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We are currently hosting docker on an AWS EC2 but have run into a bit of network issue. We have multiple containers connected to a docker network bridge called NetBrig. I want to forward all traffic coming in on different AWS IPs across multiple network interfaces to private IPs on the network bridge like so

  • (AWS ELastic IP) --> 172.31.7.45 --> eth0 --> 172.20.0.11
  • (AWS ELastic IP) --> 172.31.7.46 --> eth0 --> 172.20.0.12
  • (AWS ELastic IP) --> 172.31.7.50 --> eth1 --> 172.20.0.13
  • (AWS ELastic IP) --> 172.31.7.51 --> eth1 --> 172.20.0.14

I am currently have no issues using DNAT rules below for the private IPs on eth0:

  • sudo iptables -I FORWARD -j ACCEPT
  • sudo iptables -t nat -A PREROUTING -d 172.31.7.45 -j DNAT --to-destination 172.20.0.11
  • sudo iptables -t nat -A PREROUTING -d 172.31.7.46 -j DNAT --to-destination 172.20.0.12
  • sudo iptables -t nat -A PREROUTING -d 172.31.7.50 -j DNAT --to-destination 172.20.0.13
  • sudo iptables -t nat -A PREROUTING -d 172.31.7.51 -j DNAT --to-destination 172.20.0.14

But the DNAT rules above do not seem to work for the private IPs across eth1. All my requests appear to time out. Does anyone have any suggestions?

Mark B
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