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Event ID: 20126 Source: IPRouterManager

A packet from <source ip address> destined to <destination ip address> over protocol <protocol number> caused interface <interface type> to be brought up. The first <number of bytes> bytes of the packet are in the data.
0000: 5a 42 01 85 98 e3 aa 68   ZB.??h
0008: 00 00 00 00 70 02 22 38   ....p."8
0010: ff 49 00 00 02 04 05 b4   I.....
In my case I fixed the problem by uninstalling and reinstalling RRAS.
The <protocol number> field indicates the type of protocol that caused the event:
0x01 (decimal 1) = ICMP
0x06 (decimal 6) = TCP
0x11 (decimal 17) = UDP

This event in itself is not an indication of a problem. It simply records the fact that a Dial on Demand (DoD) interface has been brought up as there was traffic from the local to the remote network (for which the DoD has been configured). Some users reported this event as occuring when there were problems with the RRAS server. This could be because the DoD would keep trying to reconnect (but failing for whatever reason).
If you need to investigate what is causing the DoD see this comment (from a newsgroup):
"Under IP Routing\General\Properties\Logging set logging to Maximum. In the
Event log you will see the entries that correspond to the traffic that
triggered the event. Use this and netmon to help pin point the traffic. Then
use IP Filters and Demand Dial Filters to solve the problem."

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