Ping failure in VPN network

asked 2019-08-16 09:01:00 +0000

sugar76
9 ●3 ●5 ●8

updated 2019-08-16 09:05:51 +0000

Hello,

I have troubles connecting to a VPN network via IPSec.

The VPN is provided by the router in the remote network using DynDNS.

The connection is established succesfully (using Shrew Soft Client) I cannot connect to any device in the remote network. Even ping to the router fails.

You find the capture here: https://1drv.ms/u/s!AphLkdj_V9pOpidrc...

I see some TCP Retransmission pakets but I am not that familiar in reading captures.

Does the capture give any hints in what may be the problem?

answered 2019-08-20 01:34:02 +0000

Spooky

191 ●47 ●7 https://www.wireshark.org

Hi,

What the capture shows is that you are not receiving IP traffic at all from remote hosts.

You are seeing retransmission because your computer tries to connect to a remote host through TCP but the remote host does not answer so you computer keeps trying. These extra trials are seen as retransmission by Wireshark.

In VPN jargon, it looks like Phase 1 is up but Phase 2 is not working.

I would suggest you check remote router for any sort of policy configuration.

Somewhere you configure the allowed IP addresses or subnets for instance.

Hope this helps.

Cheers,

JFD

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OK thanks. I will check the router. Strange thing is that this behaviour only occurs sometimes. Often it simply works.

sugar76 ( 2019-08-20 07:11:31 +0000 )edit

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