10-28-2008 02:33 PM - edited 03-04-2019 12:06 AM
Hey guys!! Can someone one here point me to a doc or send me a config example of a c880 on DSL or cable modem? I would totally like to plagiarize your working config hahaha
thanks in advance!
10-28-2008 02:53 PM
Hello Brent,
first info with PPPoE is not DHCP but IPCP that assigns an IP address to your router
second in CCO there are a lot of examples
for example:
Hope to help
Giuseppe
10-30-2008 09:33 AM
10-30-2008 10:06 AM
Hello Brent,
as for PPP authentication you can:
a) use a username password command in global config mode
OR
b) inside the dialer interface use the ppp chap username e ppp chap password or ppp chap sent-password (not sure about the command syntax but the idea is this)
you can debug the PPP process setup with
terminal monitor
debug ppp negotiation
debug ppp authentication
Hope to help
Giuseppe
10-30-2008 10:24 AM
yes see that's what I thought and this is what's confusing me...
when I go under the dialer1 interface all I see is this
BLKLANSTR01(config-if)#ppp chap ?
hostname Set alternate CHAP hostname
password Set default CHAP password
refuse Refuse to authenticate using CHAP
wait Wait for caller to authenticate first
and when i go further like under hostname and so on I don't see anything that implies a "username and password" to be used for pppoe authentication. So I'm thinking I must be in the wrong place. Very strange this 880 is.
10-30-2008 12:18 PM
I think I have it I would like some confirmation
the dialer interface below is set to callin and use the username:bleh@businessisp.ca and the password:blaahaa
correct? Or do I have what "hostname" means wrong?
interface Dialer1
description outside
ip address pp.pp.pp.pp 255.255.255.0
ip access-group ACL-INBOUND in
ip nat outside
ip inspect ipins out
ip virtual-reassembly
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication chap callin
ppp chap hostname bleh@businessisp.ca
ppp chap password 0 blaahaa
end
10-30-2008 12:49 PM
Hello Brent,
actually with ppp hostname you specify how your router presents itself to the PPP peer.
ppp chap hostname
To create a pool of dialup routers that all appear to be the same host when authenticating with Challenge Handshake Authentication Protocol (CHAP), use the ppp chap hostname command in interface configuration mode. To disable this function, use the no form of this command.
ppp chap hostname hostname
no ppp chap hostname hostname
Syntax Description
hostname
The name sent in the CHAP challenge.
So the commands look like correct and you need to use the parameters that your ISP has given you.
hostname: because the PPP authentication appears between two routers the default name is the router hostname.
And the username password command in global config is used to define the other router's hostname and password is the same (but this is bidirectional authentication that happens on both side)
So actually this is the correct way to configure CHAP on an ISP connection where the caller (your router is authenticated) ppp authentication chap callin
Hope to help
Giuseppe
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