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VPN - Allow 2 or more PC connect same Public IP

Hi,

It's my firts Question...

I've XG330 (SFOS 17.0.8 MR-8).

I have multiple sites with 2 or 3 computers each headquarters, there is 1 Public IP in each location, and this PC's are connecting via L2TP, at the moment of connect first PC no problem, but second PC don't connect inclusive if the second PC have a user distinct.

The logviewer shows Traffic invalid, Bad UDP Checksum:

messageid="01001" log_type="Firewall" log_component="Invalid Traffic" log_subtype="Denied" status="Deny" con_duration="0" fw_rule_id="0" policy_type="0" user="" user_group="" web_policy_id="0" ips_policy_id="0" appfilter_policy_id="0" app_name="" app_risk="0" app_technology="" app_category="" in_interface="" out_interface="" src_mac="" src_ip="x.x.x.x" src_country="" dst_ip="x.x.x.x" dst_country="" protocol="UDP" src_port="49161" dst_port="4500" packets_sent="0" packets_received="0" bytes_sent="0" bytes_received="0" src_trans_ip="" src_trans_port="0" dst_trans_ip="" dst_trans_port="0" src_zone_type="" src_zone="" dst_zone_type="" dst_zone="" con_direction="" con_id="" virt_con_id="" hb_status="No Heartbeat" message="Bad UDP checksum." appresolvedby="Signature"

I had been Search for any solution, but only I had find this:
https://community.sophos.com/products/unified-threat-management/f/vpn-site-to-site-and-remote-access/55031/allow-multiple-users-connect-to-vpn-at-the-same-time-from-same-public-ip

I need that 2 or more PC are connected with L2TP.

How I make to the XG allow 2 or more PC connections L2TP with the same Public IP?

Please Help me, Thanks... regards...



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