From: Volodymyr Levytskyy (volodymyr.levytskyy@3web.net)
Date: Mon Sep 22 2003 - 20:47:58 GMT-3
Hi folks
Problem was on core side. No "dialer string #" and no ping!!!
But if you add authentication then it's working even without "dialer string
#" command.
How to be in case if you need only one side calling and other never must be
calling. Without authentication it's will never work??? (cause you can't
use "dialer string" or dialer map with #)
Thank to all!!
Volodymyr
----- Original Message -----
From: "Andriy Lysyuk" <lysyuk@ics.ua>
To: "'Jonathan V Hays'" <jhays@jtan.com>; "'Larry Roberts'"
<larryr@netbeam.net>; "'Volodymyr Levytskyy'"
<volodymyr.levytskyy@3web.net>; <ccielab@groupstudy.com>
Sent: Monday, September 22, 2003 1:22 AM
Subject: RE: isdn and authentication
> Hello.
>
> Authentication is required for successful two-way communication.
> Without authentication when receiving incoming call over any dial media
> (ISDN, POTS), peer trying to reply with ICMP echo reply. But after
> performing IP to dial number mapping receiving part is going to make
> another call, because it is unaware that call already active came from
> the same peer and router must not place another call.
> After auhentication is enabled receiving router is aware that active
> call originated from the same peer that sent ICMP request. So it simply
> send ISMP reply over existing channel.
>
> There is anohter interesting effect. When using two ISDN BRI interfaces
> with all necessary configuration on both sides for placing a call,
> without authentication two-way communication is performed by
> establishing 2 calls over separate B channels (one originated from party
> that initiated conneciton and another one originated from another
> party).
>
> Regards, Andrity Lysyuk
> CCIE #10933
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Jonathan V Hays
> Sent: Sunday, September 21, 2003 4:34 PM
> To: 'Larry Roberts'; 'Volodymyr Levytskyy'; ccielab@groupstudy.com
> Subject: RE: isdn and authentication
>
>
> In my experience neither PPP encapsulation nor a host route is needed to
> ping. See below:
>
> R1a#sh ip route | include 172.16.122.
> C 172.16.122.0/24 is directly connected, BRI1/0
> R1a#sh run int bri1/0
> Building configuration...
>
> Current configuration : 226 bytes
> !
> interface BRI1/0
> ip address 172.16.122.1 255.255.255.0
> encapsulation hdlc
> dialer map ip 172.16.122.2 name R2 broadcast 8358662
> dialer-group 1
> isdn switch-type basic-ni
> isdn spid1 0835866101
> isdn spid2 0835866301
> end
>
> R1a#ping 172.16.122.2
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 172.16.122.2, timeout is 2 seconds:
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 32/33/36 ms
> R1a#
>
> HTH,
>
> Jonathan
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Larry Roberts
> Sent: Sunday, September 21, 2003 3:52 AM
> To: Volodymyr Levytskyy; ccielab@groupstudy.com
> Subject: Re: isdn and authentication
>
>
> More than likely it is whenever you enable PPP you can ping the
> neighbor,
> not authentication. When you enable PPP encapsulation the router
> installs a
> /32 host route for the neighbor on the other side of the BRI link. It is
> the
> /32 route that enables you to ping the directly connected neighbor and
> yourself.
>
> HTH,
> Larry Roberts
> CCIE #7886 (R&S / Security)
>
>
> ----- Original Message -----
> From: "Volodymyr Levytskyy" <volodymyr.levytskyy@3web.net>
> To: <ccielab@groupstudy.com>
> Sent: Sunday, September 21, 2003 1:10 AM
> Subject: isdn and authentication
>
>
> > I am wondering why if is connected BRI to BRI without authentication
> there
> is
> > no ping on own interface or neighbor's, only when I enable
> authentication
> I
> > can ping these interfaces. Encapsulation ppp.
> >
> > Thanks
> > Volodymyr
> >
> > ***Get your CCIE and a FREE vacation: Shop.GroupStudy.com***
> >
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