Manual:RADIUS Client

Summary

Sub-menu: /radius
Standards: RADIUS RFC 2865

RADIUS, short for Remote Authentication Dial-In User Service, is a remote server that provides authentication and accounting facilities to various network apliances. RADIUS authentication and accounting gives the ISP or network administrator ability to manage PPP user access and accounting from one server throughout a large network. The MikroTik RouterOS has a RADIUS client which can authenticate for HotSpot, PPP, PPPoE, PPTP, L2TP and ISDN connections. The attributes received from RADIUS server override the ones set in the default profile, but if some parameters are not received they are taken from the respective default profile.

The RADIUS server database is consulted only if no matching user acces record is found in router's local database.

Traffic is accounted locally with MikroTik Traffic Flow and Cisco IP pairs and snapshot image can be gathered using Syslog utilities. If RADIUS accounting is enabled, accounting information is also sent to the RADIUS server default for that service.

RADIUS Client

This sub-menu allows to add/remove RADIUS clients.

Note: The order of added items in this list is significant.

Properties

Property	Description
accounting-backup (yes | no; Default: no)	Whether configuration is for backup RADIUS server
accounting-port (integer [1..65535]; Default: 1813)	RADIUS server port used for accounting
address (IPv4/IPv6 address; Default: 0.0.0.0)	IPv4 or IPv6 address of RADIUS server.
authentication-port (integer [1..65535]; Default: 1812)	RADIUS server port used for authentication.
called-id (string; Default: )	Value depends on Point-to-Point protocol: PPPoE - service name, PPTP - server's IP address, L2TP - server's IP address.
certificate (string; Default: )	Certificate file to use for communicating with RADIUS Server with RadSec enabled.
comment (string; Default: )
disabled (yes | no; Default: no)
domain (string; Default: )	Microsoft Windows domain of client passed to RADIUS servers that require domain validation.
protocol (radsec | udp; Default: udp)	Specifies the protocol to use when communicating with RADIUS Server.
realm (string; Default: )	Explicitly stated realm (user domain), so the users do not have to provide proper ISP domain name in user name.
secret (string; Default: )	Shared secret used to access the RADIUS server.
service (ppp|login|hotspot|wireless|dhcp; Default: )	Router services that will use this RADIUS server: hotspot - HotSpot authentication service login - router's local user authentication ppp - Point-to-Point clients authentication wireless - wireless client authentication dhcp - DHCP protocol client authentication (client's MAC address is sent as User-Name)
src-address (ipv4/ipv6 address; Default: 0.0.0.0)	Source IP/IPv6 address of the packets sent to RADIUS server
timeout (time; Default: 100ms)	Timeout after which the request should be resend

Note: Microsoft Windows clients send their usernames in form domain\username

Note: When RADIUS server is authenticating user with CHAP, MS-CHAPv1, MS-CHAPv2, it is not using shared secret, secret is used only in authentication reply, and router is verifying it. So if you have wrong shared secret, RADIUS server will accept request, but router won't accept reply. You can see that with /radius monitor command, "bad-replies" number should increase whenever somebody tries to connect.

Warning: If RadSec is enabled, make sure your RADIUS Server is using "radsec" as the shared secret, otherwise RADIUS Server will not be able to decrypt data correctly (unprintable characters). With RadSec RouterOS forces the shared secret to "radsec" regardless of what has been set manually (RFC6614). You can find configuration example with FreeRADIUS 3.x in the following link: https://wiki.geant.org/display/H2eduroam/freeradius3-flr

Example

• To setup a RADIUS Client for HotSpot and PPP services that will authenticate against a RADIUS Server (10.0.0.3), you need to do the following:

[admin@MikroTik] > /radius add service=hotspot,ppp address=10.0.0.3 secret=ex
[admin@MikroTik] > /radius print
Flags: X - disabled
  #   SERVICE         CALLED-ID     DOMAIN        ADDRESS         SECRET
  0   ppp,hotspot                                 10.0.0.3        ex

• To setup a RADIUS Client with RadSec, you need to do the following:

[admin@MikroTik] > /radius add service=hotspot,ppp address=10.0.0.3 secret=radsec protocol=radsec certificate=client.crt
[admin@MikroTik] > /radius print
Flags: X - disabled
  #   SERVICE         CALLED-ID     DOMAIN        ADDRESS         SECRET
  0   ppp,hotspot                                 10.0.0.3        radsec

Note: Make sure the specified certificate is trusted.

