Hello all. I tried to configure freeradius to operate as dhcp server. I have one problem. Freeradius receives DHCP-Discover and DHCP-Request packets, but replies are not sent. In logs all OK, but strace output contains error EINVAL (Invalid argument) in packet sending via sendmsg. Freeradius version is 2.1.x from git. My config file: dhcp:=========================== listen { ipaddr = * port = 67 type = dhcp interface = eth0 broadcast = yes } dhcp DHCP-Discover { linelog update reply { DHCP-Message-Type = DHCP-Offer DHCP-Domain-Name-Server = 192.168.194.169 DHCP-Domain-Name-Server = 192.168.192.53 DHCP-Subnet-Mask = 255.255.255.128 DHCP-Router-Address = 192.168.194.126 DHCP-IP-Address-Lease-Time = 86400 DHCP-DHCP-Server-Identifier = 192.168.194.105 DHCP-Your-IP-Address = 192.168.194.106 } linelog ok } dhcp DHCP-Request { update reply { DHCP-Message-Type = DHCP-Ack } update reply { DHCP-Domain-Name-Server = 192.168.194.169 DHCP-Domain-Name-Server = 192.168.192.53 DHCP-Subnet-Mask = 255.255.255.128 DHCP-Router-Address = 192.168.194.126 DHCP-IP-Address-Lease-Time = 86400 DHCP-DHCP-Server-Identifier = 192.168.194.105 DHCP-Your-IP-Address = 192.168.194.106 } ok } dhcp:=========================== Log fragment: freeradius -X ================== Received DHCP-Discover of id f1b3e779 from 0.0.0.0:68 to 255.255.255.255:67 DHCP-Opcode = Client-Message DHCP-Hardware-Type = Ethernet DHCP-Hardware-Address-Length = 6 DHCP-Hop-Count = 0 DHCP-Transaction-Id = 4055099257 DHCP-Number-of-Seconds = 31 DHCP-Flags = 0 DHCP-Client-IP-Address = 0.0.0.0 DHCP-Your-IP-Address = 0.0.0.0 DHCP-Server-IP-Address = 0.0.0.0 DHCP-Gateway-IP-Address = 0.0.0.0 DHCP-Client-Hardware-Address = 00:22:15:30:16:7b DHCP-Message-Type = DHCP-Discover DHCP-Requested-IP-Address = 192.168.194.106 DHCP-Hostname = "capt-eee" DHCP-Parameter-Request-List = DHCP-Subnet-Mask DHCP-Parameter-Request-List = DHCP-Broadcast-Address DHCP-Parameter-Request-List = DHCP-Time-Offset DHCP-Parameter-Request-List = DHCP-Router-Address DHCP-Parameter-Request-List = DHCP-Domain-Name DHCP-Parameter-Request-List = DHCP-Domain-Name-Server DHCP-Parameter-Request-List = DHCP-Domain-Search DHCP-Parameter-Request-List = DHCP-Hostname DHCP-Parameter-Request-List = DHCP-NETBIOS-Name-Servers DHCP-Parameter-Request-List = DHCP-NETBIOS DHCP-Parameter-Request-List = DHCP-Interface-MTU-Size DHCP-Parameter-Request-List = DHCP-Classless-Static-Route DHCP-Parameter-Request-List = DHCP-NTP-Servers server dhcp { Trying sub-section dhcp DHCP-Discover {...} +- entering group DHCP-Discover {...