From: Carlos G Mendioroz (tron@xxxxxxxxxxx)
Date: Tue Jun 18 2002 - 07:11:07 GMT-3
Try to understand why...
Router A knows that for going to 150.50.2.3 it has to dial 2000,
start ppp and there it goes.
Now Router B has the packet and has to reply. It needs to go to
150.50.2.2 and although it has a ppp link up with that address in
the other end, there is no map reflecting that. But it has a map
that says "talk to R2" but no way to dial :-(
(BTW, when you add the dial string to Router B, you will end up
with two ppp links up being used simplex, i.e., one way each)
What does authentication add ? That when authentication is in place,
Router B "knows" it is talking to R2 via that ppp link, so there is
no need to dial (also thanks to the "name" in the map).
HTH,
Ali Fahmi wrote:
>
> HI Baleegh,
> Thanks a lot it works right now once I added ppp
> authentication chap and username...,
> I think it's not recomendation, but...."mandatory" to put
> authentication since
> it made ip connectivity failed.
>
> rgds.
>
> Ali fahmi
>
> On Tue, 18 Jun 2002 08:01:51 +0500
> "Sahibzada Baleeghuddin Afridi" <baleegh@attglobal.net>
> wrote:
> > Ali,
> > Cisco recommends that you must use the authentication
> > while using ISDN. This
> > is one of the problem discussed in the power
> > session of Networkers 2000. you better go for the Chap
> > Authentication. Hope
> > it will solve you problem......
> >
> > Regards
> > Baleegh
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com
> > [mailto:nobody@groupstudy.com]On Behalf Of
> > Ali Fahmi
> > Sent: Tuesday, June 18, 2002 5:59 AM
> > To: ccielab@groupstudy.com
> > Subject: encap. failed on ISDN
> >
> >
> > hi All,
> > I have 2 routers connected via ISDN,
> > Router A
> > Int bri0
> > ip add 150.50.2.2 255.255.255.0
> > encapsulation ppp
> > dialer map ip 150.50.2.3 name R3 broadcast 2000
> > dialer-group 1
> > isdn switch-type basic-ni
> > isdn spid1 11110101
> >
> > dialer-list 1 protocol ip permit
> >
> > Router B
> >
> > Int Bri0
> > ip add 150.50.2.3 255.255.255.0
> > encapsulation ppp
> > dialer map ip 150.50.2.2 name R2 broadcast
> > dialer-group
> > isdn switch-type basic0ni
> > isdn spid1 22220101
> >
> > dialer-list 1 protocol ip permit
> >
> > -----
> >
> > The problem is, when I ping from Router A to B , the Bri0
> > can bring up and connected
> > properly but ping is not successfull,
> > I tried to debug ip packet on router B and found
> > "encapsulation failed"
> > but if I put string on router B (dialer map 150.50.2.2
> > name
> > R2 broadcast 1000)
> > ping is successfull,
> > anybody know what is suspected problem ?
> > thx
> >
> > Ali fahmi
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> >
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