Can anyone please let me know How to configure freeRADIUS server so it replies with a CHAP "access-challenge" message on "access-request" from a client?
FreeRADIUS handles CHAP fine, so there's nothing to configure for the Access-Challenge part of the exchange. Configure your user in the users file (to begin with, and then later in the user directory/source of your choice, like a database or LDAP directory) and make sure you have a password set for it. To see which password obfuscation/encryption schemes work with which authentication scheme in RADIUS (not just FreeRADIUS), see http://deployingradius.com/documents/protocols/compatibility.html :-) Stefan Paetow Moonshot Industry & Research Liaison Coordinator t: +44 (0)1235 822 125 gpg: 0x3FCE5142 xmpp: stefanp@jabber.dev.ja.net skype: stefan.paetow.janet Lumen House, Library Avenue, Harwell Oxford, Didcot, OX11 0SG jisc.ac.uk Jisc is a registered charity (number 1149740) and a company limited by guarantee which is registered in England under Company No. 5747339, VAT No. GB 197 0632 86. Jisc’s registered office is: One Castlepark, Tower Hill, Bristol, BS2 0JA. T 0203 697 5800. Jisc Collections and Janet Ltd. is a wholly owned Jisc subsidiary and a company limited by guarantee which is registered in England under Company No. number 2881024, VAT No. GB 197 0632 86. The registered office is: Lumen House, Library Avenue, Harwell, Didcot, Oxfordshire, OX11 0SG. T 01235 822200.