Radius Capture
This scenario shows how to capture and filter RADIUS messages after 802.1x authentication.
Test 802.1x RADIUS Station-ID
Description
DUT0 is configured with an 802.1x authenticated interface and DUT1 acts as an 802.1x supplicant. RADIUS messages are captured in DUT0 to check if Station-Id attributes are included.
Scenario
Step 1: Set the following configuration in DUT0
:
set interfaces ethernet eth0 address 10.215.168.64/24 set interfaces ethernet eth1 802.1x authenticator aaa accounting list1 set interfaces ethernet eth1 802.1x authenticator aaa authentication list1 set interfaces ethernet eth1 802.1x authenticator reauth-period 0 set interfaces ethernet eth1 address 192.168.100.1/24 set system aaa group radius radgroup1 server serv1 set system aaa list list1 method 1 group radius radgroup1 set system aaa server radius serv1 address 10.215.168.1 set system aaa server radius serv1 encrypted-key U2FsdGVkX18PU6o1GXU70Q9iRTml7t6mOrV8hwHygwRSxDFK2U3mTD75BY5VpWDBNwDS9YcL9L3oFoJc/KXc/w== set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 2: Ping IP address 10.215.168.1
from DUT0
:
admin@DUT0$ ping 10.215.168.1 count 1 size 56 timeout 1Show output
PING 10.215.168.1 (10.215.168.1) 56(84) bytes of data. 64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.211 ms --- 10.215.168.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.211/0.211/0.211/0.000 ms
Note
Start packet capture in DUT0 to filter RADIUS messages
Step 3: Set the following configuration in DUT1
:
set interfaces ethernet eth1 802.1x supplicant encrypted-password U2FsdGVkX18ZP/VYb0ENUv9nKLQnfzepywhoA+whSD4= set interfaces ethernet eth1 802.1x supplicant username testing set interfaces ethernet eth1 address 192.168.100.2/24 set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 4: Run command interfaces ethernet eth1 802.1x supplicant show status
at DUT1
and check if output contains the following tokens:
Authorized
Show output
--------------------------------------------------- Field Value --------------------------------------------------- EAP State SUCCESS EAP TLS Cipher ECDHE-RSA-AES256-GCM-SHA384 EAP TLS Version TLSv1.2 PAE State AUTHENTICATED Supplicant Port Status Authorized WPA State COMPLETED
Step 5: Ping IP address 192.168.100.1
from DUT1
:
admin@DUT1$ ping 192.168.100.1 count 1 size 56 timeout 1Show output
PING 192.168.100.1 (192.168.100.1) 56(84) bytes of data. 64 bytes from 192.168.100.1: icmp_seq=1 ttl=64 time=0.333 ms --- 192.168.100.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.333/0.333/0.333/0.000 ms
Note
Stop packet capture in DUT0
and expect
the following RADIUS messages:
Show output
tcpdump: listening on eth0, link-type EN10MB (Ethernet), snapshot length 262144 bytes 16:41:46.141894 de:ad:be:ef:6c:00 > fe:3c:ac:41:3d:8b, ethertype IPv4 (0x0800), length 183: (tos 0x0, ttl 64, id 20176, offset 0, flags [none], proto UDP (17), length 169) 10.215.168.64.34205 > 10.215.168.1.1813: [bad udp cksum 0x6696 -> 0x8e50!] RADIUS, length: 141 Accounting-Request (4), id: 0x0b, Authenticator: 6fbf46192359867b02a38a50e2822562 Acct-Status-Type Attribute (40), length: 6, Value: Start 0x0000: 0000 0001 Acct-Authentic Attribute (45), length: 6, Value: RADIUS 0x0000: 0000 0001 User-Name Attribute (1), length: 9, Value: testing 0x0000: 7465 7374 696e 67 Called-Station-Id Attribute (30), length: 20, Value: DE-AD-BE-EF-6C-01: 0x0000: 4445 2d41 442d 4245 2d45 462d 3643 2d30 0x0010: 313a Service-Type Attribute (6), length: 6, Value: Framed 0x0000: 0000 0002 Calling-Station-Id Attribute (31), length: 19, Value: DE-AD-BE-EF-6C-11 0x0000: 4445 2d41 442d 4245 2d45 462d 3643 2d31 0x0010: 31 Acct-Session-Id Attribute (44), length: 18, Value: 6E88003C5B3D9BE3 0x0000: 3645 3838 3030 3343 3542 3344 3942 4533 NAS-Port-Type Attribute (61), length: 6, Value: Ethernet 0x0000: 0000 000f Connect-Info Attribute (77), length: 13, Value: Unsupported 0x0000: 556e 7375 7070 6f72 7465 64 NAS-Port-Id Attribute (87), length: 6, Value: eth1 0x0000: 6574 6831 Event-Timestamp Attribute (55), length: 6, Value: Tue Jun 24 16:41:46 2025 0x0000: 685a d54a Acct-Delay-Time Attribute (41), length: 6, Value: 00 secs 0x0000: 0000 0000 1 packet captured 1 packet received by filter 0 packets dropped by kernel admin@osdx$