• To view RADIUS Client statistics, you need to do the following:

[admin@MikroTik] > /radius monitor 0
             pending: 0
            requests: 10
             accepts: 4
             rejects: 1
             resends: 15
            timeouts: 5
         bad-replies: 0
    last-request-rtt: 0s

• Make sure you enable RADIUS authentication for the desired services:

/ppp aaa set use-radius=yes
/ip hotspot profile set default use-radius=yes

Connection Terminating from RADIUS

Sub-menu: /radius incoming

This facility supports unsolicited messages sent from RADIUS server. Unsolicited messages extend RADIUS protocol commands, that allow to terminate a session which has already been connected from RADIUS server. For this purpose DM (Disconnect-Messages) are used. Disconnect messages cause a user session to be terminated immediately.

Note: RouterOS doesn't support POD (Packet of Disconnect) the other RADIUS access request packet that performs a similar function as Disconnect Messages

Properties

Property	Description
accept (yes | no; Default: no)	Whether to accept the unsolicited messages
port (integer; Default: 3799)	The port number to listen for the requests on

Supported RADIUS Attributes

Here you can download the RADIUS reference dictionary, which incorporates all the needed RADIUS attributes. This dictionary is the minimal dictionary, which is enough to support all features of MikroTik RouterOS. It is designed for FreeRADIUS, but may also be used with many other UNIX RADIUS servers (eg. XTRadius).

Note: it may conflict with the default configuration files of RADIUS server, which have references to the Attributes, absent in this dictionary. Please correct the configuration files, not the dictionary, as no other Attributes are supported by MikroTik RouterOS.

There is also the RADIUS MikroTik specific dictionary that can be included in an existing dictionary to support MikroTik vendor-specific Attributes.

Definitions

• PPPs - PPP, PPTP, PPPoE and ISDN
• default configuration - settings in default profile (for PPPs) or HotSpot server settings (for HotSpot)

Access-Request

• Service-Type - always is "Framed" (only for PPPs)
• Framed-Protocol - always is "PPP" (only for PPPs)
• NAS-Identifier - router identity
• NAS-IP-Address - IP address of the router itself
• NAS-Port - this Attribute indicates the physical port number of the NAS which is authenticating the user.
• Acct-Session-Id - unique session ID. the first two symbols of session ID represent service (PPP, Hotspot, etc.). The next symbol is incremented on each reboot. The last group of symbols is incremented on each new session. This means, that you can not get the same ID for 1 million re-connects on the same boot for the same RADIUS type service. If you lose session stop message and RADIUS server does still keep the session open, but then receives another session start message, then it must be aware that stop message was lost, close old session and start a new session.
• NAS-Port-Type - async PPP - "Async"; PPTP and L2TP - "Virtual"; PPPoE - "Ethernet"; ISDN - "ISDN Sync"; HotSpot - "Ethernet | Cable | Wireless-802.11" (according to the value of nas-port-type parameter in /ip hotspot p
• Calling-Station-Id - PPPoE and HotSpot- client MAC address in capital letters; PPTP and L2TP - client public IP address; ISDN - client MSN
• Called-Station-Id - PPPoE - service name; PPTP and L2TP - server IP address; ISDN - interface MSN; HotSpot - name of the HotSpot server
• NAS-Port-Id - async PPP - serial port name; PPPoE - ethernet interface name on which server is running; HotSpot - name of the physical HotSpot interface (if bridged, the bridge port name is showed here); not present for ISDN, PPTP and L2TP
• Framed-IP-Address - IP address of HotSpot client after Universal Client translation
• Mikrotik-Host-IP - IP address of HotSpot client before Universal Client translation (the original IP address of the client)
• User-Name - client login name
• MS-CHAP-Domain - User domain, if present
• Mikrotik-Realm - If it is set in /radius menu, it is included in every RADIUS request as Mikrotik-Realm attribute. If it is not set, the same value is sent as in MS-CHAP-Domain attribute (if MS-CHAP-Domain is missing, Realm is not included neither)
• WISPr-Location-ID - text string specified in radius-location-id property of the HotSpot server
• WISPr-Location-Name - text string specified in radius-location-name property of the HotSpot server
• WISPr-Logoff-URL - full link to the login page (for example, http://10.48.0.1/lv/logout)

