Hi, everyone, I would appreciate if you could help me.

Here is the network setup:

                         
-->E0-RouterA-S0<-->S0-RouterB-E0<-->Firewall<-->E0-RouterC-S0<--->Internet

The problem is that RouterA cannot access Internet. 
RouterB is configured with default route pointing to
the firewall's LAN interface, and it can get to the
Internet just fine. RouterA has default route pointing
to S0 on RouterB. RouterA can ping hosts on RouterB's
Ethernet subnet, but cannot ping Internet hosts. When
I try to trace Internet host from it, the trace stops
at the S0 interface on RouterB. The routing between A
and B is EIGRP, and it is working, because routers can
reach each other's Ethernet subnets. Firewall has all
the ports open. 

It seems to me that when packets addressed to Internet
from RouterA reach RouterB, RouterB does not know what
to do with them. How can I fix this?

Thank you.


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