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
Jun 24 13:01:04.085466 osdx OSDxCLI[19184]: User 'admin' added a new cfg line: 'set interfaces ethernet eth0 address 10.0.0.1/24'. Jun 24 13:01:04.215342 osdx OSDxCLI[19184]: 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'. Jun 24 13:01:04.399647 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Jun 24 13:01:04.477805 osdx systemd[1]: Started "DHCP Server Service instance main". Jun 24 13:01:04.481149 osdx cfgd[1115]: [19184]Completed change to active configuration Jun 24 13:01:04.485620 osdx OSDxCLI[19184]: User 'admin' committed the configuration. Jun 24 13:01:04.486905 osdx dhcpd[21569]: Wrote 0 leases to leases file. Jun 24 13:01:04.550014 osdx OSDxCLI[19184]: User 'admin' left the configuration menu. Jun 24 13:01:04.588195 osdx dhcpd[21569]: Server starting service. Jun 24 13:01:04.709582 osdx dhcpd[21569]: 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 2024-06-24 13:01:05 UTC, end at Mon 2024-06-24 13:01:05 UTC. -- Jun 24 13:01:05.602582 osdx systemd-journald[596]: Runtime journal (/run/log/journal/9a819f3302304ea795867ea7c248068f) is 2.0M, max 16.0M, 14.0M free. Jun 24 13:01:05.627064 osdx OSDxCLI[19184]: 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 2024-06-24 13:01:05 UTC, end at Mon 2024-06-24 13:01:05 UTC. -- Jun 24 13:01:05.602582 osdx systemd-journald[596]: Runtime journal (/run/log/journal/9a819f3302304ea795867ea7c248068f) is 2.0M, max 16.0M, 14.0M free. Jun 24 13:01:05.627064 osdx OSDxCLI[19184]: User 'admin' executed a new command: 'system journal clear'. Jun 24 13:01:05.721054 osdx OSDxCLI[19184]: User 'admin' executed a new command: 'system journal show | tail'. Jun 24 13:01:05.751471 osdx dhcpd[21606]: 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 2024/06/24 13:01:08 2024/06/25 01:01:08 2024/06/24 13:01:08
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
Jun 24 13:01:16.951497 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Jun 24 13:01:16.987450 osdx kernel: 8021q: adding VLAN 0 to HW filter on device eth0 Jun 24 13:01:17.044648 osdx systemd[1]: Started "DHCP Server Service instance VRF0". Jun 24 13:01:17.047403 osdx cfgd[1115]: [19184]Completed change to active configuration Jun 24 13:01:17.051509 osdx OSDxCLI[19184]: User 'admin' committed the configuration. Jun 24 13:01:17.057652 osdx dhcpd[21887]: Wrote 0 leases to leases file. Jun 24 13:01:17.077745 osdx OSDxCLI[19184]: User 'admin' left the configuration menu. Jun 24 13:01:17.135818 osdx dhcpd[21887]: Server starting service. Jun 24 13:01:17.261794 osdx OSDxCLI[19184]: User 'admin' executed a new command: 'system journal show | tail'. Jun 24 13:01:17.467288 osdx dhcpd[21887]: 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 2024-06-24 13:01:19 UTC, end at Mon 2024-06-24 13:01:19 UTC. -- Jun 24 13:01:19.124675 osdx systemd-journald[596]: Runtime journal (/run/log/journal/9a819f3302304ea795867ea7c248068f) is 2.0M, max 16.0M, 14.0M free. Jun 24 13:01:19.158680 osdx OSDxCLI[19184]: 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 2024-06-24 13:01:19 UTC, end at Mon 2024-06-24 13:01:19 UTC. -- Jun 24 13:01:19.124675 osdx systemd-journald[596]: Runtime journal (/run/log/journal/9a819f3302304ea795867ea7c248068f) is 2.0M, max 16.0M, 14.0M free. Jun 24 13:01:19.158680 osdx OSDxCLI[19184]: User 'admin' executed a new command: 'system journal clear'. Jun 24 13:01:19.245300 osdx OSDxCLI[19184]: User 'admin' executed a new command: 'system journal show | tail'. Jun 24 13:01:19.380490 osdx OSDxCLI[19184]: User 'admin' executed a new command: 'system journal show | tail'. Jun 24 13:01:19.555532 osdx dhcpd[21929]: 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 2024/06/24 13:01:22 2024/06/25 01:01:22 2024/06/24 13:01:22