From: Christopher J Dosch (chrisdosch@xxxxxxxxxxxxxxx)
Date: Sun Aug 05 2001 - 08:34:48 GMT-3
To make sure only one side initiates the call just designate the protocol as
uninteresting using the dialer-list command. Basic config below, router-6
can call router-5 but router-5 cannot call router-6. Once the call is
placed router-5 can send traffic over the line. Notice there is no
authentication at all, it's not needed. The reason you were receiving the
"encapsulation failed" message is you had no layer-2 to layer-3 mapping.
Chris
Router-5
interface BRI0
ip address 10.1.35.5 255.255.255.252
encapsulation ppp
isdn spid1 81049306240101 4930624
isdn spid2 81049306250101 4930625
dialer map ip 10.1.35.6 name Router-6 broadcast 4930622
dialer-group 1
dialer-list 1 protocol ip deny
Router-6
interface BRI0
ip address 10.1.35.6 255.255.255.252
encapsulation ppp
isdn spid1 81049306220101 4930622
isdn spid2 81049306230101 4930623
dialer map ip 10.1.35.5 name Router-5 broadcast 4930624
dialer-group 1
dialer-list 1 protocol ip permit
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Rodgers Moore
Sent: Saturday, August 04, 2001 11:48 PM
To: adiment@uswest.com
Cc: roberto.omori@bol.com.br; ccielab@groupstudy.com
Subject: Re: ISDN encapsulation Failed
There is another way too. Remove the dailer-map completely, and let the
router
build the map dynamically. This way you don't have to have authentication
on
the side without a dial string.
Rodgers Moore
adiment@uswest.com wrote:
> I would guess you are not using authentication. This same problem has
> happened to me. I found out in the CCIE power session at networkers that
> the routers still need to resolve where to send the packets in the
> dialer-map statement. Either using a dial string or authentication. If
one
> side does not have a dial string you need authentication to resolve it.
>
> -----Original Message-----
> From: Roberto Omori [mailto:roberto.omori@bol.com.br]
> Sent: Wednesday, August 01, 2001 1:24 PM
> To: ccielab@groupstudy.com
> Subject: ISDN encapsulation Failed
>
> Hi all,
>
> To allow only one side to make the call the basic idea is omit the dial
> string
> isnt it? Well, I have experienced the following problem:
>
> 1-If I config. the strings on both sides I can ping both routers.
>
> 2-If I config. only one side, it dials, the connection is established but
I
> cannot ping the remote router.
>
> Debugging ip packets, it presents an "encapsulation failed" message.
>
> Has anyone experienced this problem?
> **Please read:http://www.groupstudy.com/list/posting.html
> **Please read:http://www.groupstudy.com/list/posting.html
**Please read:http://www.groupstudy.com/list/posting.html
**Please read:http://www.groupstudy.com/list/posting.html
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