Problems with a virtual private network

[laredotornado]

Hi,

Can someone tell me how I can begin to troubleshoot this problem? Both
my colleague and I are connected to the same VPN. There is a server
within this configuration with local (private) IP 192.168.0.60. My
colleague can ping the server fine, but I cannot (my requests
repeatedly time out) although my Internet is otherwise working
normally. This is what I get when I run "ipconfig" from cmd:

Ethernet Adapter Local Area Connection:

Connection-specific DNS Suffix: : abcd.co.comcast.net
IP Address: : 192.168.0.100
Subnet Mask: : 255.255.255.0
Default Gateway: : 192.168.0.1

Ethernet Adapter Wireless Network Connection:

Media State : Media
disconnected

PPP Adapter (what I named VPN network):

Connection-specific DNS Suffix: :
IP Address: : 192.168.0.121
Subnet Mask: : 255.255.255.255
Default Gateway: : 192.168.0.121


This is my colleague's ipconfig output while connected to the same VPN:

Ethernet Adapter Local Area Connection:

Media State : Media
disconnected

Ethernet Adapter Wireless Network Connection:

Connection-specific DNS Suffix: : austin.rr.com
IP Address: : 192.168.15.104
Subnet Mask: : 255.255.255.0
Default Gateway: : 192.168.15.1


PPP Adapter (what she named VPN network):

Connection-specific DNS Suffix: :
IP Address: : 192.168.0.152
Subnet Mask: : 255.255.255.255
Default Gateway: : 192.168.0.152


Thanks for any advice, - Dave

 

[Robert L [MVP - Networking]]

This is a good case. It doesn't work for you because you are using the same IP range as the VPN. These search results may help,

Resolution for VPN server and client using the same IP range
Resolution for VPN server and client using the same IP range. Q1: if both (VPN Client and server) locations have same ip e.g: 192.168.1.0/ , we can't change ...
www.chicagotech.net/Q&A/vpn49.htm

Both VPN sites are in the same IP range
Q: Both sites are in the same IP range ... Related Topics. VPN server and client are using the same IP but in different subnets · VPN Browsing Issues ...
www.chicagotech.net/Q&A/vpn20.htm

Solution for peer to peer VPN using the same IP
Case Study - Both VPN sites are using the same IP range ... Since he is using the same IP range of the office LAN, any traffics to 192.168.0.x from the VPN ...
www.chicagotech.net/casestudy/peervpn1.htm

Cannot access resources after establishing VPN
Case Study - Both VPN sites are using the same IP range ... Since he is using the same IP range of ... Both sites use the same IP range on a VPN connection. ...
www.chicagotech.net/casestudy/vpnsameip1.htm


Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
Hi,

Can someone tell me how I can begin to troubleshoot this problem? Both
my colleague and I are connected to the same VPN. There is a server
within this configuration with local (private) IP 192.168.0.60. My
colleague can ping the server fine, but I cannot (my requests
repeatedly time out) although my Internet is otherwise working
normally. This is what I get when I run "ipconfig" from cmd:

Ethernet Adapter Local Area Connection:

Connection-specific DNS Suffix: : abcd.co.comcast.net
IP Address: : 192.168.0.100
Subnet Mask: : 255.255.255.0
Default Gateway: : 192.168.0.1

Ethernet Adapter Wireless Network Connection:

Media State : Media
disconnected

PPP Adapter (what I named VPN network):

Connection-specific DNS Suffix: :
IP Address: : 192.168.0.121
Subnet Mask: : 255.255.255.255
Default Gateway: : 192.168.0.121


This is my colleague's ipconfig output while connected to the same VPN:

Ethernet Adapter Local Area Connection:

Media State : Media
disconnected

Ethernet Adapter Wireless Network Connection:

Connection-specific DNS Suffix: : austin.rr.com
IP Address: : 192.168.15.104
Subnet Mask: : 255.255.255.0
Default Gateway: : 192.168.15.1


PPP Adapter (what she named VPN network):

Connection-specific DNS Suffix: :
IP Address: : 192.168.0.152
Subnet Mask: : 255.255.255.255
Default Gateway: : 192.168.0.152


Thanks for any advice, - Dave

 

[Yves Leclerc]

The "classic" VPN routing problem.

Server IP: 192.168.0.60

Colleague's working system IP: 192.168.15.104
-- His system can route the requests correctly to the
server since the "home" network is on a different network (182.168.15.xxx).

Your IP: 192.168.0.100
Your PC can not determine where to route the server
requests: Your network IPs are the exact same IP structure as the server
(192.168.0.xxx.) All traffic is sent first thru your local IP network and
this network can not find the requested server (192.168.0.60) or can not
resolve the ping requests.

Two possible solutions:

1) Change your own "home" IP address structure to something else than
192.168.0.xxx (server) or 192.168.15.xxx (colleague.)

2) Change the server IP IP address structure to something else than
192.168.0.xxx (you) or 192.168.15.xxx (colleague.)

You want a different IP address network between your, your colleague and the
server:

Example:

Colleague: 192.168.15.104
Server: 192.168.0.60 (or 192.168.254.60)
You: 192.168.16.100 (or 192.168.0.100)