boson Sequencial Lab15 NAT and PAT..

boson Sequencial Lab15 NAT and PAT..

How come I can telnet from router 2 to router 3 but I can NOT telnet from router 1 to router 3?

router 2 <=> router 1 <=> router 3

router1#telnet 175.10.1.2
Trying 175.10.1.2 ...
% Destination unreachable; gateway or host down
router1#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default
U - per-user static route

Gateway of last resort is not set

175.10.0.0/24 is subnetted, 1 subnets
C 175.10.1.0 is directly connected, Serial0
160.10.0.0/24 is subnetted, 1 subnets
C 160.10.1.0 is directly connected, Ethernet0
O 197.10.1.0 [110/128] via 175.10.1.3, 00:35:10, Serial0
180.10.0.0/24 is subnetted, 1 subnets
O 180.10.1.0 [110/192] via 175.10.1.2, 00:23:40, Serial0
O 195.10.1.0 [110/192] via 175.10.1.2, 00:13:10, Serial0

router1#sh ip int brief
Interface IP-Address OK? Method Status Protocol
Serial0 175.10.1.1 YES unset up up
Serial1 unassigned YES unset down down
Ethernet0 160.10.1.1 YES unset up up
Bri0 unassigned YES unset up up
Bri0:1 unassigned YES unset down down
Bri0:2 unassigned YES unset down down


Thank you for helpping:)