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=0.258 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.258/0.258/0.258/0.000 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
Mar 20 10:59:09.280687 osdx systemd-journald[1944]: Runtime Journal (/run/log/journal/e123bcf6d5be44acb5b98c152ad7b31f) is 940.0K, max 6.5M, 5.6M free. Mar 20 10:59:09.284463 osdx systemd-journald[1944]: Received client request to rotate journal, rotating. Mar 20 10:59:09.284521 osdx systemd-journald[1944]: Vacuuming done, freed 0B of archived journals from /run/log/journal/e123bcf6d5be44acb5b98c152ad7b31f. Mar 20 10:59:09.290933 osdx OSDxCLI[56616]: User 'admin' executed a new command: 'system journal clear'. Mar 20 10:59:09.479255 osdx OSDxCLI[56616]: User 'admin' executed a new command: 'system coredump delete all'. Mar 20 10:59:10.891214 osdx OSDxCLI[56616]: User 'admin' entered the configuration menu. Mar 20 10:59:10.984298 osdx OSDxCLI[56616]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Mar 20 10:59:11.066626 osdx OSDxCLI[56616]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Mar 20 10:59:11.169774 osdx OSDxCLI[56616]: 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'. Mar 20 10:59:11.246024 osdx OSDxCLI[56616]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Mar 20 10:59:11.334140 osdx OSDxCLI[56616]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 log prefix DHCP_'. Mar 20 10:59:11.391642 osdx OSDxCLI[56616]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 selector UDP'. Mar 20 10:59:11.506694 osdx OSDxCLI[56616]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 protocol udp'. Mar 20 10:59:11.578322 osdx OSDxCLI[56616]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 destination port 67'. Mar 20 10:59:11.698997 osdx OSDxCLI[56616]: User 'admin' added a new cfg line: 'set interfaces eth0.100 traffic policy in LOGGER'. Mar 20 10:59:11.799272 osdx OSDxCLI[56616]: User 'admin' added a new cfg line: 'show working'. Mar 20 10:59:11.868079 osdx ubnt-cfgd[215188]: inactive Mar 20 10:59:11.963964 osdx INFO[215217]: FRR daemons did not change Mar 20 10:59:11.995356 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Mar 20 10:59:12.023672 osdx (udev-worker)[215265]: Network interface NamePolicy= disabled on kernel command line. Mar 20 10:59:12.327866 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Mar 20 10:59:12.330222 osdx cfgd[1619]: [56616]Completed change to active configuration Mar 20 10:59:12.332459 osdx dhcpd[215366]: Wrote 0 leases to leases file. Mar 20 10:59:12.346770 osdx OSDxCLI[56616]: User 'admin' committed the configuration. Mar 20 10:59:12.374730 osdx OSDxCLI[56616]: User 'admin' left the configuration menu. Mar 20 10:59:12.395438 osdx dhcpd[215366]: Mar 20 10:59:12.395447 osdx dhcpd[215366]: No subnet declaration for eth0 (no IPv4 addresses). Mar 20 10:59:12.395450 osdx dhcpd[215366]: ** Ignoring requests on eth0. If this is not what Mar 20 10:59:12.395453 osdx dhcpd[215366]: you want, please write a subnet declaration Mar 20 10:59:12.395456 osdx dhcpd[215366]: in your dhcpd.conf file for the network segment Mar 20 10:59:12.395459 osdx dhcpd[215366]: to which interface eth0 is attached. ** Mar 20 10:59:12.395462 osdx dhcpd[215366]: Mar 20 10:59:12.415513 osdx dhcpd[215366]: Server starting service. Mar 20 10:59:13.069060 osdx dhcpd[215366]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 Mar 20 10:59:13.071334 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=2054 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Mar 20 10:59:14.069962 osdx dhcpd[215366]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Mar 20 10:59:14.070694 osdx dhcpd[215366]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Mar 20 10:59:14.071323 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=2257 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Mar 20 10:59:14.131841 osdx dhcpd[215366]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2