12/27/2023 0 Comments Aws acl ephemeral portsSecurity Groups are an added capability in AWS that provides firewall-like. They purely filter based upon the content of the packet. Such routers are used to separate subnets and allow the creation of separate zones, such as a DMZ. I know that every VPC comes with a DNS server so as to route AWS DNS names to VMs. Network Access Control Lists (ACLs) mimic traditional firewalls implemented on hardware routers. What do I need to do to get the nginx resolver working when my network acl is applied?.It's important to note that if I allow all inbound traffic then the dns resolution works. I've tried adding 53 (UDP and TCP) into the inbound rules, but resolution still fails. In this post, I discuss a problem (and its solution) I encountered while working with AWS (Amazon Web Services) Network ACLs, docker containers and ephemeral port ranges. The network acl is setup to allow all outbound traffic for all protocols, but limits inbound traffic to a specific set of ports. About Posts Talks Writings and Trainings Categories Subscribe (RSS) AWS Network ACLs and ephemeral port ranges August 14, 2018. The nginx returns Bad Gateway responses complaining that my domain could not be resolved (110: Operation timed out). However, when I apply my network acl, everything works except for this dns resolution. Inbound and outbound ports are open in the subnet network ACL (ports 80 and 443 outbound and ephemeral. The IP is not static, so I have to do this. The nginx is set to proxy_pass to a domain name, and it's using an nginx resolver configuration: resolver 8.8.8.8 ipv6=off valid=10s to resolve that to an IP address. Traffic comes into the system on :443 to an ELB, which routes some of it to an nginx instance running on ECS, which proxy_pass-es it on to an external www address. I'm trying to lock down ports on my subnets, and am having a problem with an nginx instance that I'm running on ECS.
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