} [linelog] expand: %{reply:DHCP-Message-Type} -> [linelog] ... expanding second conditional [linelog] expand: %{request:DHCP-Message-Type} -> DHCP-Discover [linelog] expand: %{%{reply:DHCP-Message-Type}:-%{request:DHCP-Message-Type}} -> DHCP-Discover [linelog] expand: /var/log/radius/linelog -> /var/log/radius/linelog [linelog] expand: %{DHCP-Transaction-Id} DISCOVER: [%{DHCP-Client-Hardware-Address}] via (%{DHCP-Gateway-IP-Address}) %{DHCP-Hostname} -> 4055099257 DISCOVER: [00:22:15:30:16:7b] via (0.0.0.0) capt-eee ++[linelog] returns ok ++[reply] returns ok [linelog] expand: %{reply:DHCP-Message-Type} -> DHCP-Offer [linelog] expand: %{%{reply:DHCP-Message-Type}:-%{request:DHCP-Message-Type}} -> DHCP-Offer [linelog] expand: /var/log/radius/linelog -> /var/log/radius/linelog [linelog] expand: %{DHCP-Transaction-Id} OFFER: %{reply:DHCP-Your-IP-Address} to [%{DHCP-Client-Hardware-Address}] ... -> 4055099257 OFFER: 192.168.194.106 to [00:22:15:30:16:7b] ... ++[linelog] returns ok ++[ok] returns ok } # server dhcp Sending DHCP-Offer of id f1b3e779 from 0.0.0.0:67 to 255.255.255.255:68 DHCP-Subnet-Mask = 255.255.255.128 DHCP-Router-Address = 192.168.194.126 DHCP-Domain-Name-Server = 192.168.194.169 DHCP-IP-Address-Lease-Time = 86400 DHCP-DHCP-Server-Identifier = 192.168.194.105 Finished request 5. Cleaning up request 5 ID -239868039 with timestamp +85 Going to the next request Ready to process requests. freeradius -X ================== STRACE output ================= write(1, "Ready to process requests.\n", 27) = 27 select(20, [11 13 14 15 16 17 18 19], NULL, NULL, NULL) = 1 (in [17]) getsockname(17, {sa_family=AF_INET, sin_port=htons(67), sin_addr=inet_addr("0.0.0.0")}, [16]) = 0 recvmsg(17, {msg_name(16)={sa_family=AF_INET, sin_port=htons(68), sin_addr=inet_addr("0.0.0.0")}, msg_iov(1)=[{"\1\1\6\0\361\263\347y\0\37\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\"\0250"..., 1460}], msg_controllen=32, {cmsg_len=28, cmsg_level=SOL_IP, cmsg_type=, ...}, msg_flags=0}, 0) = 300 write(1, "Received DHCP-Discover of id f1b"..., 76) = 76 write(1, "\tDHCP-Opcode = Client-Message\n", 30) = 30 write(1, "\tDHCP-Hardware-Type = Ethernet\n", 31) = 31 write(1, "\tDHCP-Hardware-Address-Length = "..., 34) = 34 write(1, "\tDHCP-Hop-Count = 0\n", 20) = 20 write(1, "\tDHCP-Transaction-Id = 405509925"..., 34) = 34 write(1, "\tDHCP-Number-of-Seconds = 31\n", 29) = 29 write(1, "\tDHCP-Flags = 0\n", 16) = 16 write(1, "\tDHCP-Client-IP-Address = 0.0.0."..., 34) = 34 write(1, "\tDHCP-Your-IP-Address = 0.0.0.0\n", 32) = 32 write(1, "\tDHCP-Server-IP-Address = 0.0.0."..., 34) = 34 write(1, "\tDHCP-Gateway-IP-Address = 0.0.0"..., 35) = 35 write(1, "\tDHCP-Client-Hardware-Address = "..., 50) = 50 write(1, "\tDHCP-Message-Type = DHCP-Discov"..., 35) = 35 write(1, "\tDHCP-Requested-IP-Address = 80."