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=0.239 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.239/0.239/0.239/0.000 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
Apr 16 20:48:14.282690 osdx systemd-journald[1990]: Runtime Journal (/run/log/journal/17bae56bc8a84fa2b76db35ef5e507be) is 976.0K, max 6.4M, 5.5M free. Apr 16 20:48:14.284062 osdx systemd-journald[1990]: Received client request to rotate journal, rotating. Apr 16 20:48:14.284123 osdx systemd-journald[1990]: Vacuuming done, freed 0B of archived journals from /run/log/journal/17bae56bc8a84fa2b76db35ef5e507be. Apr 16 20:48:14.295283 osdx OSDxCLI[110216]: User 'admin' executed a new command: 'system journal clear'. Apr 16 20:48:14.531823 osdx OSDxCLI[110216]: User 'admin' executed a new command: 'system coredump delete all'. Apr 16 20:48:16.162245 osdx OSDxCLI[110216]: User 'admin' entered the configuration menu. Apr 16 20:48:16.257644 osdx OSDxCLI[110216]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'. Apr 16 20:48:16.334323 osdx OSDxCLI[110216]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'. Apr 16 20:48:16.451542 osdx OSDxCLI[110216]: 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'. Apr 16 20:48:16.523946 osdx OSDxCLI[110216]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'. Apr 16 20:48:16.631229 osdx OSDxCLI[110216]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 log prefix DHCP_'. Apr 16 20:48:16.685292 osdx OSDxCLI[110216]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 selector UDP'. Apr 16 20:48:16.829671 osdx OSDxCLI[110216]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 protocol udp'. Apr 16 20:48:16.956153 osdx OSDxCLI[110216]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 destination port 67'. Apr 16 20:48:17.071816 osdx OSDxCLI[110216]: User 'admin' added a new cfg line: 'set interfaces eth0.100 traffic policy in LOGGER'. Apr 16 20:48:17.153306 osdx OSDxCLI[110216]: User 'admin' added a new cfg line: 'show working'. Apr 16 20:48:17.288557 osdx ubnt-cfgd[489778]: inactive Apr 16 20:48:17.370690 osdx INFO[489807]: FRR daemons did not change Apr 16 20:48:17.408079 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Apr 16 20:48:17.424858 osdx WARNING[489847]: No supported link modes on interface eth0 Apr 16 20:48:17.426733 osdx modulelauncher[489847]: osdx.utils.xos cmd error: /sbin/ethtool -A eth0 autoneg on Apr 16 20:48:17.426749 osdx modulelauncher[489847]: Command '/sbin/ethtool -A eth0 autoneg on' returned non-zero exit status 76. Apr 16 20:48:17.428504 osdx modulelauncher[489847]: osdx.utils.xos cmd error: /sbin/ethtool -s eth0 autoneg on advertise Pause off Asym_Pause off -- Apr 16 20:48:17.428518 osdx modulelauncher[489847]: Command '/sbin/ethtool -s eth0 autoneg on advertise Pause off Asym_Pause off --' returned non-zero exit status 75. Apr 16 20:48:17.447419 osdx (udev-worker)[489867]: Network interface NamePolicy= disabled on kernel command line. Apr 16 20:48:17.944485 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main". Apr 16 20:48:17.948236 osdx dhcpd[489977]: Wrote 0 leases to leases file. Apr 16 20:48:17.949304 osdx cfgd[1626]: [110216]Completed change to active configuration Apr 16 20:48:17.963295 osdx OSDxCLI[110216]: User 'admin' committed the configuration. Apr 16 20:48:17.973278 osdx dhcpd[489977]: Apr 16 20:48:17.973285 osdx dhcpd[489977]: No subnet declaration for eth0 (no IPv4 addresses). Apr 16 20:48:17.973288 osdx dhcpd[489977]: ** Ignoring requests on eth0. If this is not what Apr 16 20:48:17.973290 osdx dhcpd[489977]: you want, please write a subnet declaration Apr 16 20:48:17.973293 osdx dhcpd[489977]: in your dhcpd.conf file for the network segment Apr 16 20:48:17.973296 osdx dhcpd[489977]: to which interface eth0 is attached. ** Apr 16 20:48:17.973299 osdx dhcpd[489977]: Apr 16 20:48:17.983389 osdx OSDxCLI[110216]: User 'admin' left the configuration menu. Apr 16 20:48:17.984198 osdx dhcpd[489977]: Server starting service. Apr 16 20:48:18.731219 osdx dhcpd[489977]: DHCPDISCOVER from de:ad:be:ef:6c:20 via 20.0.0.2 Apr 16 20:48:18.732048 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=6079 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Apr 16 20:48:19.731400 osdx dhcpd[489977]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Apr 16 20:48:19.732183 osdx dhcpd[489977]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:20 (osdx) via 20.0.0.2 Apr 16 20:48:19.736056 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=6313 DF PROTO=UDP SPT=67 DPT=67 LEN=308 Apr 16 20:48:19.765942 osdx dhcpd[489977]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:20 (osdx) via 20.0.0.2