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[2x Cisco RV220W] Site-2-site VPN works only in one direction?

Hello everyone!

For the purpose of a remote backup between 2 QNAP NAS devices, I have setup a site to site VPN using 2 Cisco RV220W routers. Although VPN connects just fine, I can only access Network B from network A, but not the other way around. I believe it could be related to ip ranges/subnets, but since I am no expert, I thought I'd ask here!

here's what I have so far:

Network A:

  • Hardware: Cisco RV220W
  • VPN Type: IPSec
  • Router IP: 192.168.8.1
  • Router subnet: 255.255.255.0
  • Router DHCP: 192.168.8.100 - 192.168.8.254
  • QNAP fixed IP: 192.168.8.3

Network B:

  • Hardware: Cisco RV220W
  • VPN Type: IPSec
  • Router IP: 192.168.3.1
  • Router subnet: 255.255.255.128
  • Router DHCP: 192.168.3.100 - 192.168.3.120
  • QNAP fixed IP: 192.168.3.3

Status:

  • IPSec VPN connects successfully (IPSec SA Established)
  • From network A I can connect to any device on network B (qnap smb, ssh, cisco web interface, printer, laptops, etc)
  • From network B, I can ping any device on network A, I can access the cisco web interface from network A, and nothing else. If I try to access the web interface for the qnap on network A from a device in network B, no luck, it seems to hang. I also tried issuing a wget command from the qnap (ssh) on network B to fetch the web interface of the qnap on network A, and it says connected, but then hangs.

I've tried lots of different settings (creating static routes, dynamic routes, changing subnets, etc), but without any luck.

I really hope you guys and girls have the answer for me! If you need any more info, please ask!

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