ATM dialer

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Hi, I've got the below config for an ATM interface.  What I don't understand
is why it actually works!  I've got no dialer-group/dialer-list combo, why
does the dialer interface come up without having any interesting traffic
associated with it?   I do have a static route eg "ip route 0.0.0.0 0.0.0.0
d2" but I don't see why that overcomes the need to have interesting traffic
specified.  Can anyone explain to me?

Regards
Paul

#sh run int d2
Building configuration...

Current configuration : 231 bytes
!
interface Dialer2
 bandwidth 1126
 ip address negotiated
 ip nat outside
 encapsulation ppp
 dialer pool 2
 ppp authentication chap callin
 ppp chap hostname <removed>
 ppp chap password 7 <removed>
end




Re: ATM dialer



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Must admit I'm not competent on dialer setups but haven't you answered your
own question. Surely a default route pointing to the dialer is interesting
traffic as long as no better route exists in the routing table.

Toby



Re: ATM dialer


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Thanks for the reply Toby. I just didn't thank that's how they work. I
thought you *had* to define interesting traffic to bring a dialer interface
up, and that's with a dialer-list. ah well.



Re: ATM dialer


John Smith wrote:
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Ya know...it's been a long time, but I'm pretty sure dialer-list is
required to kick up the line.

--

hsb


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Re: ATM dialer



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that's what I thought, but if the above config doesn't work then you
wouldn't be getting this email!!!



Re: ATM dialer


On Tue, 15 Mar 2005 20:23:21 -0000, "John Smith"

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I am not an expert on this but when you say its an ATM interface then
you must be using PPP over ATM for some sort of DSL connection.

What is the config on the main interface. Is it something like

interface atm 1/0
   no ip address
 !
 interface atm1/0.1 point-to-point
   pvc 0/100
   encapsulation aal5snap
   protocol ppp dialer
   dialer pool-member 2

If this is the case then ATM has no concept of interesting traffic.
This is only used in ISDN and DDR. Like frame relay ATM uses permanent
virtual circuits (PVC) and is an always on technology. With ATM you
can also define switched virtual circuits (SVC) which go up and down
as needed but as far as I know all types of traffic will bring the
connection up and there is no way of defining "interesting traffic"

Beez


Re: ATM dialer


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Thanks Beez - I'd assumed that interesting traffic was a fundamental propery
of dialler interfaces, irrespective of what type of intereface it ended up
at.

Ta,
Paul



Re: ATM dialer


On Thu, 17 Mar 2005 18:51:39 -0000, "John Smith"

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Not sure if it is right what I said. I think I have to do more reading
on the subject. I wonder if anyone can clear it up who knows more
about it.

I checked the Cisco documentation  and they give some examples of
PPPoE and PPPoA configurations

They give 3 examples

PPP over Ethernet with NAT
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_fix/826/swg/netscene.htm#1066251
PPP over Ethernet with NAT Using a Dial-on-Demand PPP-over- Ethernet
Connection
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_fix/826/swg/netscene.htm#1066428
PPP over ATM with NAT
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_fix/826/swg/netscene.htm#1015545

The first 2 have dialer-group/list defined and the last does not. Only
difference I can see is first 2 are PPPoE and last is PPPoA.

Hope someone can clear it up for me.

Beez

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