How to connect to outside world from amazon vpc?

Question

I have amazon VPC set through wizard as \"public only network\", so all my instances are in public subnet.

Instances within VPC that have Elastic IP assigned connect

Answer 1

This works for me with :

• VPC subnet 172.20.0.0/16
• EC2 "nat" gateway 172.20.10.10 with EIP

To do :

• Set disabled source/dest. check on your "nat gw"
• create a new "nat-sub" subnet ex: 172.20.222.0/24
• modify route 0.0.0.0/0 to 172.20.10.10 (my nat gw) for "nat-sub"
• create a EC2 using "nat-sub"
• on your nat gateway as root, try :

root@gw:~# sysctl -q -w net.ipv4.ip_forward=1 net.ipv4.conf.eth0.send_redirects=0

root@gw:~# iptables -t nat -C POSTROUTING -o eth0 -s 172.20.222.0/24 -j MASQUERADE 2> /dev/null || iptables -t nat -A POSTROUTING -o eth0 -s 172.20.222.0/24 -j MASQUERADE

if it works, add this 2 lines in /etc/rc.local