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=0.433 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.433/0.433/0.433/0.000 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
May 04 21:58:56.245086 osdx systemd-journald[1804]: Runtime Journal (/run/log/journal/535ba18673ea4b63ad160634860bb768) is 932.0K, max 6.4M, 5.5M free. May 04 21:58:56.246694 osdx systemd-journald[1804]: Received client request to rotate journal, rotating. May 04 21:58:56.246743 osdx systemd-journald[1804]: Vacuuming done, freed 0B of archived journals from /run/log/journal/535ba18673ea4b63ad160634860bb768. May 04 21:58:56.254115 osdx OSDxCLI[2148]: User 'admin' executed a new command: 'system journal clear'. May 04 21:58:56.431052 osdx OSDxCLI[2148]: User 'admin' executed a new command: 'system coredump delete all'. May 04 21:58:57.809291 osdx OSDxCLI[2148]: User 'admin' entered the configuration menu. May 04 21:58:57.909192 osdx OSDxCLI[2148]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. May 04 21:58:57.978570 osdx OSDxCLI[2148]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. May 04 21:58:58.081637 osdx OSDxCLI[2148]: 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'. May 04 21:58:58.155524 osdx OSDxCLI[2148]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. May 04 21:58:58.250440 osdx OSDxCLI[2148]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 log prefix DHCP_'. May 04 21:58:58.298473 osdx OSDxCLI[2148]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 selector UDP'. May 04 21:58:58.391316 osdx OSDxCLI[2148]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 protocol udp'. May 04 21:58:58.445401 osdx OSDxCLI[2148]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 destination port 67'. May 04 21:58:58.534781 osdx OSDxCLI[2148]: User 'admin' added a new cfg line: 'set interfaces eth0.100 traffic policy in LOGGER'. May 04 21:58:58.599414 osdx OSDxCLI[2148]: User 'admin' added a new cfg line: 'show working'. May 04 21:58:58.691416 osdx ubnt-cfgd[413277]: inactive May 04 21:58:58.754030 osdx INFO[413306]: FRR daemons did not change May 04 21:58:58.782726 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 May 04 21:58:58.800024 osdx WARNING[413346]: No supported link modes on interface eth0 May 04 21:58:58.801635 osdx modulelauncher[413346]: osdx.utils.xos cmd error: /sbin/ethtool -A eth0 autoneg on May 04 21:58:58.801716 osdx modulelauncher[413346]: Command '/sbin/ethtool -A eth0 autoneg on' returned non-zero exit status 76. May 04 21:58:58.803113 osdx modulelauncher[413346]: osdx.utils.xos cmd error: /sbin/ethtool -s eth0 autoneg on advertise Asym_Pause off Pause off -- May 04 21:58:58.803183 osdx modulelauncher[413346]: Command '/sbin/ethtool -s eth0 autoneg on advertise Asym_Pause off Pause off --' returned non-zero exit status 75. May 04 21:58:58.815376 osdx (udev-worker)[413365]: Network interface NamePolicy= disabled on kernel command line. May 04 21:58:59.107261 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". May 04 21:58:59.109646 osdx dhcpd[413470]: Wrote 0 leases to leases file. May 04 21:58:59.112235 osdx cfgd[1440]: [2148]Completed change to active configuration May 04 21:58:59.124135 osdx OSDxCLI[2148]: User 'admin' committed the configuration. May 04 21:58:59.138286 osdx dhcpd[413470]: May 04 21:58:59.138295 osdx dhcpd[413470]: No subnet declaration for eth0 (no IPv4 addresses). May 04 21:58:59.138297 osdx dhcpd[413470]: ** Ignoring requests on eth0. If this is not what May 04 21:58:59.138300 osdx dhcpd[413470]: you want, please write a subnet declaration May 04 21:58:59.138302 osdx dhcpd[413470]: in your dhcpd.conf file for the network segment May 04 21:58:59.138304 osdx dhcpd[413470]: to which interface eth0 is attached. ** May 04 21:58:59.138307 osdx dhcpd[413470]: May 04 21:58:59.151444 osdx dhcpd[413470]: Server starting service. May 04 21:58:59.152018 osdx OSDxCLI[2148]: User 'admin' left the configuration menu. May 04 21:58:59.853633 osdx dhcpd[413470]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 May 04 21:58:59.854690 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=3039 DF PROTO=UDP SPT=67 DPT=67 LEN=308 May 04 21:59:00.854544 osdx dhcpd[413470]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 May 04 21:59:00.855192 osdx dhcpd[413470]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 May 04 21:59:00.858687 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=3137 DF PROTO=UDP SPT=67 DPT=67 LEN=308 May 04 21:59:00.898061 osdx dhcpd[413470]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2