NAT will not work if the interface you are overloading to is not in an up/up status. Under your serial interfaces, you have keepalives turned off... be sure that those serial lines are actually up and that traffic can traverse those links.
I solved the problem using a loopback and configuring "ip unnumbered" in the Virtual-template interface. About your question: traffic does go trough the serial interfaces but the NAT traffic. The problem was that the Virtual-template interface is always down/down and, as you say, we can't do NAT with that kind of interface.
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...