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OPTIMAL MTU FOR VPN SYNOLOGY WINDOWS

Next, click the "Ethernet" tab and choose "Manually" from the "Configure" menu. Simply open the Network pane of System Preferences, and choose "Built-in Ethernet" from the "Show" pop-up tab (you may already be at this screen when you access the Network pane). If you have an Ethernet-based connection, setting the MTU is straightforward. MTU is measured in bytes, so a setting of "1600" would equal roughly 1.5 KB per packet.įor various reasons, setting the MTU at different levels can have a dramatic effect on your Internet access speed, so it's worth experimenting in order to determine what works best for your particular set-up.

OPTIMAL MTU FOR VPN SYNOLOGY WINDOWS

This enables support for concurrent L2TP/IPSec VPN connections on Windows through a shared public IP address (works on all versions from Windows XP to Windows 10).Network throughput is affected by myriad variables, one of them being the MTU (maximum transmission unit) packet size setting.Īs the name implies, MTU refers to the largest data packet that can be carried over your network pipe. Reg add "HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Rasman\Parameters" /v ProhibitIpSec /t REG_DWORD /d 0 /f Reg add "HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Rasman\Parameters" /v AllowL2TPWeakCrypto /t REG_DWORD /d 1 /f Run the following command to change apply these registry changes: ProhibitIPSec – change to 00000000 (enables IPsec encryption, which is often disabled by some VPN clients or system tools).AllowL2TPWeakCrypto – change to 00000001 (allows weak encryption algorithms, for L2TP/IPSec the MD5 and DES algorithms are used).To fix this bug, you need to change two registry parameters in the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan\Parameters registry key and restart your computer: You can easily connect to the VPN L2TP server from multiple devices at the same time.Īccording to TechNet, the issue is related to incorrect implementation of the L2TP/IPSec client on Windows (not fixed for many years). On Linux/MacOS/Android devices on the same local network, there are no such problems. Interestingly, this problem only occurs on Windows devices. Create a DWORD parameter with the name AssumeUDPEncapsulationContextOnSendRule and the value 2.Windows XP/Windows Server 2003 - HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IPSec.Windows 10/8.1/Vista and Windows Server 2016/2012R2/2008R2 - HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PolicyAgent.

Open the Registry Editor ( regedit.exe) and go to the following registry key:.

If the L2TP/IPsec VPN server is behind a NAT device, in order to connect external clients through NAT correctly, you have to make some changes to the registry both on the server and client side to allow UDP packet encapsulation for L2TP and NAT-T support in IPsec. NAT-T is enabled by default in almost all operating systems (iOS, Android, Linux) except Windows. You can fix this drawback by enabling support for the NAT-T protocol, which allows you to encapsulate ESP 50 packets in UDP packets on port 4500. If you want to use IPSec for communication, Microsoft recommends using public IP addresses on the VPN server.īut there is also a workaround. This is because IPsec uses ESP (Encapsulating Security Payload) to encrypt packets, and ESP doesn’t support PAT (Port Address Translation). The Windows built-in VPN client doesn’t support by default L2TP/IPsec connections through NAT. VPN Error 809 for L2TP/IPSec on Windows behind NATĪs it turned out, the problem is already known and described in the article.

If you connect to the same VPN server via PPTP, the connection is successfully established.