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=0.265 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.265/0.265/0.265/0.000 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
Jan 27 12:22:21.254437 osdx systemd-journald[1740]: Runtime Journal (/run/log/journal/37b75af121414321bf655c1ef6ebb727) is 964.0K, max 6.5M, 5.5M free. Jan 27 12:22:21.257760 osdx systemd-journald[1740]: Received client request to rotate journal, rotating. Jan 27 12:22:21.257821 osdx systemd-journald[1740]: Vacuuming done, freed 0B of archived journals from /run/log/journal/37b75af121414321bf655c1ef6ebb727. Jan 27 12:22:21.264244 osdx OSDxCLI[152046]: User 'admin' executed a new command: 'system journal clear'. Jan 27 12:22:21.486111 osdx OSDxCLI[152046]: User 'admin' executed a new command: 'system coredump delete all'. Jan 27 12:22:22.931909 osdx OSDxCLI[152046]: User 'admin' entered the configuration menu. Jan 27 12:22:23.060450 osdx OSDxCLI[152046]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Jan 27 12:22:23.133951 osdx OSDxCLI[152046]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Jan 27 12:22:23.237947 osdx OSDxCLI[152046]: 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'. Jan 27 12:22:23.292811 osdx OSDxCLI[152046]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Jan 27 12:22:23.415267 osdx OSDxCLI[152046]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 log prefix DHCP_'. Jan 27 12:22:23.533466 osdx OSDxCLI[152046]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 selector UDP'. Jan 27 12:22:23.647030 osdx OSDxCLI[152046]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 protocol udp'. Jan 27 12:22:23.744387 osdx OSDxCLI[152046]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 destination port 67'. Jan 27 12:22:23.840103 osdx OSDxCLI[152046]: User 'admin' added a new cfg line: 'set interfaces eth0.100 traffic policy in LOGGER'. Jan 27 12:22:23.971405 osdx OSDxCLI[152046]: User 'admin' added a new cfg line: 'show working'. Jan 27 12:22:24.037688 osdx ubnt-cfgd[158973]: inactive Jan 27 12:22:24.114650 osdx INFO[159002]: FRR daemons did not change Jan 27 12:22:24.141773 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Jan 27 12:22:24.164517 osdx (udev-worker)[159050]: Network interface NamePolicy= disabled on kernel command line. Jan 27 12:22:24.614199 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Jan 27 12:22:24.616800 osdx cfgd[1417]: [152046]Completed change to active configuration Jan 27 12:22:24.618099 osdx dhcpd[159157]: Wrote 0 leases to leases file. Jan 27 12:22:24.629626 osdx OSDxCLI[152046]: User 'admin' committed the configuration. Jan 27 12:22:24.652862 osdx dhcpd[159157]: Jan 27 12:22:24.652871 osdx dhcpd[159157]: No subnet declaration for eth0 (no IPv4 addresses). Jan 27 12:22:24.652874 osdx dhcpd[159157]: ** Ignoring requests on eth0. If this is not what Jan 27 12:22:24.652878 osdx dhcpd[159157]: you want, please write a subnet declaration Jan 27 12:22:24.652881 osdx dhcpd[159157]: in your dhcpd.conf file for the network segment Jan 27 12:22:24.652884 osdx dhcpd[159157]: to which interface eth0 is attached. ** Jan 27 12:22:24.652887 osdx dhcpd[159157]: Jan 27 12:22:24.656021 osdx OSDxCLI[152046]: User 'admin' left the configuration menu. Jan 27 12:22:24.673933 osdx dhcpd[159157]: Server starting service. Jan 27 12:22:25.411080 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=5259 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Jan 27 12:22:25.411132 osdx dhcpd[159157]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 Jan 27 12:22:26.412047 osdx dhcpd[159157]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Jan 27 12:22:26.412672 osdx dhcpd[159157]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Jan 27 12:22:26.413749 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=5272 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Jan 27 12:22:26.469788 osdx dhcpd[159157]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2