Check-Mac-Address
These scenarios show how the feature
check-mac-address works for DHCP server
Test Check MAC Address
Description
The check-mac-address option filters packets if there are differences between the MAC address found at the ethernet header and the MAC address found in the DHCP packet.
To check this option, you should send packets with these differences and enable this option and see if there are warnings in your logs.
Also, this test check the server’s behaviour in regular conditions.
Scenario
Step 1: Set the following configuration in DUT0:
set interfaces ethernet eth0 address 10.0.0.1/24 set service dhcp-server shared-network dhcp subnet 10.0.0.0/24 start 10.0.0.5 stop 10.0.0.5
Step 2: Run command system journal show | tail at DUT0 and check if output contains the following tokens:
DHCPDISCOVER from 10:00:00:00:00:02 via eth0Show output
Feb 26 18:56:08.451691 osdx OSDxCLI[1563]: User 'admin' added a new cfg line: 'set service dhcp-server shared-network dhcp subnet 10.0.0.0/24 start 10.0.0.5 stop 10.0.0.5'. Feb 26 18:56:08.609355 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Feb 26 18:56:08.704872 osdx systemd[1]: Started "DHCP Server Service instance main". Feb 26 18:56:08.709285 osdx cfgd[997]: [1563]Completed change to active configuration Feb 26 18:56:08.730400 osdx OSDxCLI[1563]: User 'admin' committed the configuration. Feb 26 18:56:08.737568 osdx dhcpd[30826]: Wrote 0 leases to leases file. Feb 26 18:56:08.776880 osdx OSDxCLI[1563]: User 'admin' left the configuration menu. Feb 26 18:56:08.935079 osdx dhcpd[30826]: Server starting service. Feb 26 18:56:08.972469 osdx OSDxCLI[1563]: User 'admin' executed a new command: 'system journal show | tail'. Feb 26 18:56:09.522408 osdx dhcpd[30826]: DHCPDISCOVER from 10:00:00:00:00:02 via eth0
Step 3: Set the following configuration in DUT0:
set service dhcp-server check-mac-address
Step 4: Run command system journal clear at DUT0.
Step 5: Run command system journal show | tail at DUT0 and check if output does not contain the following tokens:
DHCPDISCOVER from 10:00:00:00:00:02 via eth0Show output
-- Logs begin at Mon 2024-02-26 18:56:10 UTC, end at Mon 2024-02-26 18:56:10 UTC. -- Feb 26 18:56:10.853170 osdx systemd-journald[1369]: Runtime journal (/run/log/journal/bb5e03885d754db09ee63ec3d68ce029) is 2.0M, max 16.0M, 14.0M free. Feb 26 18:56:10.871939 osdx OSDxCLI[1563]: User 'admin' executed a new command: 'system journal clear'.
Step 6: Run command system journal show | tail at DUT0 and check if output contains the following tokens:
MAC received in DHCP packet (10:00:00:00:00:02) is different than source MAC in ethernet header (10:00:00:00:00:01)Show output
-- Logs begin at Mon 2024-02-26 18:56:10 UTC, end at Mon 2024-02-26 18:56:11 UTC. -- Feb 26 18:56:10.853170 osdx systemd-journald[1369]: Runtime journal (/run/log/journal/bb5e03885d754db09ee63ec3d68ce029) is 2.0M, max 16.0M, 14.0M free. Feb 26 18:56:10.871939 osdx OSDxCLI[1563]: User 'admin' executed a new command: 'system journal clear'. Feb 26 18:56:10.977546 osdx OSDxCLI[1563]: User 'admin' executed a new command: 'system journal show | tail'. Feb 26 18:56:11.103445 osdx OSDxCLI[1563]: User 'admin' executed a new command: 'system journal show | tail'. Feb 26 18:56:11.586368 osdx dhcpd[30868]: MAC received in DHCP packet (10:00:00:00:00:02) is different than source MAC in ethernet header (10:00:00:00:00:01)
Step 7: Set the following configuration in DUT1:
set interfaces eth0 mac 10:00:00:00:00:05
Step 8: Set the following configuration in DUT1:
set interfaces eth0 address dhcp
Step 9: Run command interfaces ethernet eth0 show at DUT1 and check if output contains the following tokens:
10.0.0.5Show output
----------------------------------------------------------------- Name IP Address Admin Oper Vrf Description ----------------------------------------------------------------- eth0 10.0.0.5/24 up up fe80::dcad:beff:feef:6c20/64
Step 10: Run command service dhcp-server show leases main | grep 10.0.0.5 at DUT0 and check if output contains the following tokens:
10:00:00:00:00:05Show output
10.0.0.5 10:00:00:00:00:05 2024/02/26 18:56:14 2024/02/27 06:56:14 2024/02/26 18:56:14
Test Check MAC Address VRF
Description
This scenario configures a DHCP server with VRF instead of regular interfaces and checks the option check-mac-address.