Depending on authentication methods (NOTE: HotSpot uses CHAP by default and may use also PAP if unencrypted passwords are enabled, it can not use MSCHAP):

• User-Password - encrypted password (used with PAP authentication)
• CHAP-Password, CHAP-Challenge - encrypted password and challenge (used with CHAP authentication)
• MS-CHAP-Response, MS-CHAP-Challenge - encrypted password and challenge (used with MS-CHAPv1 authentication)
• MS-CHAP2-Response, MS-CHAP-Challenge - encrypted password and challenge (used with MS-CHAPv2 authentication)

Access-Accept

• Framed-IP-Address - IP address given to client. If address belongs to 127.0.0.0/8 or 224.0.0.0/3 networks, IP pool is used from the default profile to allocate client IP address. If Framed-IP-Address is specified, Framed-Pool is ignored
• Framed-IP-Netmask - client netmask. PPPs - if specified, a route will be created to the network Framed-IP-Address belongs to via the Framed-IP-Address gateway; HotSpot - ignored by HotSpot
• Framed-Pool - IP pool name (on the router) from which to get IP address for the client. If Framed-IP-Address is specified, this attribute is ignored
• Framed-IPv6-Prefix - Ipv6 prefix assigned for the client. Added in v5.8
• Mikrotik-Delegated-IPv6-Pool - IPv6 pool used for Prefix Delegation. Added in v5.9
• Delegated-IPv6-Prefix - IPv6 Prefix. Added in v6.43
• Delegated-IPv6-Prefix-Pool - IPv6 Prefix pool used for Prefix Delegation. Added in v6.43

NOTE: if Framed-IP-Address or Framed-Pool is specified it overrides remote-address in default configuration

