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DDR not working

Greetings to all readers,

I recently implemented dialin RAS with Cisco 2811 pvdm2-36DM E1 with VPDN and Radius.

I also want to configura dial on demand on same device for 300 remote locations.

I tried to do that with Dialer interfaces but ping works sometimes, sometimes it doesnt work and I'm quite confused :|

Here's an example of my dialer interface

interface Dialer2

ip unnumbered Loopback2

encapsulation ppp

dialer remote-name REMOTE-NAME

dialer idle-timeout 900

dialer string XXXXXXX

dialer-group 1

no cdp enable

ppp authentication pap

ppp pap sent-username USERNAME password 0 PASSWORD

end

When I try to ping that location I sometimes get:

C:\Documents and Settings\admin>ping REMOTE-NAME

Pinging REMOTE-NAME [192.16.1.1] with 32 bytes of data:

Reply from 192.16.1.1: bytes=32 time=461ms TTL=124

Reply from 192.16.1.1: bytes=32 time=75ms TTL=124

Reply from 192.16.1.1: bytes=32 time=71ms TTL=124

Reply from 192.16.1.1: bytes=32 time=74ms TTL=124

and the next time I get:

C:\Documents and Settings\admin>ping -n 100 REMOTE-NAME

Pinging 192.16.1.1 with 32 bytes of data:

Reply from 78.3.112.38: Destination host unreachable.

Request timed out.

Reply from 78.3.112.38: Destination host unreachable.

Request timed out.

Reply from 78.3.112.38: Destination host unreachable.

Request timed out.

Reply from 78.3.112.38: Destination host unreachable.

Request timed out.

Reply from 78.3.112.38: Destination host unreachable.

Request timed out.

Any suggestion would be highly appreciated. My show run/sh ver/sh modem ver is in attachment.

Kind regards,

Valentin

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