00 TTL=64 ID=34376 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Mar 05 22:24:29.046047 osdx dhcpd[720497]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Mar 05 22:24:29.063204 osdx dhcpd[720497]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2