tcp/ip settings for vpn

TCP/IP Settings for VPN

Why does my VPN server or client PPP adapter have 169.x.x.x IP
Why my XP VPN client's subnet mask is 255.255.255.255
Why my XP VPN client's IP is the same as default gateway IP
Unable to contact a DHCP server - Event ID 20169

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Why does my VPN server or client PPP adapter have 169.x.x.x IP

When using ipconfig command on a VPN (server or client), you may get PPP adapter RAS Server (Dial In) Interface; IP Address - 169.x.x.x; Subnet Mask - 255.255.255.255. This is because your VPN server doesn't have DHCP to assign IP so that the the VPN server uses APIPA to provides an address like 169.x.x.x.

Why my XP VPN client's subnet mask is 255.255.255.255

This is by design. Since this connection is point to point, not point to net or net to net, VPN server assigns 255.255.255.255 mask to the client.

Why my XP VPN client's IP is the same as default gateway IP

This is by design. Since this connection is point to point, VPN server assigns the same IP to VPN client and client's gateway.

Unable to contact a DHCP server - Event ID 20169

Causes: 1. You don't have DHCP server.
2. The RRAS server can't contact to the DHCP.
3. The DHCP is out of the IP
4. The RRAS doesn't assign IP to the VPN client.