Hoi ve ip default-net de ra Internet

[zai911]

Minh co mo hinh nhu sau:
R1(10.0.12.1)---(10.0.12.2)R2(172.16.23.2)-----(172.16.23.3)R3

R2 co loopback 2.2.2.2
R3 co loopback 3.3.3.3

Mo hinh chay RP EIGRP nhu sau:
R1 cho int 10.0.12.1 tham gia
R2 cho int 10.0.12.2 va 172.16.23.2 tham gia (2.2.2.2 ko tham zai EIGRP)

Tai R2 dung lenh ip default-network 172.16.0.0

==> R1 xuat hien D* tai route 172.16.0.0
Quay lai R2 cau hinh nat de co the ping toi 3.3.3.3 nhu sau
access-list 1 permit any
ip nat inside source list 1 int s1/3 overload
Vao int s1/3(noi voi R3)
ip nat outside
Vao int s1/2 (noi R2)
ip nat inside
Tai R2:
Ping 3.3.3.3 router bao: .....
Tai R1
ping 3.3.3.3 router bao: U.U.U
Theo minh nghi:
R1 ko thay dc mang 3.0.0.0 mac du co default route (ip default-network) nhung ko co Gateway of last Resort
R2 thi bi host unreachable chang ?
The la the nao cac bac ?

Hoi tiep ========>
Sang R2, danh cau lenh ip route 0.0.0.0 0.0.0.0 172.16.34.4
Tai R2: ping 3.3.3.3 ----> ok
tai R1: ping 3.3.3.3-----> ok
The la the nao ?