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=0.294 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.294/0.294/0.294/0.000 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
Dec 11 17:12:47.363474 osdx systemd-journald[1751]: Runtime Journal (/run/log/journal/a9242cd896344ca481d18f29a6e09395) is 940.0K, max 6.5M, 5.6M free. Dec 11 17:12:47.364718 osdx systemd-journald[1751]: Received client request to rotate journal, rotating. Dec 11 17:12:47.364778 osdx systemd-journald[1751]: Vacuuming done, freed 0B of archived journals from /run/log/journal/a9242cd896344ca481d18f29a6e09395. Dec 11 17:12:47.375346 osdx OSDxCLI[220726]: User 'admin' executed a new command: 'system journal clear'. Dec 11 17:12:47.567548 osdx OSDxCLI[220726]: User 'admin' executed a new command: 'system coredump delete all'. Dec 11 17:12:49.104022 osdx OSDxCLI[220726]: User 'admin' entered the configuration menu. Dec 11 17:12:49.222300 osdx OSDxCLI[220726]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Dec 11 17:12:49.304862 osdx OSDxCLI[220726]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Dec 11 17:12:49.452020 osdx OSDxCLI[220726]: 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'. Dec 11 17:12:49.531246 osdx OSDxCLI[220726]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Dec 11 17:12:49.669346 osdx OSDxCLI[220726]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 log prefix DHCP_'. Dec 11 17:12:49.753908 osdx OSDxCLI[220726]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 selector UDP'. Dec 11 17:12:49.875729 osdx OSDxCLI[220726]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 protocol udp'. Dec 11 17:12:49.927466 osdx OSDxCLI[220726]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 destination port 67'. Dec 11 17:12:50.036513 osdx OSDxCLI[220726]: User 'admin' added a new cfg line: 'set interfaces eth0.100 traffic policy in LOGGER'. Dec 11 17:12:50.101286 osdx OSDxCLI[220726]: User 'admin' added a new cfg line: 'show working'. Dec 11 17:12:50.199039 osdx ubnt-cfgd[238037]: inactive Dec 11 17:12:50.293210 osdx INFO[238066]: FRR daemons did not change Dec 11 17:12:50.324708 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Dec 11 17:12:50.342593 osdx (udev-worker)[238116]: Network interface NamePolicy= disabled on kernel command line. Dec 11 17:12:50.629379 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Dec 11 17:12:50.632098 osdx dhcpd[238215]: Wrote 0 leases to leases file. Dec 11 17:12:50.632539 osdx cfgd[1430]: [220726]Completed change to active configuration Dec 11 17:12:50.646670 osdx OSDxCLI[220726]: User 'admin' committed the configuration. Dec 11 17:12:50.665405 osdx dhcpd[238215]: Dec 11 17:12:50.665410 osdx dhcpd[238215]: No subnet declaration for eth0 (no IPv4 addresses). Dec 11 17:12:50.665413 osdx dhcpd[238215]: ** Ignoring requests on eth0. If this is not what Dec 11 17:12:50.665415 osdx dhcpd[238215]: you want, please write a subnet declaration Dec 11 17:12:50.665418 osdx dhcpd[238215]: in your dhcpd.conf file for the network segment Dec 11 17:12:50.665420 osdx dhcpd[238215]: to which interface eth0 is attached. ** Dec 11 17:12:50.665422 osdx dhcpd[238215]: Dec 11 17:12:50.680838 osdx dhcpd[238215]: Server starting service. Dec 11 17:12:50.685641 osdx OSDxCLI[220726]: User 'admin' left the configuration menu. Dec 11 17:12:51.274278 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=55399 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Dec 11 17:12:51.274262 osdx dhcpd[238215]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 Dec 11 17:12:52.275144 osdx dhcpd[238215]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Dec 11 17:12:52.275825 osdx dhcpd[238215]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Dec 11 17:12:52.276708 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=55503 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Dec 11 17:12:52.323380 osdx dhcpd[238215]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2