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Old 11-05-2014, 04:55 AM   #1
Prime-Omega
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CentOS 6 PPTP VPN problems


Hello,

I bought a CentOS6 64x VPS server from Ramnode a while ago which I have been mainly using as a PPTP VPN server. I used following script/guide to configure this VPN: http://goo.gl/QjsgcC .

The problem that I am facing is that some websites are unreachable via the VPN connection. I am able to ping them however when I surf to them, I just get a blank page.

Please see following video which shows the problem:
http://www.screencast.com/t/IsDBNcS6RqD

This seems to be completely random, some websites work perfectly, some don't. ( always the same ones though )
I also installed a CLI browser (lynx) on my VPS and from there all websites are reachable.

So basically something must be going wrong between my PC and the VPS but I have no clue what. I am guessing some kind of routing/firewall/dns issue but I am unsure on how to proceed. I also tested from multiple locations and tried different browsers but to no avail.

Any help/advice would be greatly welcome!
 
Old 11-06-2014, 12:56 AM   #2
ferrari
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Quote:
The problem that I am facing is that some websites are unreachable via the VPN connection. I am able to ping them however when I surf to them, I just get a blank page.
Can you ping successfully by IP address and name? It would be useful to see code and output here (rather than screen capture).
For example

Also, when the VPN is active what is reported by
Code:
cat /etc/resolv.conf
Code:
netstat -r
 
Old 11-06-2014, 02:23 AM   #3
Prime-Omega
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Thanks for already having a look!

Code:
Can you ping successfully by IP address and name? It would be useful to see code and output here (rather than screen capture).
Yes pinging works from both Windows and my VPS. I am using www.hln.be as an example because that site is never reachable via my browser.

Windows:
C:\Users\Mathieu.vandelook>ping www.hln.be

Pinging e8838.ksd.akamaiedge.net [23.212.205.150] with 32 bytes of data:
Reply from 23.212.205.150: bytes=32 time=37ms TTL=57
Reply from 23.212.205.150: bytes=32 time=36ms TTL=57
Reply from 23.212.205.150: bytes=32 time=38ms TTL=57
Reply from 23.212.205.150: bytes=32 time=46ms TTL=57

Ping statistics for 23.212.205.150:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 36ms, Maximum = 46ms, Average = 39ms

C:\Users\Mathieu.vandelook>nslookup www.hln.be
Server: google-public-dns-a.google.com
Address: 8.8.8.8

Non-authoritative answer:
Name: e8838.ksd.akamaiedge.net
Address: 23.212.205.150
Aliases: www.hln.be
ssl-be.persgroep.edgekey.net

C:\Users\Mathieu.vandelook>ping 23.212.205.150

Pinging 23.212.205.150 with 32 bytes of data:
Reply from 23.212.205.150: bytes=32 time=38ms TTL=57
Reply from 23.212.205.150: bytes=32 time=36ms TTL=57
Reply from 23.212.205.150: bytes=32 time=35ms TTL=57
Reply from 23.212.205.150: bytes=32 time=36ms TTL=57

Ping statistics for 23.212.205.150:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 35ms, Maximum = 38ms, Average = 36ms

VPS:
[root@grover ~]# ping www.hln.be
PING e8838.ksd.akamaiedge.net (23.212.205.150) 56(84) bytes of data.
64 bytes from a23-212-205-150.deploy.static.akamaitechnologies.com (23.212.205.150): icmp_seq=1 ttl=57 time=2.35 ms
64 bytes from a23-212-205-150.deploy.static.akamaitechnologies.com (23.212.205.150): icmp_seq=2 ttl=57 time=2.35 ms
64 bytes from a23-212-205-150.deploy.static.akamaitechnologies.com (23.212.205.150): icmp_seq=3 ttl=57 time=2.46 ms
64 bytes from a23-212-205-150.deploy.static.akamaitechnologies.com (23.212.205.150): icmp_seq=4 ttl=57 time=2.24 ms

[root@grover ~]# ping 23.212.205.150
PING 23.212.205.150 (23.212.205.150) 56(84) bytes of data.
64 bytes from 23.212.205.150: icmp_seq=1 ttl=57 time=2.34 ms
64 bytes from 23.212.205.150: icmp_seq=2 ttl=57 time=2.30 ms
64 bytes from 23.212.205.150: icmp_seq=3 ttl=57 time=2.46 ms
64 bytes from 23.212.205.150: icmp_seq=4 ttl=57 time=2.22 ms

Code:
cat /etc/resolv.conf
[root@grover ~]# cat /etc/resolv.conf
nameserver 8.8.8.8
nameserver 8.8.4.4


Code:
netstat -r
[root@grover ~]# netstat -r
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.0.151 * 255.255.255.255 UH 0 0 0 ppp0
link-local * 255.255.0.0 U 0 0 0 venet0
default * 0.0.0.0 U 0 0 0 venet0

Code:
Windows ipconfig
PPP adapter Grover:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Grover
Physical Address. . . . . . . . . :
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 192.168.0.151(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . : 0.0.0.0
DNS Servers . . . . . . . . . . . : 8.8.8.8
8.8.4.4
NetBIOS over Tcpip. . . . . . . . : Enabled

Last edited by Prime-Omega; 11-06-2014 at 02:33 AM.
 
Old 11-13-2014, 06:29 AM   #4
Prime-Omega
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Anyone any suggestions/ideas?
 
Old 11-26-2014, 09:46 AM   #5
Prime-Omega
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Bump! Still having this problem unfortunately...
 
Old 11-30-2014, 02:23 AM   #6
ferrari
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I can't help directly, but I can point you at this

https://www.privateinternetaccess.co...ile-vpn-active

You might need to research this further outside of these forums. I only ever use my (PPTP) VPN for accessing company servers, not for internet access.
 
Old 12-03-2014, 05:50 AM   #7
Prime-Omega
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Hello,

Small update, was not able to find a proper fix for this unfortunately.

In the meantime, I have setup a small PPTP server at home for VPN usage.
I do not have the mentioned problems with my setup at home so I will probably cancel other VPN subscription.

Topic may be closed.

Cheers,
Mathieu
 
  


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