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=0.333 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.333/0.333/0.333/0.000 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:6c30/64 up up eth0.200 20.0.0.50/24 up up fe80::dcad:beff:feef:6c30/64 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 09 10:11:44.500868 osdx systemd-journald[1556]: Runtime Journal (/run/log/journal/74236e08c7024a4484070d6014d45b65) is 2.4M, max 9.7M, 7.3M free. Oct 09 10:11:44.507878 osdx systemd-journald[1556]: Received client request to rotate journal, rotating. Oct 09 10:11:44.507967 osdx systemd-journald[1556]: Vacuuming done, freed 0B of archived journals from /run/log/journal/74236e08c7024a4484070d6014d45b65. Oct 09 10:11:44.522147 osdx OSDxCLI[9385]: User 'admin' executed a new command: 'system journal clear'. Oct 09 10:11:45.170754 osdx osdx-coredump[155075]: Deleting all coredumps in /opt/vyatta/etc/config/coredump... Oct 09 10:11:45.181459 osdx OSDxCLI[9385]: User 'admin' executed a new command: 'system coredump delete all'. Oct 09 10:11:47.279614 osdx OSDxCLI[9385]: User 'admin' entered the configuration menu. Oct 09 10:11:47.423851 osdx OSDxCLI[9385]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Oct 09 10:11:47.507246 osdx OSDxCLI[9385]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Oct 09 10:11:47.597930 osdx OSDxCLI[9385]: 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 09 10:11:47.692762 osdx OSDxCLI[9385]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Oct 09 10:11:47.784572 osdx OSDxCLI[9385]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 log prefix DHCP_'. Oct 09 10:11:47.872344 osdx OSDxCLI[9385]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 selector UDP'. Oct 09 10:11:47.996124 osdx OSDxCLI[9385]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 protocol udp'. Oct 09 10:11:48.091771 osdx OSDxCLI[9385]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 destination port 67'. Oct 09 10:11:48.191374 osdx OSDxCLI[9385]: User 'admin' added a new cfg line: 'set interfaces eth0.100 traffic policy in LOGGER'. Oct 09 10:11:48.314583 osdx OSDxCLI[9385]: User 'admin' added a new cfg line: 'show working'. Oct 09 10:11:48.559891 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Oct 09 10:11:48.603754 osdx (udev-worker)[155163]: Network interface NamePolicy= disabled on kernel command line. Oct 09 10:11:48.904603 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Oct 09 10:11:48.908967 osdx cfgd[1223]: [9385]Completed change to active configuration Oct 09 10:11:48.916405 osdx dhcpd[155205]: Wrote 0 leases to leases file. Oct 09 10:11:48.956754 osdx OSDxCLI[9385]: User 'admin' committed the configuration. Oct 09 10:11:48.963263 osdx dhcpd[155205]: Oct 09 10:11:48.963269 osdx dhcpd[155205]: No subnet declaration for eth0 (no IPv4 addresses). Oct 09 10:11:48.963272 osdx dhcpd[155205]: ** Ignoring requests on eth0. If this is not what Oct 09 10:11:48.963275 osdx dhcpd[155205]: you want, please write a subnet declaration Oct 09 10:11:48.963278 osdx dhcpd[155205]: in your dhcpd.conf file for the network segment Oct 09 10:11:48.963281 osdx dhcpd[155205]: to which interface eth0 is attached. ** Oct 09 10:11:48.963283 osdx dhcpd[155205]: Oct 09 10:11:48.968010 osdx dhcpd[155205]: Server starting service. Oct 09 10:11:48.997678 osdx OSDxCLI[9385]: User 'admin' left the configuration menu. Oct 09 10:11:49.758798 osdx dhcpd[155205]: DHCPDISCOVER from de:ad:be:ef:6c:30 via 20.0.0.2 Oct 09 10:11:49.759893 osdx kernel: [DHCP_-1] ACCEPT IN=eth0.100 OUT= MAC=de:ad:be:ef:6c:20:de:ad:be:ef:6c:10:08:00:45:00:01:48 SRC=1.1.1.1 DST=10.0.0.1 LEN=328 TOS=0x00 PREC=0x00 TTL=64 ID=11650 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Oct 09 10:11:50.759626 osdx dhcpd[155205]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:30 (osdx) via 20.0.0.2 Oct 09 10:11:50.760463 osdx dhcpd[155205]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:30 (osdx) via 20.0.0.2 Oct 09 10:11:50.763914 osdx kernel: [DHCP_-1] ACCEPT IN=eth0.100 OUT= MAC=de:ad:be:ef:6c:20:de:ad:be:ef:6c:10:08:00:45:00:01:48 SRC=1.1.1.1 DST=10.0.0.1 LEN=328 TOS=0x00 PREC=0x00 TTL=64 ID=11773 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Oct 09 10:11:50.786730 osdx dhcpd[155205]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:30 (osdx) via 20.0.0.2