• Idle-Timeout - overrides idle-timeout in the default configuration
• Session-Timeout - overrides session-timeout in the default configuration
• Port-Limit - maximal mumber of simultaneous connections using the same username (overrides te shared-users property of the HotSpot user profile)
• Class - cookie, will be included in Accounting-Request unchanged
• Framed-Route - routes to add on the server. Format is specified in RFC 2865 (Ch. 5.22), can be specified as many times as needed
• Filter-Id - firewall filter chain name. It is used to make a dynamic firewall rule. Firewall chain name can have suffix .in or .out, that will install rule only for incoming or outgoing traffic. Multiple Filter-id can be provided, but only last ones for incoming and outgoing is used. For PPPs - filter rules in ppp chain that will jump to the specified chain, if a packet has come to/from the client (that means that you should first create a ppp chain and make jump rules that would put actual traffic to this chain). The same applies for HotSpot, but the rules will be created in hotspot chain
• Mikrotik-Mark-Id - firewall mangle chain name (HotSpot only). The MikroTik RADIUS client upon receiving this attribute creates a dynamic firewall mangle rule with action=jump chain=hotspot and jump-target equal to the atribute value. Mangle chain name can have suffixes .in or .out, that will install rule only for incoming or outgoing traffic. Multiple Mark-id attributes can be provided, but only last ones for incoming and outgoing is used.
• Acct-Interim-Interval - interim-update for RADIUS client. PPP - if 0 uses the one specified in RADIUS client; HotSpot - only respected if radius-interim-update=received in HotSpot server profile
• MS-MPPE-Encryption-Policy - require-encryption property (PPPs only)
• MS-MPPE-Encryption-Types - use-encryption property, non-zero value means to use encryption (PPPs only)
• Ascend-Data-Rate - tx/rx data rate limitation if multiple attributes are provided, first limits tx data rate, second - rx data rate. If used together with Ascend-Xmit-Rate, specifies rx rate. 0 if unlimited. Ignored if Rate-Limit attribute is present
• Ascend-Xmit-Rate - tx data rate limitation. It may be used to specify tx limit only instead of sending two sequental Ascend-Data-Rate attributes (in that case Ascend-Data-Rate will specify the receive rate). 0 if unlimited. Ignored if Rate-Limit attribute is present
• MS-CHAP2-Success - auth. response if MS-CHAPv2 was used (for PPPs only)
• MS-MPPE-Send-Key, MS-MPPE-Recv-Key - encryption keys for encrypted PPPs provided by RADIUS server only is MS-CHAPv2 was used as authentication (for PPPs only)
• Ascend-Client-Gateway - client gateway for DHCP-pool HotSpot login method (HotSpot only)
• Mikrotik-Recv-Limit - total receive limit in bytes for the client
• Mikrotik-Recv-Limit-Gigawords - 4G (2^32) bytes of total receive limit (bits 32..63, when bits 0..31 are delivered in Mikrotik-Recv-Limit)
• Mikrotik-Xmit-Limit - total transmit limit in bytes for the client
• Mikrotik-Xmit-Limit-Gigawords - 4G (2^32) bytes of total transmit limit (bits 32..63, when bits 0..31 are delivered in Mikrotik-Recv-Limit)
• Mikrotik-Wireless-Forward - not forward the client's frames back to the wireless infrastructure if this attribute is set to "0" (Wireless only)
• Mikrotik-Wireless-Skip-Dot1x - disable 802.1x authentication for the particulat wireless client if set to non-zero value (Wireless only)
• Mikrotik-Wireless-Enc-Algo - WEP encryption algorithm: 0 - no encryption, 1 - 40-bit WEP, 2 - 104-bit WEP (Wireless only)
• Mikrotik-Wireless-Enc-Key - WEP encruption key for the client (Wireless only)
• Mikrotik-Wireless-VLANID - VLAN ID for the client (Wireless only)
• Mikrotik-Wireless-VLANID-type - VLAN ID type for the client. 0 - 802.1q tag and 1 - 802.1ad tag (Wireless only)
• Mikrotik-Switching-Filter - allows to create dynamic switch rules when authenticating clients with dot1x server.
• Mikrotik-Rate-Limit - Datarate limitation for clients. Format is: rx-rate[/tx-rate] [rx-burst-rate[/tx-burst-rate] [rx-burst-threshold[/tx-burst-threshold] [rx-burst-time[/tx-burst-time] [priority] [rx-rate-min[/tx-rate-min]]]] from the point of view of the router (so "rx" is client upload, and "tx" is client download). All rates should be numbers with optional 'k' (1,000s) or 'M' (1,000,000s). If tx-rate is not specified, rx-rate is as tx-rate too. Same goes for tx-burst-rate and tx-burst-threshold and tx-burst-time. If both rx-burst-threshold and tx-burst-threshold are not specified (but burst-rate is specified), rx-rate and tx-rate is used as burst thresholds. If both rx-burst-time and tx-burst-time are not specified, 1s is used as default. Priority takes values 1..8, where 1 implies the highest priority, but 8 - the lowest. If rx-rate-min and tx-rate-min are not specified rx-rate and tx-rate values are used. The rx-rate-min and tx-rate-min values can not exceed rx-rate and tx-rate values.
• Mikrotik-Group - Router local user group name (defines in /user group) for local users; HotSpot default profile for HotSpot users; PPP default profile name for PPP users.
• Mikrotik-Advertise-URL - URL of the page with advertisements that should be displayed to clients. If this attribute is specified, advertisements are enabled automatically, including transparent proxy, even if they were explicitly disabled in the corresponding user profile. Multiple attribute instances may be send by RADIUS server to specify additional URLs which are choosen in round robin fashion.
• Mikrotik-Advertise-Interval - Time interval between two adjacent advertisements. Multiple attribute instances may be send by RADIUS server to specify additional intervals. All interval values are treated as a list and are taken one-by-one for each successful advertisement. If end of list is reached, the last value is continued to be used.
• WISPr-Redirection-URL - URL, which the clients will be redirected to after successfull login
• WISPr-Bandwidth-Min-Up - minimal datarate (CIR) provided for the client upload
• WISPr-Bandwidth-Min-Down - minimal datarate (CIR) provided for the client download
• WISPr-Bandwidth-Max-Up - maxmal datarate (MIR) provided for the client upload
• WISPr-Bandwidth-Max-Down - maxmal datarate (MIR) provided for the client download
• WISPr-Session-Terminate-Time - time, when the user should be disconnected; in "YYYY-MM-DDThh:mm:ssTZD" form, where Y - year; M - month; D - day; T - separator symbol (must be written between date and time); h - hour (in 24 hour format); m - minute; s - second; TZD - time zone in one of these forms: "+hh:mm", "+hhmm", "-hh:mm", "-hhmm"

Note: the received attributes override the default ones (set in the default profile), but if an attribute is not received from RADIUS server, the default one is to be used.

