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.

../../../../_images/local.svg

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 1
Show 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=0.237 ms

--- 10.0.0.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.237/0.237/0.237/0.000 ms

Step 5: Run command interfaces ethernet show at DUT2 and check if output contains the following tokens:

20.0.0.50
Show 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=10.0.0.1
Show output
Oct 07 12:58:16.338801 osdx systemd-journald[1498]: Runtime Journal (/run/log/journal/ea535239cdf24d6195135cccfda89139) is 1.3M, max 9.7M, 8.4M free.
Oct 07 12:58:16.339371 osdx systemd-journald[1498]: Received client request to rotate journal, rotating.
Oct 07 12:58:16.339416 osdx systemd-journald[1498]: Vacuuming done, freed 0B of archived journals from /run/log/journal/ea535239cdf24d6195135cccfda89139.
Oct 07 12:58:16.353592 osdx OSDxCLI[117440]: User 'admin' executed a new command: 'system journal clear'.
Oct 07 12:58:16.836758 osdx osdx-coredump[215999]: Deleting all coredumps in /opt/vyatta/etc/config/coredump...
Oct 07 12:58:16.846920 osdx OSDxCLI[117440]: User 'admin' executed a new command: 'system coredump delete all'.
Oct 07 12:58:18.332821 osdx OSDxCLI[117440]: User 'admin' entered the configuration menu.
Oct 07 12:58:18.418667 osdx OSDxCLI[117440]: User 'admin' added a new cfg line: 'set interfaces eth0.100 address 10.0.0.1/24'.
Oct 07 12:58:18.522327 osdx OSDxCLI[117440]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dummy subnet 10.0.0.1/32'.
Oct 07 12:58:18.588260 osdx OSDxCLI[117440]: 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 07 12:58:18.673402 osdx OSDxCLI[117440]: User 'admin' added a new cfg line: 'set protocols static route 0.0.0.0/0 next-hop 10.0.0.2'.
Oct 07 12:58:18.731928 osdx OSDxCLI[117440]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 log prefix DHCP_'.
Oct 07 12:58:18.829623 osdx OSDxCLI[117440]: User 'admin' added a new cfg line: 'set traffic policy LOGGER rule 1 selector UDP'.
Oct 07 12:58:18.886102 osdx OSDxCLI[117440]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 protocol udp'.
Oct 07 12:58:18.988552 osdx OSDxCLI[117440]: User 'admin' added a new cfg line: 'set traffic selector UDP rule 1 destination port 67'.
Oct 07 12:58:19.052672 osdx OSDxCLI[117440]: User 'admin' added a new cfg line: 'set interfaces eth0.100 traffic policy in LOGGER'.
Oct 07 12:58:19.163199 osdx OSDxCLI[117440]: User 'admin' added a new cfg line: 'show working'.
Oct 07 12:58:19.303430 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0
Oct 07 12:58:19.330077 osdx (udev-worker)[216086]: Network interface NamePolicy= disabled on kernel command line.
Oct 07 12:58:19.527569 osdx systemd[1]: Started dhcpd@main.service - "DHCP Server Service instance main".
Oct 07 12:58:19.530414 osdx cfgd[1206]: [117440]Completed change to active configuration
Oct 07 12:58:19.532872 osdx dhcpd[216127]: Wrote 0 leases to leases file.
Oct 07 12:58:19.559078 osdx OSDxCLI[117440]: User 'admin' committed the configuration.
Oct 07 12:58:19.562509 osdx dhcpd[216127]:
Oct 07 12:58:19.562513 osdx dhcpd[216127]: No subnet declaration for eth0 (no IPv4 addresses).
Oct 07 12:58:19.562515 osdx dhcpd[216127]: ** Ignoring requests on eth0.  If this is not what
Oct 07 12:58:19.562517 osdx dhcpd[216127]:    you want, please write a subnet declaration
Oct 07 12:58:19.562519 osdx dhcpd[216127]:    in your dhcpd.conf file for the network segment
Oct 07 12:58:19.562521 osdx dhcpd[216127]:    to which interface eth0 is attached. **
Oct 07 12:58:19.562523 osdx dhcpd[216127]:
Oct 07 12:58:19.567537 osdx dhcpd[216127]: Server starting service.
Oct 07 12:58:19.589573 osdx OSDxCLI[117440]: User 'admin' left the configuration menu.
Oct 07 12:58:20.216310 osdx dhcpd[216127]: DHCPDISCOVER from de:ad:be:ef:6c:30 via 20.0.0.2
Oct 07 12:58:20.219380 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=33974 DF PROTO=UDP SPT=67 DPT=67 LEN=308
Oct 07 12:58:21.216775 osdx dhcpd[216127]: DHCPOFFER on 20.0.0.50 to de:ad:be:ef:6c:30 (osdx) via 20.0.0.2
Oct 07 12:58:21.217617 osdx dhcpd[216127]: DHCPREQUEST for 20.0.0.50 (10.0.0.1) from de:ad:be:ef:6c:30 (osdx) via 20.0.0.2
Oct 07 12:58:21.219508 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=34140 DF PROTO=UDP SPT=67 DPT=67 LEN=308
Oct 07 12:58:21.230517 osdx dhcpd[216127]: DHCPACK on 20.0.0.50 to de:ad:be:ef:6c:30 (osdx) via 20.0.0.2