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=0.182 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.182/0.182/0.182/0.000 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:
SRC=1.1.1.1 DST=10.0.0.1Show output
Oct 10 23:00:16.247310 osdx systemd-journald[1561]: Runtime Journal (/run/log/journal/806ba4d037ed4b398e58eb92edf93777) is 964.0K, max 6.5M, 5.5M free. Oct 10 23:00:16.250627 osdx systemd-journald[1561]: Received client request to rotate journal, rotating. Oct 10 23:00:16.250688 osdx systemd-journald[1561]: Vacuuming done, freed 0B of archived journals from /run/log/journal/806ba4d037ed4b398e58eb92edf93777. Oct 10 23:00:16.257566 osdx OSDxCLI[129632]: User 'admin' executed a new command: 'system journal clear'. Oct 10 23:00:16.490994 osdx OSDxCLI[129632]: User 'admin' executed a new command: 'system coredump delete all'. Oct 10 23:00:17.771771 osdx OSDxCLI[129632]: User 'admin' entered the configuration menu. Oct 10 23:00:17.840054 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Oct 10 23:00:17.921205 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Oct 10 23:00:17.978436 osdx OSDxCLI[129632]: 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'. Oct 10 23:00:18.067586 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Oct 10 23:00:18.130331 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 log prefix DHCP_'. Oct 10 23:00:18.226007 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 selector UDP'. Oct 10 23:00:18.283225 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 protocol udp'. Oct 10 23:00:18.379064 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 destination port 67'. Oct 10 23:00:18.436825 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'set interfaces eth0.100 traffic policy in LOGGER'. Oct 10 23:00:18.551679 osdx OSDxCLI[129632]: User 'admin' added a new cfg line: 'show working'. Oct 10 23:00:18.620680 osdx ubnt-cfgd[315818]: inactive Oct 10 23:00:18.691025 osdx INFO[315843]: FRR daemons did not change Oct 10 23:00:18.722634 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Oct 10 23:00:18.745224 osdx (udev-worker)[315891]: Network interface NamePolicy= disabled on kernel command line. Oct 10 23:00:19.018999 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Oct 10 23:00:19.020848 osdx cfgd[1260]: [129632]Completed change to active configuration Oct 10 23:00:19.021981 osdx dhcpd[315986]: Wrote 0 leases to leases file. Oct 10 23:00:19.033680 osdx OSDxCLI[129632]: User 'admin' committed the configuration. Oct 10 23:00:19.053111 osdx OSDxCLI[129632]: User 'admin' left the configuration menu. Oct 10 23:00:19.085135 osdx dhcpd[315986]: Oct 10 23:00:19.085141 osdx dhcpd[315986]: No subnet declaration for eth0 (no IPv4 addresses). Oct 10 23:00:19.085144 osdx dhcpd[315986]: ** Ignoring requests on eth0. If this is not what Oct 10 23:00:19.085146 osdx dhcpd[315986]: you want, please write a subnet declaration Oct 10 23:00:19.085148 osdx dhcpd[315986]: in your dhcpd.conf file for the network segment Oct 10 23:00:19.085150 osdx dhcpd[315986]: to which interface eth0 is attached. ** Oct 10 23:00:19.085153 osdx dhcpd[315986]: Oct 10 23:00:19.098746 osdx dhcpd[315986]: Server starting service. Oct 10 23:00:19.629332 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=44767 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Oct 10 23:00:19.629413 osdx dhcpd[315986]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 Oct 10 23:00:20.629799 osdx dhcpd[315986]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Oct 10 23:00:20.630366 osdx dhcpd[315986]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Oct 10 23:00:20.630636 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=44806 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Oct 10 23:00:20.650766 osdx dhcpd[315986]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2