Rate-Limit takes precedence over all other ways to specify data rate for the client. Ascend data rate attributes are considered second; and WISPr attributes takes the last precedence.

Here are some Rate-Limit examples:

• 128k - rx-rate=128000, tx-rate=128000 (no bursts)
• 64k/128M - rx-rate=64000, tx-rate=128000000
• 64k 256k - rx/tx-rate=64000, rx/tx-burst-rate=256000, rx/tx-burst-threshold=64000, rx/tx-burst-time=1s
• 64k/64k 256k/256k 128k/128k 10/10 - rx/tx-rate=64000, rx/tx-burst-rate=256000, rx/tx-burst-threshold=128000, rx/tx-burst-time=10s

Accounting-Request

The accounting request carries the same attributes as Access Request, plus these ones:

• Acct-Status-Type - Start, Stop, or Interim-Update
• Acct-Authentic - either authenticated by the RADIUS or Local authority (PPPs only)
• Class - RADIUS server cookie, as received in Access-Accept
• Acct-Delay-Time - how long does the router try to send this Accounting-Request packet

Stop and Interim-Update Accounting-Request

Additionally to the accounting start request, the following messages will contain the following attributes:

• Acct-Session-Time - connection uptime in seconds
• Acct-Input-Octets - bytes received from the client
• Acct-Input-Gigawords - 4G (2^32) bytes received from the client (bits 32..63, when bits 0..31 are delivered in Acct-Input-Octets)
• Acct-Input-Packets - nubmer of packets received from the client
• Acct-Output-Octets - bytes sent to the client
• Acct-Output-Gigawords - 4G (2^32) bytes sent to the client (bits 32..63, when bits 0..31 are delivered in Acct-Output-Octets)
• Acct-Output-Packets - number of packets sent to the client

Stop Accounting-Request

These packets will, additionally to the Interim Update packets, have:

• Acct-Terminate-Cause - session termination cause (see RFC 2866 ch. 5.10)

Change of Authorization

RADIUS disconnect and Change of Authorization (according to RFC3576) are supported as well. These attributes may be changed by a CoA request from the RADIUS server:

• Mikrotik-Group
• Mikrotik-Recv-Limit
• Mikrotik-Xmit-Limit
• Mikrotik-Rate-Limit
• Ascend-Data-Rate (only if Mikrotik-Rate-Limit is not present)
• Ascend-XMit-Rate (only if Mikrotik-Rate-Limit is not present)
• Mikrotik-Mark-Id
• Filter-Id
• Mikrotik-Advertise-Url
• Mikrotik-Advertise-Interval
• Session-Timeout
• Idle-Timeout
• Port-Limit

Note that it is not possible to change IP address, pool or routes that way - for such changes a user must be disconnected first.

MikroTik Specific RADIUS Attribute Numeric Values

Click here to get plain text attribute list of MikroTik specific attributes (FreeRadius comaptible) .

Name	VendorID	Value	RFC
MIKROTIK_RECV_LIMIT	14988	1
MIKROTIK_XMIT_LIMIT	14988	2
MIKROTIK_GROUP	14988	3
MIKROTIK_WIRELESS_FORWARD	14988	4
MIKROTIK_WIRELESS_SKIPDOT1X	14988	5
MIKROTIK_WIRELESS_ENCALGO	14988	6
MIKROTIK_WIRELESS_ENCKEY	14988	7
MIKROTIK_RATE_LIMIT	14988	8
MIKROTIK_REALM	14988	9
MIKROTIK_HOST_IP	14988	10
MIKROTIK_MARK_ID	14988	11
MIKROTIK_ADVERTISE_URL	14988	12
MIKROTIK_ADVERTISE_INTERVAL	14988	13
MIKROTIK_RECV_LIMIT_GIGAWORDS	14988	14
MIKROTIK_XMIT_LIMIT_GIGAWORDS	14988	15
MIKROTIK_WIRELESS_PSK	14988	16
MIKROTIK_TOTAL_LIMIT	14988	17
MIKROTIK_TOTAL_LIMIT_GIGAWORDS	14988	18
MIKROTIK_ADDRESS_LIST	14988	19
MIKROTIK_WIRELESS_MPKEY	14988	20
MIKROTIK_WIRELESS_COMMENT	14988	21
MIKROTIK_DELEGATED_IPV6_POOL	14988	22
MIKROTIK_DHCP_OPTION_SET	14988	23
MIKROTIK_DHCP_OPTION_PARAM_STR1	14988	24
MIKROTIK_DHCP_OPTION_PARAM_STR2	14988	25
MIKROTIK_WIRELESS_VLANID	14988	26
MIKROTIK_WIRELESS_VLANIDTYPE	14988	27
MIKROTIK_WIRELESS_MINSIGNAL	14988	28
MIKROTIK_WIRELESS_MAXSIGNAL	14988	29

