ISP1 in Figure 4-28 has assigned the address block 201.50.13.0/24 to AS 3. ISP2 has assigned the address block 200.100.30.0/24 to AS 3. RTR1 and RTR2 are accepting full BGP routes from the ISP routers but do not transmit any routes to the ISPs. They run IBGP between them and OSPF on all Ethernet interfaces. No routes are redistributed between BGP and OSPF. The addresses of the router interfaces are as follows : RTR1, E0: 172.16.3.1/24 RTR1, E1: 172.16.2.1/24 RTR1, S0: 201.50.26.13/30 RTR2, E0: 172.16.3.2/24 RTR2, E1: 172.16.1.1/24 RTR2, S0: 200.100.29.241/30 SVR1 is the DNS server authoritative for AS 3; its address is 172.16.3.3. DNS1 reaches SVR1 at 201.50.13.1, whereas DNS2 reaches the same server at 200.100.30.254. Write routing and NAT configurations for RTR1 and RTR2, translating inside addresses appropriately for each ISP's assigned address block. Any inside device must be able to reach either ISP, but no packets can leave AS 3 with a private source address under any circumstance. ___________________________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ |