ppp authentication chap pap callin or pap chap on my Dialer interface?

Answered Question
Oct 17th, 2007

Does it make a difference which order the authentication is in if I have both the pap and chap user name s and passwords applied to the same interface? Should I have pap first of chap first? Here is my current setup:

DSL modem --> Ethernet0

vpdn enable

vpdn ip udp ignore checksum


vpdn-group pppoe


protocol pppoe

interface Ethernet0

no ip address

ip virtual-reassembly


pppoe enable

pppoe-client dial-pool-number 1

no cdp enable

interface Dialer0

ip address *.*.*.169

ip access-group 102 in

ip mtu 1492

ip inspect FIREWALL out

ip nat outside

ip virtual-reassembly

encapsulation ppp

no ip route-cache cef

no ip route-cache

no ip mroute-cache

dialer pool 1

dialer-group 1

ppp authentication chap pap callin

ppp chap hostname [email protected]

ppp chap password 7 ********************

ppp pap sent-username [email protected] password 7 ******************

crypto map rdln_map

Thanks for any helps!

I have this problem too.
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Correct Answer by Paolo Bevilacqua about 8 years 12 months ago

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Overall Rating: 4 (1 ratings)
Paolo Bevilacqua Wed, 10/17/2007 - 15:00

No it doesn't matter. With both PAP and CHAP credentials configured, whatever the ISP uses, you have, so it's ok.


- you don't need the vpdn statements, the docs referencing that are old.

- suggest you re-enable ip route cache cef

- reconfig mtu to default of 1500 and test "ping x.x.x. df size 1500", chances are it will work

- add "ppp ipcp route default" and "ppp ipcp dns request" to remove need of configure these separately.

hope this helps, please rate post if it does!

Correct Answer
Paolo Bevilacqua Wed, 10/17/2007 - 15:49

You are very welcome. Please remember to rate useful posts using the scrollbox below!


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