From: Roy Dempsey (roy.dempsey@gmail.com)
Date: Fri Mar 11 2005 - 14:15:34 GMT-3
Hi Simon,
Had this EXACT problem yesterday. This should work, according to my
understanding. However, the only way I could get it to work is to add
the dialer string to the R5 router, thus breaking the requirement you
mention.
However, if you then go on and configure PPP encapsulation and
authentication on the interface, you can remove the dialer string.
I think its related to R5 not knowing what to do with the traffic,
even though there is only one configured interface and the debug shows
it being sent to this Interface. Once you configure authentication,
the router can map the traffic to the interface using the hostname of
the calling router
On Fri, 11 Mar 2005 17:02:28 -0000, simon hart
<simon.hart@btinternet.com> wrote:
> Hi all,
>
> I am having a bit of a nightmare with some simple ISDN configuration: I am
> trying to establish a connection between two routers R4 and R5. R5 should
> not be able to initiate a call - only R4. I am using legacy DDR, configs
> below
>
> Frame_R4#
> !
> interface BRI0
> ip address 187.1.45.4 255.255.255.0
> encapsulation ppp
> dialer map ip 187.1.45.5 name Rack1R5 broadcast 2222
> dialer-group 1
> isdn switch-type basic-ni
> isdn spid1 1211
> end
> !
> dialer-list 1 protocol ip permit
>
> Rack1R5#
> !
> interface BRI0/0
> ip address 187.1.45.5 255.255.255.0
> encapsulation ppp
> dialer idle-timeout 0
> dialer map ip 187.1.45.4 name Rack1R5 broadcast
> isdn switch-type basic-ni
> isdn spid1 2122
> end
>
> If I ping from Frame_R4 then the ISDN line is brought up but no response to
> the pings. If I debug IP packet on R5 I notice that I have an encapsulation
> failure:
> Rack1R5#
> *Mar 1 07:52:46.460: IP: s=187.1.45.4 (BRI0/0), d=187.1.45.5 (BRI0/0), len
> 100, rcvd 3
> *Mar 1 07:52:46.460: IP: s=187.1.45.5 (local), d=187.1.45.4 (BRI0/0), len
> 100, sending
> *Mar 1 07:52:46.460: IP: s=187.1.45.5 (local), d=187.1.45.4 (BRI0/0), len
> 100, encapsulation failed
> Rack1R5#
> *Mar 1 07:52:48.459: IP: s=187.1.45.4 (BRI0/0), d=187.1.45.5 (BRI0/0), len
> 100, rcvd 3
> *Mar 1 07:52:48.459: IP: s=187.1.45.5 (local), d=187.1.45.4 (BRI0/0), len
> 100, sending
> *Mar 1 07:52:48.463: IP: s=187.1.45.5 (local), d=187.1.45.4 (BRI0/0), len
> 100, encapsulation failed
>
> As you can see it is showing an encapsulation failure, however the map looks
> fine and the config is exactly as dictated within the solution guide of the
> Internetwork expert solution guide
>
> Any comments most welcome
>
> S.
>
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