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=2.21 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 2.214/2.214/2.214/0.000 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
Feb 19 16:43:11.609907 osdx systemd-journald[1553]: Runtime Journal (/run/log/journal/4ae5be8e493042ac8988aa43cad7f38b) is 1.0M, max 7.2M, 6.2M free. Feb 19 16:43:11.610815 osdx systemd-journald[1553]: Received client request to rotate journal, rotating. Feb 19 16:43:11.610883 osdx systemd-journald[1553]: Vacuuming done, freed 0B of archived journals from /run/log/journal/4ae5be8e493042ac8988aa43cad7f38b. Feb 19 16:43:11.658514 osdx OSDxCLI[1795]: User 'admin' executed a new command: 'system journal clear'. Feb 19 16:43:12.619976 osdx osdx-coredump[85022]: Deleting all coredumps in /opt/vyatta/etc/config/coredump... Feb 19 16:43:12.637339 osdx OSDxCLI[1795]: User 'admin' executed a new command: 'system coredump delete all'. Feb 19 16:43:15.460264 osdx OSDxCLI[1795]: User 'admin' entered the configuration menu. Feb 19 16:43:15.618615 osdx OSDxCLI[1795]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Feb 19 16:43:15.750152 osdx OSDxCLI[1795]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Feb 19 16:43:15.891328 osdx OSDxCLI[1795]: 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'. Feb 19 16:43:16.034351 osdx OSDxCLI[1795]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Feb 19 16:43:16.176493 osdx OSDxCLI[1795]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 log prefix DHCP_'. Feb 19 16:43:16.309206 osdx OSDxCLI[1795]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 selector UDP'. Feb 19 16:43:16.445811 osdx OSDxCLI[1795]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 protocol udp'. Feb 19 16:43:16.572468 osdx OSDxCLI[1795]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 destination port 67'. Feb 19 16:43:16.732670 osdx OSDxCLI[1795]: User 'admin' added a new cfg line: 'set interfaces eth0.100 traffic policy in LOGGER'. Feb 19 16:43:16.886676 osdx OSDxCLI[1795]: User 'admin' added a new cfg line: 'show working'. Feb 19 16:43:17.133588 osdx INFO[85074]: FRR daemons did not change Feb 19 16:43:17.198818 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Feb 19 16:43:17.295283 osdx (udev-worker)[85123]: Network interface NamePolicy= disabled on kernel command line. Feb 19 16:43:17.747810 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Feb 19 16:43:17.752862 osdx cfgd[1253]: [1795]Completed change to active configuration Feb 19 16:43:17.757213 osdx dhcpd[85167]: Wrote 0 leases to leases file. Feb 19 16:43:17.815632 osdx OSDxCLI[1795]: User 'admin' committed the configuration. Feb 19 16:43:17.821484 osdx dhcpd[85167]: Feb 19 16:43:17.821861 osdx dhcpd[85167]: No subnet declaration for eth0 (no IPv4 addresses). Feb 19 16:43:17.821867 osdx dhcpd[85167]: ** Ignoring requests on eth0. If this is not what Feb 19 16:43:17.821871 osdx dhcpd[85167]: you want, please write a subnet declaration Feb 19 16:43:17.821874 osdx dhcpd[85167]: in your dhcpd.conf file for the network segment Feb 19 16:43:17.821879 osdx dhcpd[85167]: to which interface eth0 is attached. ** Feb 19 16:43:17.821882 osdx dhcpd[85167]: Feb 19 16:43:17.839560 osdx dhcpd[85167]: Server starting service. Feb 19 16:43:17.903487 osdx OSDxCLI[1795]: User 'admin' left the configuration menu. Feb 19 16:43:19.052551 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=49333 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Feb 19 16:43:19.052619 osdx dhcpd[85167]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 Feb 19 16:43:20.053178 osdx dhcpd[85167]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Feb 19 16:43:20.054699 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=49351 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Feb 19 16:43:20.054694 osdx dhcpd[85167]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Feb 19 16:43:20.147755 osdx dhcpd[85167]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2