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The RADIUS server does not deliver DNS IP lead to user cannot access the network

Publication Date:  2015-01-12 Views:  46 Downloads:  0
Issue Description

One user cannot obtain the DNS IP cause to cannot get online.

ME60 version: V600R006C00SPC300

Network topology: Radius- - - ME60 - - - IP backhaul - - - Switch- - - PPPOE router- - -end user

Handling Process

User cannot obtain the DNS IP possible reasons:

1.The path from the user to the ME60 does not reachable.

2. ME60 configuration problem.

3. Radius configuration problem.

Detailed analysis process:

1. To confirm with the user, the PC normal to obtain IP when cannot obtain DNS, so that the path from user to ME60 is normal.

 

2. To check ME60 configuration:

Domainxxx.xx.xx
Authentication, schemeabcdefg
Authorization - schemeabcdefg
Accounting - schemeabcdefg
IP - poolabcdefg
VPN - instancexxxxx: xxxxxx
Radius - server groupabcdefg

#
Dnsresolve
DNS server xxx.xxx.x.6
DNS server xxx.xxx.x.7
DNS server xxx.xx.xxx.170
DNS server xxx.xx.xxx.171
DNS server xx.xx.xxx.20
#

Radius - server groupabcdefg
Radius - server shared - key 123456 authenticationxxx.xxx.xxx.45 1645 weight0
Radius - server shared - key 123456 accountingxxx.xxx.xxx.45 1646 weight0

#
IP poolabcdefgbaslocal
VPN - instancexxxxx: xxxxxx
Exporthost - route
Gateway xxx.xxx.xxx.33 xxx.xxx.xxx.248
Section0xxx.xxx.xxx.34 xxx.xxx.xxx.39
Dns - server xxx.xxx.x.6 xxx.xxx.x.7
#
There are no exception about the ME60 configuration, and from the configuration we cannot confirm DNS IP is assigned by the ME60 or by Radius server.

 

3. To collect the interaction information on ME60 when the user PPPOE dialing.

<POCKETSHILL_BRAS>
POCKETSHILL _ BRASBTRC / / BTRC _ TraceInfo 7: [objectID = 1 ][slotID = 0 ] [ RADIUS ] [ userinfo.
MACAddress      : xxxx - xxxx - xxxx
IPAddress        . 255.255.255.255
Interface          . GigabitEthernet1 1/0 0.100
PEVLANID        . 100
USERNAME            : xxxxxxxx @ xxx.xx.xx ]
[traceinfo:
RadiusReceivedaPacket
ServerTemplate: 3
ServerIP    . xxx.xxx.xxx.45
VPN - Instance: -
ServerPort. 1645
NASPort      . 1812
Protocol: Standard
Code      : Authenticationaccept   //Radius authentication Response
Len        . 141
For          . 21
Service - Type (6)                                       ][ 6 ][ 2 ]
[ Framed - Protocol (The)                                 ][ 6 ][ 1 ]
[Class (25)                                                   ][ 39 ] [ BB - BUSINESS _ FASTER; xxxxxxxx @ xxx.xx.xx ]
[ Chargeable - User - Identity (89)             ][ 20 ][xxxxxxxx @ xxx.xx.xx ]
[Framed-IP - Address (s)                             ][ The ][xxx.xxx.xxx.21 ]     //RADIUS delivers user IP

[Framed-IP - Netmask (The)                             ][ 6 ][ 255.255.255.255.
[Framed-MTU (12)                                         ][ 6 ][ 1500.
[ Session - Timeout (27)                               ][ 6 ][ 100000.
[User-Name (1)                                             ][ 20 ][xxxxxxxx @ xxx.xx.xx
[ Acct - Interim, Interval (85)                   ][ 6 ][ 300 ]]


[ POCKETSHILL _ BRAS ] dis access-user mac-address xxxx - xxxx - xxxx
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Useraccessindex                         120193.
State                                                . Used
Username                                        : xxxxxxxx @ xxx.xx.xx
Domainname                                     xxx.xx.xx.
Userbackupedfrom                      : Local
Useraccessinterface                : GigabitEthernet1 / 0 / 0.100
UseraccessPeVlan and CeVlan        . 100 / -
Useraccessslot                          : 1
UserMAC                                          : xxxx - xxxx - xxxx
UserIPaddress                            . xxx.xxx.xxx.21 (RADIUS)
User gateway address                  . xxx.xxx.xxx.33
UserAuthenIPType                    : IPV4 / - and -
UserBasicIPType                      : - / - / -
UserMSIDSNname                          : -
EAPuser                                          : No
MD5 end                                            : No
MTU                                                     1492.
VPN - Instance                                  : xxxxx: xxxxx
Useraccesstype                          : PPPoE
Userauthenticationtype          . PPPauthentication
RADIUS - server template              . abcdefg

 

From the interactive information, The user address delivered by the Radius, and the Radius delivers user IP, no allots DNS IP address.

 

From the above information, Radius does not deliver DNS IP, and the third-party Radius check and confirm, no DNS configuration on Radius. After finish the configuration, user can obtain DNS IP and normal online.

Root Cause
Radius server configuration problem lead to not allots DNS IP for user.
Solution

Third-party Radius server vendor to check and add DNS related configuration.

Suggestions

Need to collect information:

END