HI All, I'm testing freeradius server version 2.2.0. Worked fine using IPv4. When I switched to IPv6 I got the following error: Ignoring request to authentication address :: port 1812 from unknown client fe80::215:17ff:fed0:d278 port 41189 Here is the entry from the clients.conf: client goya { ipv6addr = fe80::215:17ff:fed0:d278 # netmask = 128 secret = test shortname = test-net } Radtest command used with output: radtest -6 test test fe80::21b:78ff:fe40:1de1 0 test Sending Access-Request of id 143 to fe80::21b:78ff:fe40:1de1 port 1812 User-Name = "test" User-Password = "test" NAS-IPv6-Address = ::1 NAS-Port = 0 Message-Authenticator = 0x00000000000000000000000000000000 Tcpdump on server: [root@jackass ~]# tcpdump -i eth0 host fe80::21b:78ff:fe40:1de1 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes 16:40:27.693362 fe80::21b:78ff:fe40:1de1 > fe80::215:17ff:fed0:d278: icmp6: neighbor adv: tgt is fe80::21b:78ff:fe40:1de1 16:40:27.693704 fe80::215:17ff:fed0:d278.48743 > fe80::21b:78ff:fe40:1de1.radius: RADIUS, Access Request (1), id: 0x20 length: 86 16:40:32.692677 fe80::21b:78ff:fe40:1de1 > fe80::215:17ff:fed0:d278: icmp6: neighbor sol: who has fe80::215:17ff:fed0:d278 16:40:32.694009 fe80::215:17ff:fed0:d278 > fe80::21b:78ff:fe40:1de1: icmp6: neighbor adv: tgt is fe80::215:17ff:fed0:d278 16:40:32.697159 fe80::215:17ff:fed0:d278.48743 > fe80::21b:78ff:fe40:1de1.radius: RADIUS, Access Request (1), id: 0x20 length: 86 16:40:37.702304 fe80::215:17ff:fed0:d278.48743 > fe80::21b:78ff:fe40:1de1.radius: RADIUS, Access Request (1), id: 0x20 length: 86 Ifconfig on server: [root@jackass ~]# ifconfig eth0 eth0 Link encap:Ethernet HWaddr 00:1B:78:40:1D:E1 inet addr:10.10.20.208 Bcast:10.10.20.255 Mask:255.255.255.0 inet6 addr: fe80::21b:78ff:fe40:1de1/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:11032790 errors:0 dropped:0 overruns:0 frame:0 TX packets:282990 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2421527725 (2.2 GiB) TX bytes:116875391 (111.4 MiB) Interrupt:209 Here is the related logs from radius -X: radiusd: #### Loading Clients #### client 127.0.0.1 { require_message_authenticator = no secret = "testing123" shortname = "localhost" nastype = "other" } client 10.10.0.0/16 { require_message_authenticator = no secret = "test" shortname = "test-net" } client goya { ipv6addr = fe80::215:17ff:fed0:d278 IPv6 address [fe80::215:17ff:fed0:d278] require_message_authenticator = no secret = "test" shortname = "test-net" } ... radiusd: #### Opening IP addresses and Ports #### listen { type = "auth" ipv6addr = :: IPv6 address [::] port = 0 } listen { type = "acct" ipv6addr = :: IPv6 address [::] port = 0 } listen { type = "control" listen { socket = "/usr/local/var/run/radiusd/radiusd.sock" } } listen { type = "auth" ipaddr = 127.0.0.1 port = 18120 } ... adding new socket proxy address * port 53193 Listening on authentication address :: port 1812 Listening on accounting address :: port 1813 Listening on command file /usr/local/var/run/radiusd/radiusd.sock Listening on authentication address 127.0.0.1 port 18120 as server inner-tunnel Listening on proxy address :: port 1814 Ready to process requests. Ignoring request to authentication address :: port 1812 from unknown client fe80::215:17ff:fed0:d278 port 43140 Ready to process requests. Ignoring request to authentication address :: port 1812 from unknown client fe80::215:17ff:fed0:d278 port 43140 Ready to process requests. Ignoring request to authentication address :: port 1812 from unknown client fe80::215:17ff:fed0:d278 port 43140 Thanks in advance, Mike