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=0.241 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.241/0.241/0.241/0.000 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
Nov 25 09:37:59.281102 osdx systemd-journald[1748]: Runtime Journal (/run/log/journal/c23349e7d2664277b4fe16aa8bcc979f) is 908.0K, max 6.5M, 5.6M free. Nov 25 09:37:59.281567 osdx systemd-journald[1748]: Received client request to rotate journal, rotating. Nov 25 09:37:59.281611 osdx systemd-journald[1748]: Vacuuming done, freed 0B of archived journals from /run/log/journal/c23349e7d2664277b4fe16aa8bcc979f. Nov 25 09:37:59.293834 osdx OSDxCLI[2045]: User 'admin' executed a new command: 'system journal clear'. Nov 25 09:37:59.494655 osdx OSDxCLI[2045]: User 'admin' executed a new command: 'system coredump delete all'. Nov 25 09:38:00.873692 osdx OSDxCLI[2045]: User 'admin' entered the configuration menu. Nov 25 09:38:00.969393 osdx OSDxCLI[2045]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Nov 25 09:38:01.052784 osdx OSDxCLI[2045]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Nov 25 09:38:01.114290 osdx OSDxCLI[2045]: 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'. Nov 25 09:38:01.209393 osdx OSDxCLI[2045]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Nov 25 09:38:01.279502 osdx OSDxCLI[2045]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 log prefix DHCP_'. Nov 25 09:38:01.369440 osdx OSDxCLI[2045]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 selector UDP'. Nov 25 09:38:01.431659 osdx OSDxCLI[2045]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 protocol udp'. Nov 25 09:38:01.544299 osdx OSDxCLI[2045]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 destination port 67'. Nov 25 09:38:01.608143 osdx OSDxCLI[2045]: User 'admin' added a new cfg line: 'set interfaces eth0.100 traffic policy in LOGGER'. Nov 25 09:38:01.752875 osdx OSDxCLI[2045]: User 'admin' added a new cfg line: 'show working'. Nov 25 09:38:01.825857 osdx ubnt-cfgd[9400]: inactive Nov 25 09:38:01.906056 osdx INFO[9425]: FRR daemons did not change Nov 25 09:38:01.929143 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Nov 25 09:38:01.953204 osdx (udev-worker)[9474]: Network interface NamePolicy= disabled on kernel command line. Nov 25 09:38:02.441527 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Nov 25 09:38:02.443478 osdx cfgd[1449]: [2045]Completed change to active configuration Nov 25 09:38:02.445284 osdx dhcpd[9575]: Wrote 0 leases to leases file. Nov 25 09:38:02.455132 osdx OSDxCLI[2045]: User 'admin' committed the configuration. Nov 25 09:38:02.462959 osdx dhcpd[9575]: Nov 25 09:38:02.462966 osdx dhcpd[9575]: No subnet declaration for eth0 (no IPv4 addresses). Nov 25 09:38:02.462970 osdx dhcpd[9575]: ** Ignoring requests on eth0. If this is not what Nov 25 09:38:02.462973 osdx dhcpd[9575]: you want, please write a subnet declaration Nov 25 09:38:02.462976 osdx dhcpd[9575]: in your dhcpd.conf file for the network segment Nov 25 09:38:02.462979 osdx dhcpd[9575]: to which interface eth0 is attached. ** Nov 25 09:38:02.462982 osdx dhcpd[9575]: Nov 25 09:38:02.473012 osdx OSDxCLI[2045]: User 'admin' left the configuration menu. Nov 25 09:38:02.477256 osdx dhcpd[9575]: Server starting service. Nov 25 09:38:03.084162 osdx dhcpd[9575]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 Nov 25 09:38:03.085139 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=57136 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Nov 25 09:38:04.084304 osdx dhcpd[9575]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Nov 25 09:38:04.085165 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=57188 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Nov 25 09:38:04.084985 osdx dhcpd[9575]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Nov 25 09:38:04.127402 osdx dhcpd[9575]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2