All Supported Attribute Numeric Values

Note: FreeRadius already has these attributes predefined. If you are using other radius server then use table below to create dictionary file

Name	VendorID	Value	RFC
Acct-Authentic		45	RFC 2866
Acct-Delay-Time		41	RFC 2866
Acct-Input-Gigawords		52	RFC 2869
Acct-Input-Octets		42	RFC 2866
Acct-Input-Packets		47	RFC 2866
Acct-Interim-Interval		85	RFC 2869
Acct-Output-Gigawords		53	RFC 2869
Acct-Output-Octets		43	RFC 2866
Acct-Output-Packets		48	RFC 2866
Acct-Session-Id		44	RFC 2866
Acct-Session-Time		46	RFC 2866
Acct-Status-Type		40	RFC 2866
Acct-Terminate-Cause		49	RFC 2866
Ascend-Client-Gateway	529	132
Ascend-Data-Rate	529	197
Ascend-Xmit-Rate	529	255
Called-Station-Id		30	RFC 2865
Calling-Station-Id		31	RFC 2865
CHAP-Challenge		60	RFC 2866
CHAP-Password		3	RFC 2865
Class		25	RFC 2865
Filter-Id		11	RFC 2865
Framed-Compression		53	RFC 2865
Framed-IP-Address		8	RFC 2865
Framed-IP-Netmask		9	RFC 2865
Framed-IPv6-Prefix		97	RFC 3162
Framed-Mtu		52	RFC 2869
Framed-Pool		88	RFC 2869
Framed-Protocol		7	RFC 2865
Framed-Route		22	RFC 2865
Framed-Routing		50	RFC 2865
Idle-Timeout		28	RFC 2865
MS-CHAP-Challenge	311	11	RFC 2548
MS-CHAP-Domain	311	10	RFC 2548
MS-CHAP-Response	311	1	RFC 2548
MS-CHAP2-Response	311	25	RFC 2548
MS-CHAP2-Success	311	26	RFC 2548
MS-MPPE-Encryption-Policy	311	7	RFC 2548
MS-MPPE-Encryption-Types	311	8	RFC 2548
MS-MPPE-Recv-Key	311	17	RFC 2548
MS-MPPE-Send-Key	311	16	RFC 2548
NAS-Identifier		32	RFC 2865
NAS-Port		5	RFC 2865
NAS-IP-Address		4	RFC 2865
NAS-Port-Id		87	RFC 2869
NAS-Port-Type		61	RFC 2865
Port-Limit		62	RFC 2865
Redback-Agent-Remote-Id	2352	96
Redback-Agent-Circuit-Id	2352	97
Service-Type		6	RFC 2865
Session-Timeout		27	RFC 2865
User-Name		1	RFC 2865
User-Password		2	RFC 2865
WISPr-Bandwidth-Max-Down	14122	8	wi-fi.org
WISPr-Bandwidth-Max-Up	14122	7	wi-fi.org
WISPr-Bandwidth-Min-Down	14122	6	wi-fi.org
WISPr-Bandwidth-Min-Up	14122	5	wi-fi.org
WISPr-Location-Id	14122	1	wi-fi.org
WISPr-Location-Name	14122	2	wi-fi.org
WISPr-Logoff-URL	14122	3	wi-fi.org
WISPr-Redirection-URL	14122	4	wi-fi.org
WISPr-Session-Terminate-Time	14122	9	wi-fi.org
WISPr-Session-Terminate-End-Of-Day	14122	10	wi-fi.org
WISPr-Billing-Class-Of-Service	14122	11	wi-fi.org

Troubleshooting

My radius server accepts authentication request from the client with "Auth: Login OK:...", but the user cannot log on. The bad replies counter is incrementing under radius monitor.

This situation can occur, if the radius client and server have high delay link between them. Try to increase the radius client's timeout to 600ms or more instead of the default 300ms! Also, double check, if the secrets match on client and server!

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