..., 43) = 43 write(1, "\tDHCP-Hostname = \"capt-eee\"\n", 28) = 28 write(1, "\tDHCP-Parameter-Request-List = D"..., 48) = 48 write(1, "\tDHCP-Parameter-Request-List = D"..., 54) = 54 write(1, "\tDHCP-Parameter-Request-List = D"..., 48) = 48 write(1, "\tDHCP-Parameter-Request-List = D"..., 51) = 51 write(1, "\tDHCP-Parameter-Request-List = D"..., 48) = 48 write(1, "\tDHCP-Parameter-Request-List = D"..., 55) = 55 write(1, "\tDHCP-Parameter-Request-List = D"..., 50) = 50 write(1, "\tDHCP-Parameter-Request-List = D"..., 45) = 45 write(1, "\tDHCP-Parameter-Request-List = D"..., 57) = 57 write(1, "\tDHCP-Parameter-Request-List = D"..., 44) = 44 write(1, "\tDHCP-Parameter-Request-List = D"..., 55) = 55 write(1, "\tDHCP-Parameter-Request-List = D"..., 59) = 59 write(1, "\tDHCP-Parameter-Request-List = D"..., 48) = 48 write(1, "server dhcp {\n", 14) = 14 write(1, "Trying sub-section dhcp DHCP-Dis"..., 44) = 44 write(1, "+- entering group DHCP-Discover "..., 38) = 38 write(1, "[linelog] \texpand: %{reply:DHCP-"..., 50) = 50 write(1, "[linelog] \t... expanding second "..., 44) = 44 write(1, "[linelog] \texpand: %{request:DHC"..., 65) = 65 write(1, "[linelog] \texpand: %{%{reply:DHC"..., 96) = 96 write(1, "[linelog] \texpand: /var/log/radi"..., 70) = 70 open("/var/log/radius/linelog", O_WRONLY|O_CREAT|O_APPEND, 0600) = 20 write(1, "[linelog] \texpand: %{DHCP-Transa"..., 203) = 203 write(20, "4055099257 DISCOVER: [00:22:15:3"..., 64) = 64 close(20) = 0 write(1, "++[linelog] returns ok\n", 23) = 23 write(1, "++[reply] returns ok\n", 21) = 21 write(1, "[linelog] \texpand: %{reply:DHCP-"..., 60) = 60 write(1, "[linelog] \texpand: %{%{reply:DHC"..., 93) = 93 write(1, "[linelog] \texpand: /var/log/radi"..., 70) = 70 open("/var/log/radius/linelog", O_WRONLY|O_CREAT|O_APPEND, 0600) = 20 write(1, "[linelog] \texpand: %{DHCP-Transa"..., 182) = 182 write(20, "4055099257 OFFER: 80.91.194.106 "..., 59) = 59 close(20) = 0 write(1, "++[linelog] returns ok\n", 23) = 23 write(1, "++[ok] returns ok\n", 18) = 18 write(1, "} # server dhcp\n", 16) = 16 write(1, "Sending DHCP-Offer of id f1b3e77"..., 72) = 72 write(1, "\tDHCP-Subnet-Mask = 255.255.255."..., 36) = 36 write(1, "\tDHCP-Router-Address = 80.91.194"..., 37) = 37 write(1, "\tDHCP-Domain-Name-Server = 80.91"..., 41) = 41 write(1, "\tDHCP-IP-Address-Lease-Time = 86"..., 36) = 36 write(1, "\tDHCP-DHCP-Server-Identifier = 8"..., 45) = 45 sendmsg(17, {msg_name(16)={sa_family=AF_INET, sin_port=htons(68), sin_addr=inet_addr("255.255.255.255")}, msg_iov(1)=[{"\2\1\6\0\361\263\347y\0\0\0\0\0\0\0\0P[\302jP[\302i\0\0\0\0\0\"\0250"..., 300}], msg_controllen=32, {cmsg_len=28, cmsg_level=SOL_IP, cmsg_type=, ...}, msg_flags=0}, 0) = -1 EINVAL (Invalid argument) write(1, "Finished request 5.\n", 20) = 20 write(1, "Cleaning up request 5 ID -239868"..., 55) = 55 write(1, "Going to the next request\n", 26) = 26 wait4(-1, NULL, 0, NULL) = -1 ECHILD (No child processes) write(1, "Ready to process requests.\n", 27) = 27 STRACE output =================