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=0.242 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.242/0.242/0.242/0.000 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
Jun 02 09:44:48.285714 osdx systemd-journald[1765]: Runtime Journal (/run/log/journal/27bca15c163b4997962c56740a934d39) is 920.0K, max 6.5M, 5.6M free. Jun 02 09:44:48.286066 osdx systemd-journald[1765]: Received client request to rotate journal, rotating. Jun 02 09:44:48.286099 osdx systemd-journald[1765]: Vacuuming done, freed 0B of archived journals from /run/log/journal/27bca15c163b4997962c56740a934d39. Jun 02 09:44:48.296747 osdx OSDxCLI[68402]: User 'admin' executed a new command: 'system journal clear'. Jun 02 09:44:48.571108 osdx OSDxCLI[68402]: User 'admin' executed a new command: 'system coredump delete all'. Jun 02 09:44:50.182872 osdx OSDxCLI[68402]: User 'admin' entered the configuration menu. Jun 02 09:44:50.292640 osdx OSDxCLI[68402]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Jun 02 09:44:50.372370 osdx OSDxCLI[68402]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Jun 02 09:44:50.433336 osdx OSDxCLI[68402]: 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'. Jun 02 09:44:50.534572 osdx OSDxCLI[68402]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Jun 02 09:44:50.594426 osdx OSDxCLI[68402]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 log prefix DHCP_'. Jun 02 09:44:50.708257 osdx OSDxCLI[68402]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 selector UDP'. Jun 02 09:44:50.801009 osdx OSDxCLI[68402]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 protocol udp'. Jun 02 09:44:50.860863 osdx OSDxCLI[68402]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 destination port 67'. Jun 02 09:44:50.991699 osdx OSDxCLI[68402]: User 'admin' added a new cfg line: 'set interfaces eth0.100 traffic policy in LOGGER'. Jun 02 09:44:51.073615 osdx OSDxCLI[68402]: User 'admin' added a new cfg line: 'show working'. Jun 02 09:44:51.143630 osdx ubnt-cfgd[145387]: inactive Jun 02 09:44:51.225074 osdx INFO[145412]: FRR daemons did not change Jun 02 09:44:51.261915 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Jun 02 09:44:51.282908 osdx (udev-worker)[145462]: Network interface NamePolicy= disabled on kernel command line. Jun 02 09:44:51.794491 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Jun 02 09:44:51.797737 osdx cfgd[1460]: [68402]Completed change to active configuration Jun 02 09:44:51.809560 osdx OSDxCLI[68402]: User 'admin' committed the configuration. Jun 02 09:44:51.827866 osdx OSDxCLI[68402]: User 'admin' left the configuration menu. Jun 02 09:44:51.864575 osdx dhcpd[145561]: Wrote 0 leases to leases file. Jun 02 09:44:51.895925 osdx dhcpd[145561]: Jun 02 09:44:51.896027 osdx dhcpd[145561]: No subnet declaration for eth0 (no IPv4 addresses). Jun 02 09:44:51.896058 osdx dhcpd[145561]: ** Ignoring requests on eth0. If this is not what Jun 02 09:44:51.896078 osdx dhcpd[145561]: you want, please write a subnet declaration Jun 02 09:44:51.896104 osdx dhcpd[145561]: in your dhcpd.conf file for the network segment Jun 02 09:44:51.896137 osdx dhcpd[145561]: to which interface eth0 is attached. ** Jun 02 09:44:51.896160 osdx dhcpd[145561]: Jun 02 09:44:51.910135 osdx dhcpd[145561]: Server starting service. Jun 02 09:44:52.606108 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=49777 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Jun 02 09:44:52.606100 osdx dhcpd[145561]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 Jun 02 09:44:53.606747 osdx dhcpd[145561]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Jun 02 09:44:53.607715 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=49974 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Jun 02 09:44:53.607703 osdx dhcpd[145561]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Jun 02 09:44:53.644157 osdx dhcpd[145561]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2