OpenVPN Routing Issue – Unable to Access LAN Subnet (10.10.10.1)

NETWORKING SOLUTIONS
1
  1. Server Setup:
  • VPN Server IP: 172.16.1.1
  • Client Assigned VPN IP: 172.16.1.6
  • Client Local LAN IPs: 10.10.10.1 and 192.168.10.1
  1. Observed Behavior:
  • :white_check_mark: Works: Pinging 192.168.10.1 from the VPN server (172.16.1.1) succeeds.
  • :cross_mark: Fails: Pinging 10.10.10.1 from the VPN server drops with no response.
  • OpenVPN logs show:

MULTI: bad source address from client [10.10.1.1], packet dropped

  1. Troubleshooting Done:
  • Verified routes (ip route) on both server and client.
  • Added push "route 10.10.10.0 255.255.255.0" to server.conf.
  • Checked firewall rules (iptables)—no blocking rules found.
  • Temporarily disabled NAT (MASQUERADE) on the client, but the issue persists.

Server Side Rutx 50 directly connected with Static Public ip

Client Side OTD 500 With 5 G Sim

TLS Client Added and configured

Route Table of Rutx50
root@RUTX50:~# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 192.168.8.1 0.0.0.0 UG 1 0 0 eth1
172.16.1.0 172.16.1.2 255.255.255.0 UG 0 0 0 tun_s_1
172.16.1.2 * 255.255.255.255 UH 0 0 0 tun_s_1
172.16.1.6 * 255.255.255.255 UH 0 0 0 tun_s_1
192.168.8.0 * 255.255.255.0 U 1 0 0 eth1
192.168.10.0 * 255.255.255.0 U 0 0 0 br-lan
root@RUTX50:~#

3

Hello,

I’ve sent you a form to fill out so we can continue our conversation in private, to avoid accidentally leaking any sensitive information. In the Ticket ID field, simply enter the thread’s number, which is 14519.

Thank you,
M.