I have an Ubuntu box I wish to use as NAT instance (among other things). I would prefer to avoid using the NAT AMIs provided by Amazon, and instead configuring NAT myself.
Currently, my host has a single network interface (as shown in http://docs.amazonwebservices.com/AmazonVPC/latest/UserGuide/VPC_NAT_Instance.html ).
Should I be able to configure my Ubuntu host as the NAT instance for the other hosts in my Amazon network?
Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 5 454 MASQUERADE all -- * eth0 0.0.0.0/0 0.0.0.0/0
I tried configuring a NAT rule in the Ubuntu host (10.200.0.51). My second host is on a different network (10.200.10.41/24). So I wrote:
route add -net 10.200.0.0 netmask 255.255.255.0 dev eth0 # So I can reach 10.200.0.51 route add default gw 10.200.0.51
But the machine lost the connection.
What am I misunderstanding regading the usage of NAT instances and routing in Amazon?