This is the first time I've tried to setup the AWS VPN attached to a transit gateway. I've tested using openswan and it worked like a charm. But the issue is now I am trying to set it up for our premise network which is behind a NAT device. I am trying to comprehend why the tunnel are still down and the network people from the onpremise side are not helping much (they said they've configured the customer gateway and that's it) .
Basically they have given me a CIDR range (/30) to where I need to NAT first all traffics before routing them to onprem and with that CIDR range I could not even create a subnet (invalid CIDR range for the subnet). I have also gotten the static routes which I've added to the transit gateway routes.
Is there a way to NAT traffic from a VPC to a specific network (AWS side in my case to 10.x.x.x/30) before sending the traffic over the tunnel to onpremise. I could not find a way to setup that up.
And also the onpremise network people are not helping much since they said they've setup everything on their side and waiting for me to bring the tunnel up. Is there something am I missing, in my previous AWS VPN setup, the initiator to bring the tunnel was always from the customer gateway side.
/palmer
In this case the vpn will be always initiate from the on premise side for completion.
you need to prepare a cgw and create a s2s vpn connection with those cgw and share the config information s2s with your on premise colleague .
Also for nat in vpc you can use the nat gateway for one way nat.
Related
I am trying to connect to an RDS Instance from my local machine through a VPC Peering connection. In my AWS Account I have two VPCs: VPC1 is connected to my local network via DirectConnect, VPC2 isn't. VPC2 contains all of my infrastructure and the idea is that if I want to connect to that infrastructure from my local machine I need to work through VPC1.
I have configured a route in the peering connection to forward IP based requests to VPC2 for a given address range. This doesn't really help me for RDS though because I don't know what the IP Address for RDS is, only the endpoint. I am guessing that there is some combination of DNS/Routing/Networking/Peering that will solve this problem but I haven't found any documentation that describes how to solve this issue.
Has anyone solved this issue before, or know of any documentation that describes what needs to be done?
Update:
The exact problem is that I can't connect to the RDS instance from my local machine. For example, if I use the RDS Endpoint as the server for my connection, the Sql Client I am using simply can't connect with a timeout error. My suspicion is that traffic is not being routed to VPC2 correctly but I don't know how to prove that.
As far as DNS goes, I am not sure how OnPrem is setup however I have 4 hosted zones in Route53 with a variety of URLs. Items that I setup in Route53 I am able to resolve by host name on my local.
Likewise, I am not sure how the network has been configured with DirectConnect (full VPN tunnel or otherwise).
As far as DNS and the network connections between AWS go though, that stuff works. I am able to resolve pieces of infrastructure in VPC1 fine I just (seemingly) can't get traffic to move across the Peering Connection in the way that I would expect.
I think the problem is that you think you can access vpc2 resources from on-prem just b/c you have direct connect to vpc1. What vpc-peering is giving you is access from vpc1 to vpc2 via private ip addresses. In your case you want vpc1 to act like a router to just transit your request from on-prem to vpc2. It does not work that way.
What are your options:
You could have a host vpc1 access vpc2 (like a bastion host) and you could ssh into that one first.
If possible, you can create a vpn connection from on-prem to vpc2.
And there are more complex solutions via transit gateway.
The doc here talks about vpc-peering limitations, it will basically explain that transitive connections like you want won't work: https://docs.aws.amazon.com/vpc/latest/peering/vpc-peering-basics.html
AWS scenario documentation to reach db mentions option 1 here: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_VPC.Scenarios.html
Sorry for the Japanese material.
I think VPC1 and VPC2 cannot communicate even if you configure routing. So as long as communication is impossible, configuring DNS will not accomplish the goal, I guess.
AWS Solutions Architect ブログ: VPC Peeringの使いどころとTips等々
VPC Peering provides peering, not routing between multiple VPCs, so if you are peering 3 or more VPCs or connecting to locations outside of AWS via VPN or DirectConnect, even if you set the Routing Table appropriately for each, there will be no IP layer routing to networks more than 2 hops away. Even if you configure the Routing Table appropriately, there will be no IP layer routing to networks more than 2 hops away. Workarounds such as using proxies or stepping stones are required as before.
Translated with www.DeepL.com/Translator (free version)
Could PrivateLink help you achieve your goal?
AWS-40_AWS_Summit_Online_2020_NET01.pdf
Along the example on page 42:
local network --> Direct Connect --> VPC Endpoint (in VPC1) --> NLB (in VPC2) --> RDS (in VPC2)
I've created a javascript lambda function that is triggered by an API gateway request. I've tested it from my frontend and it works fine (hosted outside AWS).
However, from my function I need to call an HTTP service from my on-prem network as an API call. I've tested the service through a local VPN connection in my machine and it works like a charm. Reading through the AWS documentation, I reached to the conclusion that I needed to configure my lambda to run inside a VPC and to connect that VPC to a site-to-site VPN.
I created the site-to-site VPN and the tunnels are up without issues. I created the client gateway for my on-prem network and also a Virtual Private Gateway for my AWS network. I checked the box to propagate to the routing table the on-prem IP prefixes I declared while creating the VPN. (I understand the IP prefixes are the on-prem IP endpoints I need to reach. For example let's say my services are hosted in 172.31.0.2 and 172.31.15.22, so I declared them as /32 since they're a single IP address and AWS asked me for a CIDR.)
I also created my VPC, associated it to the VPN and declared a subnet. The network admin gave me a CIDR range as routing option for our AWS services (let's say 172.31.50.160/29) so I declared the VPC CIDR as 172.21.0.0/16 and the subnet as 172.31.50.160/28. I also made sure lambda configurations specified my newly created VPC and subnet as well a security group.