To check this option you will need to send packets with differences in Source MAC for link layer and the client MAC from the application layer.
Scenario
Step 1: Set the following configuration in DUT0:
set interfaces eth0 address 10.0.0.1/24 set interfaces eth0 vrf VRF0 set service dhcp-server shared-network dhcp local-vrf VRF0 set service dhcp-server shared-network dhcp subnet 10.0.0.0/24 start 10.0.0.5 stop 10.0.0.6 set system vrf VRF0
Step 2: Run command system journal show | tail at DUT0 and check if output contains the following tokens:
DHCPDISCOVER from 10:00:00:00:00:02 via eth0Show output
Feb 26 18:56:25.203012 osdx cfgd[997]: [1563]Completed change to active configuration Feb 26 18:56:25.222360 osdx dhcpd[31170]: Wrote 0 leases to leases file. Feb 26 18:56:25.224156 osdx OSDxCLI[1563]: User 'admin' committed the configuration. Feb 26 18:56:25.263334 osdx OSDxCLI[1563]: User 'admin' left the configuration menu. Feb 26 18:56:25.297908 osdx dhcpd[31170]: Server starting service. Feb 26 18:56:25.454470 osdx OSDxCLI[1563]: User 'admin' executed a new command: 'system journal show | tail'. Feb 26 18:56:25.519499 osdx dhcpd[31170]: DHCPDISCOVER from 10:00:00:00:00:02 via eth0 Feb 26 18:56:26.520680 osdx dhcpd[31170]: DHCPOFFER on 10.0.0.5 to 10:00:00:00:00:02 via eth0 Feb 26 18:56:26.550807 osdx dhcpd[31170]: DHCPDISCOVER from 10:00:00:00:00:02 via eth0 Feb 26 18:56:26.550834 osdx dhcpd[31170]: DHCPOFFER on 10.0.0.5 to 10:00:00:00:00:02 via eth0
Step 3: Set the following configuration in DUT0:
set service dhcp-server check-mac-address
Step 4: Run command system journal clear at DUT0.
Step 5: Run command system journal show | tail at DUT0 and check if output does not contain the following tokens:
DHCPDISCOVER from 10:00:00:00:00:02 via eth0Show output
-- Logs begin at Mon 2024-02-26 18:56:27 UTC, end at Mon 2024-02-26 18:56:27 UTC. -- Feb 26 18:56:27.337400 osdx systemd-journald[1369]: Runtime journal (/run/log/journal/bb5e03885d754db09ee63ec3d68ce029) is 2.0M, max 16.0M, 14.0M free. Feb 26 18:56:27.355036 osdx OSDxCLI[1563]: User 'admin' executed a new command: 'system journal clear'.
Step 6: Run command system journal show | tail at DUT0 and check if output contains the following tokens:
MAC received in DHCP packet (10:00:00:00:00:02) is different than source MAC in ethernet header (10:00:00:00:00:01)Show output
-- Logs begin at Mon 2024-02-26 18:56:27 UTC, end at Mon 2024-02-26 18:56:27 UTC. -- Feb 26 18:56:27.337400 osdx systemd-journald[1369]: Runtime journal (/run/log/journal/bb5e03885d754db09ee63ec3d68ce029) is 2.0M, max 16.0M, 14.0M free. Feb 26 18:56:27.355036 osdx OSDxCLI[1563]: User 'admin' executed a new command: 'system journal clear'. Feb 26 18:56:27.461358 osdx OSDxCLI[1563]: User 'admin' executed a new command: 'system journal show | tail'. Feb 26 18:56:27.582844 osdx dhcpd[31212]: MAC received in DHCP packet (10:00:00:00:00:02) is different than source MAC in ethernet header (10:00:00:00:00:01)
Step 7: Set the following configuration in DUT1:
set interfaces eth0 mac 10:00:00:00:00:05
Step 8: Set the following configuration in DUT1:
set interfaces eth0 address dhcp
Step 9: Run command interfaces ethernet eth0 show at DUT1 and check if output contains the following tokens:
10.0.0.5Show output
----------------------------------------------------------------- Name IP Address Admin Oper Vrf Description ----------------------------------------------------------------- eth0 10.0.0.5/24 up up fe80::dcad:beff:feef:6c20/64
Step 10: Run command service dhcp-server show leases VRF0 | grep 10.0.0.5 at DUT0 and check if output contains the following tokens:
10:00:00:00:00:05Show output
10.0.0.5 10:00:00:00:00:05 2024/02/26 18:56:29 2024/02/27 06:56:29 2024/02/26 18:56:29