printer offline while connecting vpn

today I configure 7 branch using forticlient vpn client in to allow them connect to our HQ application server .In firewall I already configure slit tunneling for my SSL vpn. But have two branch is call me back while they connect the forticlient the their local printer is turn to offline and unable to go internet.

After they feedback I go there check what going on then  I found that their gateway and DNS server is same with my HQ firewall LAN IP:192.168.1.254 after that I manually configure 8.8.8.8 for the DNS then the able to browse internet.

Please advice what do I need to do to resolve printer offline and DNS issue .
YaYangTeahAsked:
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JohnBusiness Consultant (Owner)Commented:
I found that their gateway and DNS server is same with my HQ firewall LAN IP:192.168.1.254  <-- You need to put the remote users on a different subnet. You cannot use the same subnet for two ends of a VPN connection.

I use IPsec VPN with Split Tunneling and my local internet and printers work fine.

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YaYangTeahAuthor Commented:
Why sll other branch no problem but the different is their gateway is 192.168.1.1.Please advice. Thanks
JohnBusiness Consultant (Owner)Commented:
As I noted, you are say both locations use the 192.168.1.x subnet. This does not work for VPN and you need to change one end to a different subnet.
YaYangTeahAuthor Commented:
In fact, another 5 branch with the same subnet with my hq is working fine but their gateway is using 192.168.1.1.
JohnBusiness Consultant (Owner)Commented:
VPN has always required different subnets and that is at the root of your issue.
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