While my frontend can still call the lambda without problems, I can't seem to reach the on-prem network. I always receive an ENOTFOUND error, so I assume this means the API call isn't going through the VPN tunnel, as the service is only reachable through the tunnel. So I'm guessing it's most likely a routing error. However, I'm not sure how to solve it.
My routing table shows the propagated IPs and the Virtual Private Gateway as their destination, as well as the 172.31.0.0/16 with the destination as Local. I imagine it could be a routing error, maybe I made a mistake setting that CIDR range as the VPC range.
I also tried adding cloudwatch logging to the VPC to check the traffic but nothing is logged, it always comes up empty. I made sure the IAM role I used for this had cloudwatch permissions, thinking that might be the issue, but even after that the logs are empty.
As you can see I have only very basic knowledge about networks, so any help is appreciated!
TL;DR
Goal: To allow my lambda function to access an on-prem service in a local machine.
Expected results: After connecting the lambda to a VPC that's associated to a running VPN, my lambda would be able to reach the local machine.
Actual results: The lambda is unable to locate the local machine (getaddrinfo ENOTFOUND error), seems as if the traffic is not going through the VPN tunnel.
Turns out that the same way that lambda cannot directly access the internet without a public NAT gateway and the right routing, lambda cannot access on-prem machines through the VPN without a private NAT gateway.
So I created a private subnet in my VPC, using the CIDR range the on-prem network administrator gave me. Then I routed my requests to the on-prem machines to the private NAT gateway. The routing table for this private subnet directed my traffic flow to the Virtual Private Gateway and in this way I was able to reach the on-prem machines.
Summary
Create a private subnet in your VPC (do not associate it to lambda)
Create a private NAT gateway and associate it with your new subnet
On the route table that manages the subnets associated with lambda, route your requests to the on-prem machines to the private NAT gateway you created on step 2
On the private NAT's routing table, route requests to your Virtual Private Gateway associated with your VPN
And done, you should be able to send HTTP requests from your lambda to your on-prem servers.
I have a setup with a couple of services running in ECS (separate frontends and backends). And now I have the requirement that outbound requests from the backends to some third part APIs needs to have an static (elastic) IP.
As I'm quite the novice with networking I've been following this guide, for basically routing requests to given IP-addresses through the NAT.
Setup:
One VPC
3 subnets (2 for ECS services, the third for the NAT) - All public(?)
Application load balancers for the services.
Routing to the load balancers through Route53.
The way I've been testing it is to either route all traffic, or traffic to my local IP, in the main routing table through the NAT gateway instead of the internet gateway directly. And in both cases, when I try to access either a frontend or server it never responds. And I don't see any traffic in the monitoring-tab for the NAT either. If I just route the traffic directly to the IGW from the main routing table it obviously still work.
So I'd really appreciate some help here since I'm not sure if it's my setup that's not compatible with the above solution, I'm doing something wrong of just overlooking something.
Edit: Did the sensible thing, as pointed out, and placed the services in private subnets.
If you have all your ECS tasks in the public subnet, how are you going to mask all of them behind the NAT? Even my cat knows this.
I am trying to connect to a private server running on a windows machine from my AWS Lambda. The goal is to get some data from that server in the Lambda and work with it.
I've created a site-to-site VPN connection with that private server and the tunnels are up. I've put my lambda on the VPC that is connected to the site-to-site VPN. But still I can't connect to the server.
Can anyone please give me any resource or suggest the steps on how I should actually do it?
I've followed the following steps:
Created a VPC with a CIDR.
Created a private subnet from that VPC (let's say it's named subnet-1)
Added a site-to-site VPN, connected it to the private server and attached the VPC to the VPN connection.
Created a Lambda within the subnet-1.
Tried to ping the private server, but failed.
I'm not providing any code or any screenshot as this might make this question too long
Update: The issue is solved. I had a wrong configuration in the router table. After fixing that, it worked.
There are several things that can cause the connectivity to fail:
Are there NACLs that prevents the traffic from flowing outside of the subnet?
Is the lambda armed with a security group that allows passage towards the windows server?
Is the VPN fully working at the time of testing?
Are there any network firewalls on the on-premise network that prevents the traffic from the lambda to flow?
Do the CIDRs of the VPC collide with the CIDRs of the on-premise network?
I would usually assign compatible subnets between my VPC and on-premise site to make this work.
UPDATE: As per question's author, he faced router table related issue that prevents propagation of traffic between on-premise and AWS-based network.
These are the questions that I tend to ask when running into this problems but there could be other things that can cause your issue. Hope these checks help.
I am looking to find a way to communicate between 2 VPCs in AWS without the use of VPN connections to and from a certain company (outside AWS) - so that the traffic does not pass through the company's gateway. Or, simply said, access an EC2 instance in a VPC from another VPC (both in AWS) without leaving the Amazon Network (not going out on the internet, not even encrypted).
Basically what I want to do is to have a VPC acting as a "proxy" (let's call it PROX) and one acting as a "target" (called TARG). Now I want to connect a company through VPC to the PROX and inside the PROX route the requests to the TARG. Is this achievable? I would go for a traditional public-private single VPC, but I was asked to look into the previously described "architecture".
Use two Linux machines as VPN GW, each in each VPC.
Configure IPsec VPN between them.
That's all you need
This is not possible. You have to use a VPN connection between the two VPCs. You can directly connect them though relatively easily using the pair of IPSec gateways though. This is the recommended method of cross-connecting VPC's across regions.