Hi
Paul has provided the information about the network changes required. Between the routers you need to use: A) a dynamic routing protocol or B) a static routing.
As you mentioned the first router 1841 is working fine, so you should have something like that on your routers, also check if the interface between these routers are UP. Please remember the ping is reciprocal so it works on both ways if a icmp packet go to a destination the destination must know how to reach the source.
This is just an example, because I dont know about you IP plan:
ROUTER 1
int fa0/0
description INTERNET
ip add 1.1.1.2 255.255.255.252
ip nat outside
no shutdown
int fa0/1
description TO-ROUTER-2
ip add 172.16.1.1 255.255.255.252
ip nat inside
no shutdown
ip access-list standard PRIVATE-NETWORKS <--- your internal networks
permit 192.168.0.0 0.0.0.255
permit 192.168.1.0 0.0.0.255
permit 192.168.2.0 0.0.0.255
ip nat inside source list PRIVATE-NETWORKS interface g0/0 overload
ip route 0.0.0.0 0.0.0.0 1.1.1.1 <---- a static default route
* One way to advertise a default route through EIGRP is using redistribution static.
router eigrp 100
no auto-summary
redistribute static metric 10000 10 255 1 1500
network 0.0.0.0 255.255.255.255 <-- it is optional, I use it to advertise all networks directly connected but you can make it like in R2
Other way is sending a summarized network:
int fa0/1
description TO-ROUTER-2
ip add 172.16.1.1 255.255.255.252
Ip summary-address eigrp 100 0.0.0.0 0.0.0.0
ip nat inside
no shutdown
ROUTER2
int fa0/1
description TO-ROUTER-2
ip add 172.16.1.2 255.255.255.252
no shutdown
int fa0/0
no shutdown
int fa0/0.10
encapsulation dot1q 10
ip add 192.168.0.1 255.255.255.0
int fa0/0.20
encapsulation dot1q 20
ip add 192.168.1.1 255.255.255.0
int fa0/0.30
encapsulation dot1q 30
ip add 192.168.2.1 255.255.255.0
router eigrp 100
no auto-summary
network 172.16.1.0 0.0.0.3
network 192.168.0.0 0.0.0.255
network 192.168.1.0 0.0.0.255
network 192.168.2 0.0.0.0.255
This router should receive a default route from Router 1, you should see an entry on the routing table for the 0.0.0.0
sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override
Gateway of last resort is 172.16.1.1 to network 0.0.0.0
D* 0.0.0.0/0 [90/307200] via 172.16.1.1, 00:00:04 <--- using summary-address
Now if you are redistributing the default route on R1 you will something like that on R2 through show ip route:
D*EX 0.0.0.0/0 [170/284160] via 172.16.1.1, 00:00:05,
The first entry example has an administrative distance of 90 because it is generated by EIGRP and the second entry example has a AD of 170 because it is assumed as learned by a external protocol
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