ppp chap refuse
ppp chap refuse [callin]
no ppp chap refuse [callin]
callin (Optional) This keyword specifies that the router will refuse to answer CHAP authentication challenges received from the peer, but will still require the peer to answer any CHAP challenges the router sends.
To refuse Challenge Handshake Authentication Protocol (CHAP) authentication from peers requesting it, use the ppp chap refuse command in interface configuration mode. To allow CHAP authentication, use the no form of this command.
This command specifies that CHAP authentication is disabled for all calls, meaning that all attempts by the peer to force the user to authenticate using CHAP will be refused. If the callin keyword is used, CHAP authentication is disabled for incoming calls from the peer, but will still be performed on outgoing calls to the peer.
If outbound Password Authentication Protocol (PAP) has been enabled (using the ppp pap sent-username command), PAP will be suggested as the authentication method in the refusal packet.
The following example specifies ISDN BRI number 0. The method of encapsulation on the interface is PPP. This example disables CHAP authentication from occurring if a peer calls in requesting CHAP authentication.Router(config)#interface bri 0 Router(config-if)#encapsulation ppp Router(config-if)#ppp chap refuse
aaa authentication ppp
ppp chap hostname
ppp chap password
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