AWS VPN Gateway -VPC traffic routed through on prem firewall

Question

Hello All,

Vpn tunnels are established and SG and ACLS are opened but traffic from our vm towards internet is not going through , i see traffic on my on prem firewall and response as well but return traffic is getting dropped.

and when i try to ping internal resources , i ca ping but not to the internet, is my VPNGW dropping response from internet. VPC logs not showing return traffic.

Riku_Kobayashi · Accepted Answer

Hello.

It is highly unlikely that traffic will be blocked by AWS VGW.  
For example, if you set "Local IPv4 Network CIDR" or "Remote IPv4 Network CIDR" in the tunnel options, the CIDR that can pass through the VPN tunnel will be restricted, so if such settings are set, there is a possibility that communication will stop.  
https://docs.aws.amazon.com/vpn/latest/s2svpn/VPNTunnels.html

AWS VPN Gateway -VPC traffic routed through on prem firewall

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